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Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull core locking updates from Ingo Molnar:
 "The main changes in this cycle are:

   - Another attempt at enabling cross-release lockdep dependency
     tracking (automatically part of CONFIG_PROVE_LOCKING=y), this time
     with better performance and fewer false positives. (Byungchul Park)

   - Introduce lockdep_assert_irqs_enabled()/disabled() and convert
     open-coded equivalents to lockdep variants. (Frederic Weisbecker)

   - Add down_read_killable() and use it in the VFS's iterate_dir()
     method. (Kirill Tkhai)

   - Convert remaining uses of ACCESS_ONCE() to
     READ_ONCE()/WRITE_ONCE(). Most of the conversion was Coccinelle
     driven. (Mark Rutland, Paul E. McKenney)

   - Get rid of lockless_dereference(), by strengthening Alpha atomics,
     strengthening READ_ONCE() with smp_read_barrier_depends() and thus
     being able to convert users of lockless_dereference() to
     READ_ONCE(). (Will Deacon)

   - Various micro-optimizations:

        - better PV qspinlocks (Waiman Long),
        - better x86 barriers (Michael S. Tsirkin)
        - better x86 refcounts (Kees Cook)

   - ... plus other fixes and enhancements. (Borislav Petkov, Juergen
     Gross, Miguel Bernal Marin)"

* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (70 commits)
  locking/x86: Use LOCK ADD for smp_mb() instead of MFENCE
  rcu: Use lockdep to assert IRQs are disabled/enabled
  netpoll: Use lockdep to assert IRQs are disabled/enabled
  timers/posix-cpu-timers: Use lockdep to assert IRQs are disabled/enabled
  sched/clock, sched/cputime: Use lockdep to assert IRQs are disabled/enabled
  irq_work: Use lockdep to assert IRQs are disabled/enabled
  irq/timings: Use lockdep to assert IRQs are disabled/enabled
  perf/core: Use lockdep to assert IRQs are disabled/enabled
  x86: Use lockdep to assert IRQs are disabled/enabled
  smp/core: Use lockdep to assert IRQs are disabled/enabled
  timers/hrtimer: Use lockdep to assert IRQs are disabled/enabled
  timers/nohz: Use lockdep to assert IRQs are disabled/enabled
  workqueue: Use lockdep to assert IRQs are disabled/enabled
  irq/softirqs: Use lockdep to assert IRQs are disabled/enabled
  locking/lockdep: Add IRQs disabled/enabled assertion APIs: lockdep_assert_irqs_enabled()/disabled()
  locking/pvqspinlock: Implement hybrid PV queued/unfair locks
  locking/rwlocks: Fix comments
  x86/paravirt: Set up the virt_spin_lock_key after static keys get initialized
  block, locking/lockdep: Assign a lock_class per gendisk used for wait_for_completion()
  workqueue: Remove now redundant lock acquisitions wrt. workqueue flushes
  ...
This commit is contained in:
Linus Torvalds 2017-11-13 12:38:26 -08:00
Родитель 6098850e7e 450cbdd012
Коммит 8e9a2dba86
307 изменённых файлов: 1252 добавлений и 1672 удалений
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3
Documentation/admin-guide/kernel-parameters.txt
Просмотреть файл

@ -709,6 +709,9 @@
It will be ignored when crashkernel=X,high is not used
or memory reserved is below 4G.
crossrelease_fullstack
[KNL] Allow to record full stack trace in cross-release
cryptomgr.notests
[KNL] Disable crypto self-tests

6
Documentation/filesystems/path-lookup.md
Просмотреть файл

@ -826,9 +826,9 @@ If the filesystem may need to revalidate dcache entries, then
*is* passed the dentry but does not have access to the `inode` or the
`seq` number from the `nameidata`, so it needs to be extra careful
when accessing fields in the dentry. This "extra care" typically
involves using `ACCESS_ONCE()` or the newer [`READ_ONCE()`] to access
fields, and verifying the result is not NULL before using it. This
pattern can be see in `nfs_lookup_revalidate()`.
involves using [`READ_ONCE()`] to access fields, and verifying the
result is not NULL before using it. This pattern can be seen in
`nfs_lookup_revalidate()`.
A pair of patterns
------------------

12
Documentation/memory-barriers.txt
Просмотреть файл

@ -1880,18 +1880,6 @@ There are some more advanced barrier functions:
See Documentation/atomic_{t,bitops}.txt for more information.
(*) lockless_dereference();
This can be thought of as a pointer-fetch wrapper around the
smp_read_barrier_depends() data-dependency barrier.
This is also similar to rcu_dereference(), but in cases where
object lifetime is handled by some mechanism other than RCU, for
example, when the objects removed only when the system goes down.
In addition, lockless_dereference() is used in some data structures
that can be used both with and without RCU.
(*) dma_wmb();
(*) dma_rmb();

12
Documentation/translations/ko_KR/memory-barriers.txt
Просмотреть файл

@ -1858,18 +1858,6 @@ Mandatory 배리어들은 SMP 시스템에서도 UP 시스템에서도 SMP 효
참고하세요.
(*) lockless_dereference();
이 함수는 smp_read_barrier_depends() 데이터 의존성 배리어를 사용하는
포인터 읽어오기 래퍼(wrapper) 함수로 생각될 수 있습니다.
객체의 라이프타임이 RCU 외의 메커니즘으로 관리된다는 점을 제외하면
rcu_dereference() 와도 유사한데, 예를 들면 객체가 시스템이 꺼질 때에만
제거되는 경우 등입니다. 또한, lockless_dereference() 은 RCU 와 함께
사용될수도, RCU 없이 사용될 수도 있는 일부 데이터 구조에 사용되고
있습니다.
(*) dma_wmb();
(*) dma_rmb();

13
arch/alpha/include/asm/atomic.h
Просмотреть файл

@ -14,6 +14,15 @@
* than regular operations.
*/
/*
* To ensure dependency ordering is preserved for the _relaxed and
* _release atomics, an smp_read_barrier_depends() is unconditionally
* inserted into the _relaxed variants, which are used to build the
* barriered versions. To avoid redundant back-to-back fences, we can
* define the _acquire and _fence versions explicitly.
*/
#define __atomic_op_acquire(op, args...) op##_relaxed(args)
#define __atomic_op_fence __atomic_op_release
#define ATOMIC_INIT(i) { (i) }
#define ATOMIC64_INIT(i) { (i) }
@ -61,6 +70,7 @@ static inline int atomic_##op##_return_relaxed(int i, atomic_t *v) \
".previous" \
:"=&r" (temp), "=m" (v->counter), "=&r" (result) \
:"Ir" (i), "m" (v->counter) : "memory"); \
smp_read_barrier_depends(); \
return result; \
}
@ -78,6 +88,7 @@ static inline int atomic_fetch_##op##_relaxed(int i, atomic_t *v) \
".previous" \
:"=&r" (temp), "=m" (v->counter), "=&r" (result) \
:"Ir" (i), "m" (v->counter) : "memory"); \
smp_read_barrier_depends(); \
return result; \
}
@ -112,6 +123,7 @@ static __inline__ long atomic64_##op##_return_relaxed(long i, atomic64_t * v) \
".previous" \
:"=&r" (temp), "=m" (v->counter), "=&r" (result) \
:"Ir" (i), "m" (v->counter) : "memory"); \
smp_read_barrier_depends(); \
return result; \
}
@ -129,6 +141,7 @@ static __inline__ long atomic64_fetch_##op##_relaxed(long i, atomic64_t * v) \
".previous" \
:"=&r" (temp), "=m" (v->counter), "=&r" (result) \
:"Ir" (i), "m" (v->counter) : "memory"); \
smp_read_barrier_depends(); \
return result; \
}

21
arch/alpha/include/asm/rwsem.h
Просмотреть файл

@ -22,7 +22,7 @@
#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
static inline void __down_read(struct rw_semaphore *sem)
static inline int ___down_read(struct rw_semaphore *sem)
{
long oldcount;
#ifndef CONFIG_SMP
@ -42,10 +42,24 @@ static inline void __down_read(struct rw_semaphore *sem)
:"=&r" (oldcount), "=m" (sem->count), "=&r" (temp)
:"Ir" (RWSEM_ACTIVE_READ_BIAS), "m" (sem->count) : "memory");
#endif
if (unlikely(oldcount < 0))
return (oldcount < 0);
}
static inline void __down_read(struct rw_semaphore *sem)
{
if (unlikely(___down_read(sem)))
rwsem_down_read_failed(sem);
}
static inline int __down_read_killable(struct rw_semaphore *sem)
{
if (unlikely(___down_read(sem)))
if (IS_ERR(rwsem_down_read_failed_killable(sem)))
return -EINTR;
return 0;
}
/*
* trylock for reading -- returns 1 if successful, 0 if contention
*/
@ -95,9 +109,10 @@ static inline void __down_write(struct rw_semaphore *sem)
static inline int __down_write_killable(struct rw_semaphore *sem)
{
if (unlikely(___down_write(sem)))
if (unlikely(___down_write(sem))) {
if (IS_ERR(rwsem_down_write_failed_killable(sem)))
return -EINTR;
}
return 0;
}

14
arch/alpha/include/asm/spinlock.h
Просмотреть файл

@ -14,7 +14,6 @@
* We make no fairness assumptions. They have a cost.
*/
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
#define arch_spin_is_locked(x) ((x)->lock != 0)
static inline int arch_spin_value_unlocked(arch_spinlock_t lock)
@ -55,16 +54,6 @@ static inline int arch_spin_trylock(arch_spinlock_t *lock)
/***********************************************************/
static inline int arch_read_can_lock(arch_rwlock_t *lock)
{
return (lock->lock & 1) == 0;
}
static inline int arch_write_can_lock(arch_rwlock_t *lock)
{
return lock->lock == 0;
}
static inline void arch_read_lock(arch_rwlock_t *lock)
{
long regx;
@ -171,7 +160,4 @@ static inline void arch_write_unlock(arch_rwlock_t * lock)
lock->lock = 0;
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#endif /* _ALPHA_SPINLOCK_H */

11
arch/arc/include/asm/spinlock.h
Просмотреть файл

@ -14,7 +14,6 @@
#include <asm/barrier.h>
#define arch_spin_is_locked(x) ((x)->slock != __ARCH_SPIN_LOCK_UNLOCKED__)
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
#ifdef CONFIG_ARC_HAS_LLSC
@ -410,14 +409,4 @@ static inline void arch_write_unlock(arch_rwlock_t *rw)
#endif
#define arch_read_can_lock(x) ((x)->counter > 0)
#define arch_write_can_lock(x) ((x)->counter == __ARCH_RW_LOCK_UNLOCKED__)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SPINLOCK_H */

2
arch/arc/kernel/smp.c
Просмотреть файл

@ -250,7 +250,7 @@ static void ipi_send_msg_one(int cpu, enum ipi_msg_type msg)
* and read back old value
*/
do {
new = old = ACCESS_ONCE(*ipi_data_ptr);
new = old = READ_ONCE(*ipi_data_ptr);
new |= 1U << msg;
} while (cmpxchg(ipi_data_ptr, old, new) != old);

3
arch/arm/include/asm/ptrace.h
Просмотреть файл

@ -126,8 +126,7 @@ extern unsigned long profile_pc(struct pt_regs *regs);
/*
* kprobe-based event tracer support
*/
#include <linux/stddef.h>
#include <linux/types.h>
#include <linux/compiler.h>
#define MAX_REG_OFFSET (offsetof(struct pt_regs, ARM_ORIG_r0))
extern int regs_query_register_offset(const char *name);

17
arch/arm/include/asm/spinlock.h
Просмотреть файл

@ -53,8 +53,6 @@ static inline void dsb_sev(void)
* memory.
*/
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
static inline void arch_spin_lock(arch_spinlock_t *lock)
{
unsigned long tmp;
@ -74,7 +72,7 @@ static inline void arch_spin_lock(arch_spinlock_t *lock)
while (lockval.tickets.next != lockval.tickets.owner) {
wfe();
lockval.tickets.owner = ACCESS_ONCE(lock->tickets.owner);
lockval.tickets.owner = READ_ONCE(lock->tickets.owner);
}
smp_mb();
@ -194,9 +192,6 @@ static inline void arch_write_unlock(arch_rwlock_t *rw)
dsb_sev();
}
/* write_can_lock - would write_trylock() succeed? */
#define arch_write_can_lock(x) (ACCESS_ONCE((x)->lock) == 0)
/*
* Read locks are a bit more hairy:
* - Exclusively load the lock value.
@ -274,14 +269,4 @@ static inline int arch_read_trylock(arch_rwlock_t *rw)
}
}
/* read_can_lock - would read_trylock() succeed? */
#define arch_read_can_lock(x) (ACCESS_ONCE((x)->lock) < 0x80000000)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SPINLOCK_H */

2
arch/arm/mach-tegra/cpuidle-tegra20.c
Просмотреть файл

@ -179,7 +179,7 @@ static int tegra20_idle_lp2_coupled(struct cpuidle_device *dev,
bool entered_lp2 = false;
if (tegra_pending_sgi())
ACCESS_ONCE(abort_flag) = true;
WRITE_ONCE(abort_flag, true);
cpuidle_coupled_parallel_barrier(dev, &abort_barrier);

2
arch/arm/vdso/vgettimeofday.c
Просмотреть файл

@ -35,7 +35,7 @@ static notrace u32 __vdso_read_begin(const struct vdso_data *vdata)
{
u32 seq;
repeat:
seq = ACCESS_ONCE(vdata->seq_count);
seq = READ_ONCE(vdata->seq_count);
if (seq & 1) {
cpu_relax();
goto repeat;

17
arch/arm64/Kconfig
Просмотреть файл

@ -22,7 +22,24 @@ config ARM64
select ARCH_HAS_STRICT_MODULE_RWX
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAVE_NMI_SAFE_CMPXCHG if ACPI_APEI_SEA
select ARCH_INLINE_READ_LOCK if !PREEMPT
select ARCH_INLINE_READ_LOCK_BH if !PREEMPT
select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPT
select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPT
select ARCH_INLINE_READ_UNLOCK if !PREEMPT
select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPT
select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPT
select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPT
select ARCH_INLINE_WRITE_LOCK if !PREEMPT
select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPT
select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPT
select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPT
select ARCH_INLINE_WRITE_UNLOCK if !PREEMPT
select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPT
select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPT
select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPT
select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_USE_QUEUED_RWLOCKS
select ARCH_SUPPORTS_MEMORY_FAILURE
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_SUPPORTS_NUMA_BALANCING

1
arch/arm64/include/asm/Kbuild
Просмотреть файл

@ -16,6 +16,7 @@ generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
generic-y += msi.h
generic-y += preempt.h
generic-y += qrwlock.h
generic-y += rwsem.h
generic-y += segment.h
generic-y += serial.h

173
arch/arm64/include/asm/spinlock.h
Просмотреть файл

@ -27,8 +27,6 @@
* instructions.
*/
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
static inline void arch_spin_lock(arch_spinlock_t *lock)
{
unsigned int tmp;
@ -139,176 +137,7 @@ static inline int arch_spin_is_contended(arch_spinlock_t *lock)
}
#define arch_spin_is_contended arch_spin_is_contended
/*
* Write lock implementation.
*
* Write locks set bit 31. Unlocking, is done by writing 0 since the lock is
* exclusively held.
*
* The memory barriers are implicit with the load-acquire and store-release
* instructions.
*/
static inline void arch_write_lock(arch_rwlock_t *rw)
{
unsigned int tmp;
asm volatile(ARM64_LSE_ATOMIC_INSN(
/* LL/SC */
" sevl\n"
"1: wfe\n"
"2: ldaxr %w0, %1\n"
" cbnz %w0, 1b\n"
" stxr %w0, %w2, %1\n"
" cbnz %w0, 2b\n"
__nops(1),
/* LSE atomics */
"1: mov %w0, wzr\n"
"2: casa %w0, %w2, %1\n"
" cbz %w0, 3f\n"
" ldxr %w0, %1\n"
" cbz %w0, 2b\n"
" wfe\n"
" b 1b\n"
"3:")
: "=&r" (tmp), "+Q" (rw->lock)
: "r" (0x80000000)
: "memory");
}
static inline int arch_write_trylock(arch_rwlock_t *rw)
{
unsigned int tmp;
asm volatile(ARM64_LSE_ATOMIC_INSN(
/* LL/SC */
"1: ldaxr %w0, %1\n"
" cbnz %w0, 2f\n"
" stxr %w0, %w2, %1\n"
" cbnz %w0, 1b\n"
"2:",
/* LSE atomics */
" mov %w0, wzr\n"
" casa %w0, %w2, %1\n"
__nops(2))
: "=&r" (tmp), "+Q" (rw->lock)
: "r" (0x80000000)
: "memory");
return !tmp;
}
static inline void arch_write_unlock(arch_rwlock_t *rw)
{
asm volatile(ARM64_LSE_ATOMIC_INSN(
" stlr wzr, %0",
" swpl wzr, wzr, %0")
: "=Q" (rw->lock) :: "memory");
}
/* write_can_lock - would write_trylock() succeed? */
#define arch_write_can_lock(x) ((x)->lock == 0)
/*
* Read lock implementation.
*
* It exclusively loads the lock value, increments it and stores the new value
* back if positive and the CPU still exclusively owns the location. If the
* value is negative, the lock is already held.
*
* During unlocking there may be multiple active read locks but no write lock.
*
* The memory barriers are implicit with the load-acquire and store-release
* instructions.
*
* Note that in UNDEFINED cases, such as unlocking a lock twice, the LL/SC
* and LSE implementations may exhibit different behaviour (although this
* will have no effect on lockdep).
*/
static inline void arch_read_lock(arch_rwlock_t *rw)
{
unsigned int tmp, tmp2;
asm volatile(
" sevl\n"
ARM64_LSE_ATOMIC_INSN(
/* LL/SC */
"1: wfe\n"
"2: ldaxr %w0, %2\n"
" add %w0, %w0, #1\n"
" tbnz %w0, #31, 1b\n"
" stxr %w1, %w0, %2\n"
" cbnz %w1, 2b\n"
__nops(1),
/* LSE atomics */
"1: wfe\n"
"2: ldxr %w0, %2\n"
" adds %w1, %w0, #1\n"
" tbnz %w1, #31, 1b\n"
" casa %w0, %w1, %2\n"
" sbc %w0, %w1, %w0\n"
" cbnz %w0, 2b")
: "=&r" (tmp), "=&r" (tmp2), "+Q" (rw->lock)
:
: "cc", "memory");
}
static inline void arch_read_unlock(arch_rwlock_t *rw)
{
unsigned int tmp, tmp2;
asm volatile(ARM64_LSE_ATOMIC_INSN(
/* LL/SC */
"1: ldxr %w0, %2\n"
" sub %w0, %w0, #1\n"
" stlxr %w1, %w0, %2\n"
" cbnz %w1, 1b",
/* LSE atomics */
" movn %w0, #0\n"
" staddl %w0, %2\n"
__nops(2))
: "=&r" (tmp), "=&r" (tmp2), "+Q" (rw->lock)
:
: "memory");
}
static inline int arch_read_trylock(arch_rwlock_t *rw)
{
unsigned int tmp, tmp2;
asm volatile(ARM64_LSE_ATOMIC_INSN(
/* LL/SC */
" mov %w1, #1\n"
"1: ldaxr %w0, %2\n"
" add %w0, %w0, #1\n"
" tbnz %w0, #31, 2f\n"
" stxr %w1, %w0, %2\n"
" cbnz %w1, 1b\n"
"2:",
/* LSE atomics */
" ldr %w0, %2\n"
" adds %w1, %w0, #1\n"
" tbnz %w1, #31, 1f\n"
" casa %w0, %w1, %2\n"
" sbc %w1, %w1, %w0\n"
__nops(1)
"1:")
: "=&r" (tmp), "=&r" (tmp2), "+Q" (rw->lock)
:
: "cc", "memory");
return !tmp2;
}
/* read_can_lock - would read_trylock() succeed? */
#define arch_read_can_lock(x) ((x)->lock < 0x80000000)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#include <asm/qrwlock.h>
/* See include/linux/spinlock.h */
#define smp_mb__after_spinlock() smp_mb()

6
arch/arm64/include/asm/spinlock_types.h
Просмотреть файл

@ -36,10 +36,6 @@ typedef struct {
#define __ARCH_SPIN_LOCK_UNLOCKED { 0 , 0 }
typedef struct {
volatile unsigned int lock;
} arch_rwlock_t;
#define __ARCH_RW_LOCK_UNLOCKED { 0 }
#include <asm-generic/qrwlock_types.h>
#endif

20
arch/blackfin/include/asm/spinlock.h
Просмотреть файл

@ -36,8 +36,6 @@ static inline void arch_spin_lock(arch_spinlock_t *lock)
__raw_spin_lock_asm(&lock->lock);
}
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
static inline int arch_spin_trylock(arch_spinlock_t *lock)
{
return __raw_spin_trylock_asm(&lock->lock);
@ -48,23 +46,11 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock)
__raw_spin_unlock_asm(&lock->lock);
}
static inline int arch_read_can_lock(arch_rwlock_t *rw)
{
return __raw_uncached_fetch_asm(&rw->lock) > 0;
}
static inline int arch_write_can_lock(arch_rwlock_t *rw)
{
return __raw_uncached_fetch_asm(&rw->lock) == RW_LOCK_BIAS;
}
static inline void arch_read_lock(arch_rwlock_t *rw)
{
__raw_read_lock_asm(&rw->lock);
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
static inline int arch_read_trylock(arch_rwlock_t *rw)
{
return __raw_read_trylock_asm(&rw->lock);
@ -80,8 +66,6 @@ static inline void arch_write_lock(arch_rwlock_t *rw)
__raw_write_lock_asm(&rw->lock);
}
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
static inline int arch_write_trylock(arch_rwlock_t *rw)
{
return __raw_write_trylock_asm(&rw->lock);
@ -92,10 +76,6 @@ static inline void arch_write_unlock(arch_rwlock_t *rw)
__raw_write_unlock_asm(&rw->lock);
}
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif
#endif /* !__BFIN_SPINLOCK_H */

15
arch/hexagon/include/asm/spinlock.h
Просмотреть файл

@ -86,16 +86,6 @@ static inline int arch_read_trylock(arch_rwlock_t *lock)
return temp;
}
static inline int arch_read_can_lock(arch_rwlock_t *rwlock)
{
return rwlock->lock == 0;
}
static inline int arch_write_can_lock(arch_rwlock_t *rwlock)
{
return rwlock->lock == 0;
}
/* Stuffs a -1 in the lock value? */
static inline void arch_write_lock(arch_rwlock_t *lock)
{
@ -177,11 +167,6 @@ static inline unsigned int arch_spin_trylock(arch_spinlock_t *lock)
/*
* SMP spinlocks are intended to allow only a single CPU at the lock
*/
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
#define arch_spin_is_locked(x) ((x)->lock != 0)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#endif

25
arch/ia64/include/asm/rwsem.h
Просмотреть файл

@ -38,15 +38,31 @@
/*
* lock for reading
*/
static inline void
__down_read (struct rw_semaphore *sem)
static inline int
___down_read (struct rw_semaphore *sem)
{
long result = ia64_fetchadd8_acq((unsigned long *)&sem->count.counter, 1);
if (result < 0)
return (result < 0);
}
static inline void
__down_read (struct rw_semaphore *sem)
{
if (___down_read(sem))
rwsem_down_read_failed(sem);
}
static inline int
__down_read_killable (struct rw_semaphore *sem)
{
if (___down_read(sem))
if (IS_ERR(rwsem_down_read_failed_killable(sem)))
return -EINTR;
return 0;
}
/*
* lock for writing
*/
@ -73,9 +89,10 @@ __down_write (struct rw_semaphore *sem)
static inline int
__down_write_killable (struct rw_semaphore *sem)
{
if (___down_write(sem))
if (___down_write(sem)) {
if (IS_ERR(rwsem_down_write_failed_killable(sem)))
return -EINTR;
}
return 0;
}

20
arch/ia64/include/asm/spinlock.h
Просмотреть файл

@ -62,7 +62,7 @@ static __always_inline void __ticket_spin_lock(arch_spinlock_t *lock)
static __always_inline int __ticket_spin_trylock(arch_spinlock_t *lock)
{
int tmp = ACCESS_ONCE(lock->lock);
int tmp = READ_ONCE(lock->lock);
if (!(((tmp >> TICKET_SHIFT) ^ tmp) & TICKET_MASK))
return ia64_cmpxchg(acq, &lock->lock, tmp, tmp + 1, sizeof (tmp)) == tmp;
@ -74,19 +74,19 @@ static __always_inline void __ticket_spin_unlock(arch_spinlock_t *lock)
unsigned short *p = (unsigned short *)&lock->lock + 1, tmp;
asm volatile ("ld2.bias %0=[%1]" : "=r"(tmp) : "r"(p));
ACCESS_ONCE(*p) = (tmp + 2) & ~1;
WRITE_ONCE(*p, (tmp + 2) & ~1);
}
static inline int __ticket_spin_is_locked(arch_spinlock_t *lock)
{
long tmp = ACCESS_ONCE(lock->lock);
long tmp = READ_ONCE(lock->lock);
return !!(((tmp >> TICKET_SHIFT) ^ tmp) & TICKET_MASK);
}
static inline int __ticket_spin_is_contended(arch_spinlock_t *lock)
{
long tmp = ACCESS_ONCE(lock->lock);
long tmp = READ_ONCE(lock->lock);
return ((tmp - (tmp >> TICKET_SHIFT)) & TICKET_MASK) > 1;
}
@ -127,9 +127,7 @@ static __always_inline void arch_spin_lock_flags(arch_spinlock_t *lock,
{
arch_spin_lock(lock);
}
#define arch_read_can_lock(rw) (*(volatile int *)(rw) >= 0)
#define arch_write_can_lock(rw) (*(volatile int *)(rw) == 0)
#define arch_spin_lock_flags arch_spin_lock_flags
#ifdef ASM_SUPPORTED
@ -157,6 +155,7 @@ arch_read_lock_flags(arch_rwlock_t *lock, unsigned long flags)
: "p6", "p7", "r2", "memory");
}
#define arch_read_lock_flags arch_read_lock_flags
#define arch_read_lock(lock) arch_read_lock_flags(lock, 0)
#else /* !ASM_SUPPORTED */
@ -209,6 +208,7 @@ arch_write_lock_flags(arch_rwlock_t *lock, unsigned long flags)
: "ar.ccv", "p6", "p7", "r2", "r29", "memory");
}
#define arch_write_lock_flags arch_write_lock_flags
#define arch_write_lock(rw) arch_write_lock_flags(rw, 0)
#define arch_write_trylock(rw) \
@ -232,8 +232,6 @@ static inline void arch_write_unlock(arch_rwlock_t *x)
#else /* !ASM_SUPPORTED */
#define arch_write_lock_flags(l, flags) arch_write_lock(l)
#define arch_write_lock(l) \
({ \
__u64 ia64_val, ia64_set_val = ia64_dep_mi(-1, 0, 31, 1); \
@ -273,8 +271,4 @@ static inline int arch_read_trylock(arch_rwlock_t *x)
return (u32)ia64_cmpxchg4_acq((__u32 *)(x), new.word, old.word) == old.word;
}
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* _ASM_IA64_SPINLOCK_H */

20
arch/m32r/include/asm/spinlock.h
Просмотреть файл

@ -29,7 +29,6 @@
*/
#define arch_spin_is_locked(x) (*(volatile int *)(&(x)->slock) <= 0)
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
/**
* arch_spin_trylock - Try spin lock and return a result
@ -138,18 +137,6 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock)
* semaphore.h for details. -ben
*/
/**
* read_can_lock - would read_trylock() succeed?
* @lock: the rwlock in question.
*/
#define arch_read_can_lock(x) ((int)(x)->lock > 0)
/**
* write_can_lock - would write_trylock() succeed?
* @lock: the rwlock in question.
*/
#define arch_write_can_lock(x) ((x)->lock == RW_LOCK_BIAS)
static inline void arch_read_lock(arch_rwlock_t *rw)
{
unsigned long tmp0, tmp1;
@ -318,11 +305,4 @@ static inline int arch_write_trylock(arch_rwlock_t *lock)
return 0;
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* _ASM_M32R_SPINLOCK_H */

9
arch/metag/include/asm/spinlock.h
Просмотреть файл

@ -16,13 +16,4 @@
* locked.
*/
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SPINLOCK_H */

37
arch/metag/include/asm/spinlock_lnkget.h
Просмотреть файл

@ -137,21 +137,6 @@ static inline void arch_write_unlock(arch_rwlock_t *rw)
: "memory");
}
/* write_can_lock - would write_trylock() succeed? */
static inline int arch_write_can_lock(arch_rwlock_t *rw)
{
int ret;
asm volatile ("LNKGETD %0, [%1]\n"
"CMP %0, #0\n"
"MOV %0, #1\n"
"XORNZ %0, %0, %0\n"
: "=&d" (ret)
: "da" (&rw->lock)
: "cc");
return ret;
}
/*
* Read locks are a bit more hairy:
* - Exclusively load the lock value.
@ -225,26 +210,4 @@ static inline int arch_read_trylock(arch_rwlock_t *rw)
return tmp;
}
/* read_can_lock - would read_trylock() succeed? */
static inline int arch_read_can_lock(arch_rwlock_t *rw)
{
int tmp;
asm volatile ("LNKGETD %0, [%1]\n"
"CMP %0, %2\n"
"MOV %0, #1\n"
"XORZ %0, %0, %0\n"
: "=&d" (tmp)
: "da" (&rw->lock), "bd" (0x80000000)
: "cc");
return tmp;
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SPINLOCK_LNKGET_H */

20
arch/metag/include/asm/spinlock_lock1.h
Просмотреть файл

@ -105,16 +105,6 @@ static inline void arch_write_unlock(arch_rwlock_t *rw)
rw->lock = 0;
}
/* write_can_lock - would write_trylock() succeed? */
static inline int arch_write_can_lock(arch_rwlock_t *rw)
{
unsigned int ret;
barrier();
ret = rw->lock;
return (ret == 0);
}
/*
* Read locks are a bit more hairy:
* - Exclusively load the lock value.
@ -172,14 +162,4 @@ static inline int arch_read_trylock(arch_rwlock_t *rw)
return (ret < 0x80000000);
}
/* read_can_lock - would read_trylock() succeed? */
static inline int arch_read_can_lock(arch_rwlock_t *rw)
{
unsigned int ret;
barrier();
ret = rw->lock;
return (ret < 0x80000000);
}
#endif /* __ASM_SPINLOCK_LOCK1_H */

7
arch/mips/include/asm/spinlock.h
Просмотреть файл

@ -13,11 +13,4 @@
#include <asm/qrwlock.h>
#include <asm/qspinlock.h>
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* _ASM_SPINLOCK_H */

2
arch/mips/include/asm/vdso.h
Просмотреть файл

@ -99,7 +99,7 @@ static inline u32 vdso_data_read_begin(const union mips_vdso_data *data)
u32 seq;
while (true) {
seq = ACCESS_ONCE(data->seq_count);
seq = READ_ONCE(data->seq_count);
if (likely(!(seq & 1))) {
/* Paired with smp_wmb() in vdso_data_write_*(). */
smp_rmb();

2
arch/mips/kernel/pm-cps.c
Просмотреть файл

@ -166,7 +166,7 @@ int cps_pm_enter_state(enum cps_pm_state state)
nc_core_ready_count = nc_addr;
/* Ensure ready_count is zero-initialised before the assembly runs */
ACCESS_ONCE(*nc_core_ready_count) = 0;
WRITE_ONCE(*nc_core_ready_count, 0);
coupled_barrier(&per_cpu(pm_barrier, core), online);
/* Run the generated entry code */

16
arch/mn10300/include/asm/spinlock.h
Просмотреть файл

@ -84,6 +84,7 @@ static inline void arch_spin_lock_flags(arch_spinlock_t *lock,
: "d" (flags), "a"(&lock->slock), "i"(EPSW_IE | MN10300_CLI_LEVEL)
: "memory", "cc");
}
#define arch_spin_lock_flags arch_spin_lock_flags
#ifdef __KERNEL__
@ -98,18 +99,6 @@ static inline void arch_spin_lock_flags(arch_spinlock_t *lock,
* read-locks.
*/
/**
* read_can_lock - would read_trylock() succeed?
* @lock: the rwlock in question.
*/
#define arch_read_can_lock(x) ((int)(x)->lock > 0)
/**
* write_can_lock - would write_trylock() succeed?
* @lock: the rwlock in question.
*/
#define arch_write_can_lock(x) ((x)->lock == RW_LOCK_BIAS)
/*
* On mn10300, we implement read-write locks as a 32-bit counter
* with the high bit (sign) being the "contended" bit.
@ -183,9 +172,6 @@ static inline int arch_write_trylock(arch_rwlock_t *lock)
return 0;
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define _raw_spin_relax(lock) cpu_relax()
#define _raw_read_relax(lock) cpu_relax()
#define _raw_write_relax(lock) cpu_relax()

4
arch/mn10300/kernel/mn10300-serial.c
Просмотреть файл

@ -543,7 +543,7 @@ static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
try_again:
/* pull chars out of the hat */
ix = ACCESS_ONCE(port->rx_outp);
ix = READ_ONCE(port->rx_outp);
if (CIRC_CNT(port->rx_inp, ix, MNSC_BUFFER_SIZE) == 0) {
if (push && !tport->low_latency)
tty_flip_buffer_push(tport);
@ -1724,7 +1724,7 @@ static int mn10300_serial_poll_get_char(struct uart_port *_port)
if (mn10300_serial_int_tbl[port->rx_irq].port != NULL) {
do {
/* pull chars out of the hat */
ix = ACCESS_ONCE(port->rx_outp);
ix = READ_ONCE(port->rx_outp);
if (CIRC_CNT(port->rx_inp, ix, MNSC_BUFFER_SIZE) == 0)
return NO_POLL_CHAR;

2
arch/parisc/include/asm/atomic.h
Просмотреть файл

@ -261,7 +261,7 @@ atomic64_set(atomic64_t *v, s64 i)
static __inline__ s64
atomic64_read(const atomic64_t *v)
{
return ACCESS_ONCE((v)->counter);
return READ_ONCE((v)->counter);
}
#define atomic64_inc(v) (atomic64_add( 1,(v)))

22
arch/parisc/include/asm/spinlock.h
Просмотреть файл

@ -32,6 +32,7 @@ static inline void arch_spin_lock_flags(arch_spinlock_t *x,
cpu_relax();
mb();
}
#define arch_spin_lock_flags arch_spin_lock_flags
static inline void arch_spin_unlock(arch_spinlock_t *x)
{
@ -169,25 +170,4 @@ static __inline__ int arch_write_trylock(arch_rwlock_t *rw)
return result;
}
/*
* read_can_lock - would read_trylock() succeed?
* @lock: the rwlock in question.
*/
static __inline__ int arch_read_can_lock(arch_rwlock_t *rw)
{
return rw->counter >= 0;
}
/*
* write_can_lock - would write_trylock() succeed?
* @lock: the rwlock in question.
*/
static __inline__ int arch_write_can_lock(arch_rwlock_t *rw)
{
return !rw->counter;
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#endif /* __ASM_SPINLOCK_H */

7
arch/powerpc/include/asm/spinlock.h
Просмотреть файл

@ -161,6 +161,7 @@ void arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags)
local_irq_restore(flags_dis);
}
}
#define arch_spin_lock_flags arch_spin_lock_flags
static inline void arch_spin_unlock(arch_spinlock_t *lock)
{
@ -181,9 +182,6 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock)
* read-locks.
*/
#define arch_read_can_lock(rw) ((rw)->lock >= 0)
#define arch_write_can_lock(rw) (!(rw)->lock)
#ifdef CONFIG_PPC64
#define __DO_SIGN_EXTEND "extsw %0,%0\n"
#define WRLOCK_TOKEN LOCK_TOKEN /* it's negative */
@ -302,9 +300,6 @@ static inline void arch_write_unlock(arch_rwlock_t *rw)
rw->lock = 0;
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) __spin_yield(lock)
#define arch_read_relax(lock) __rw_yield(lock)
#define arch_write_relax(lock) __rw_yield(lock)

2
arch/powerpc/kernel/rtas.c
Просмотреть файл

@ -78,7 +78,7 @@ static unsigned long lock_rtas(void)
local_irq_save(flags);
preempt_disable();
arch_spin_lock_flags(&rtas.lock, flags);
arch_spin_lock(&rtas.lock);
return flags;
}

2
arch/powerpc/platforms/powernv/opal-msglog.c
Просмотреть файл

@ -43,7 +43,7 @@ ssize_t opal_msglog_copy(char *to, loff_t pos, size_t count)
if (!opal_memcons)
return -ENODEV;
out_pos = be32_to_cpu(ACCESS_ONCE(opal_memcons->out_pos));
out_pos = be32_to_cpu(READ_ONCE(opal_memcons->out_pos));
/* Now we've read out_pos, put a barrier in before reading the new
* data it points to in conbuf. */

16
arch/s390/include/asm/spinlock.h
Просмотреть файл

@ -38,6 +38,7 @@ bool arch_vcpu_is_preempted(int cpu);
*/
void arch_spin_relax(arch_spinlock_t *lock);
#define arch_spin_relax arch_spin_relax
void arch_spin_lock_wait(arch_spinlock_t *);
int arch_spin_trylock_retry(arch_spinlock_t *);
@ -76,6 +77,7 @@ static inline void arch_spin_lock_flags(arch_spinlock_t *lp,
if (!arch_spin_trylock_once(lp))
arch_spin_lock_wait(lp);
}
#define arch_spin_lock_flags arch_spin_lock_flags
static inline int arch_spin_trylock(arch_spinlock_t *lp)
{
@ -105,20 +107,6 @@ static inline void arch_spin_unlock(arch_spinlock_t *lp)
* read-locks.
*/
/**
* read_can_lock - would read_trylock() succeed?
* @lock: the rwlock in question.
*/
#define arch_read_can_lock(x) (((x)->cnts & 0xffff0000) == 0)
/**
* write_can_lock - would write_trylock() succeed?
* @lock: the rwlock in question.
*/
#define arch_write_can_lock(x) ((x)->cnts == 0)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_read_relax(rw) barrier()
#define arch_write_relax(rw) barrier()

2
arch/s390/lib/spinlock.c
Просмотреть файл

@ -215,7 +215,7 @@ static inline void arch_spin_lock_classic(arch_spinlock_t *lp)
lockval = SPINLOCK_LOCKVAL; /* cpu + 1 */
/* Pass the virtual CPU to the lock holder if it is not running */
owner = arch_spin_yield_target(ACCESS_ONCE(lp->lock), NULL);
owner = arch_spin_yield_target(READ_ONCE(lp->lock), NULL);
if (owner && arch_vcpu_is_preempted(owner - 1))
smp_yield_cpu(owner - 1);

20
arch/sh/include/asm/spinlock-cas.h
Просмотреть файл

@ -27,7 +27,6 @@ static inline unsigned __sl_cas(volatile unsigned *p, unsigned old, unsigned new
*/
#define arch_spin_is_locked(x) ((x)->lock <= 0)
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
static inline void arch_spin_lock(arch_spinlock_t *lock)
{
@ -53,18 +52,6 @@ static inline int arch_spin_trylock(arch_spinlock_t *lock)
* read-locks.
*/
/**
* read_can_lock - would read_trylock() succeed?
* @lock: the rwlock in question.
*/
#define arch_read_can_lock(x) ((x)->lock > 0)
/**
* write_can_lock - would write_trylock() succeed?
* @lock: the rwlock in question.
*/
#define arch_write_can_lock(x) ((x)->lock == RW_LOCK_BIAS)
static inline void arch_read_lock(arch_rwlock_t *rw)
{
unsigned old;
@ -102,11 +89,4 @@ static inline int arch_write_trylock(arch_rwlock_t *rw)
return __sl_cas(&rw->lock, RW_LOCK_BIAS, 0) == RW_LOCK_BIAS;
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SH_SPINLOCK_CAS_H */

20
arch/sh/include/asm/spinlock-llsc.h
Просмотреть файл

@ -19,7 +19,6 @@
*/
#define arch_spin_is_locked(x) ((x)->lock <= 0)
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
/*
* Simple spin lock operations. There are two variants, one clears IRQ's
@ -89,18 +88,6 @@ static inline int arch_spin_trylock(arch_spinlock_t *lock)
* read-locks.
*/
/**
* read_can_lock - would read_trylock() succeed?
* @lock: the rwlock in question.
*/
#define arch_read_can_lock(x) ((x)->lock > 0)
/**
* write_can_lock - would write_trylock() succeed?
* @lock: the rwlock in question.
*/
#define arch_write_can_lock(x) ((x)->lock == RW_LOCK_BIAS)
static inline void arch_read_lock(arch_rwlock_t *rw)
{
unsigned long tmp;
@ -209,11 +196,4 @@ static inline int arch_write_trylock(arch_rwlock_t *rw)
return (oldval > (RW_LOCK_BIAS - 1));
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SH_SPINLOCK_LLSC_H */

2
arch/sparc/include/asm/atomic_32.h
Просмотреть файл

@ -32,7 +32,7 @@ void atomic_set(atomic_t *, int);
#define atomic_set_release(v, i) atomic_set((v), (i))
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic_read(v) READ_ONCE((v)->counter)
#define atomic_add(i, v) ((void)atomic_add_return( (int)(i), (v)))
#define atomic_sub(i, v) ((void)atomic_add_return(-(int)(i), (v)))

1
arch/sparc/include/asm/ptrace.h
Просмотреть файл

@ -7,6 +7,7 @@
#if defined(__sparc__) && defined(__arch64__)
#ifndef __ASSEMBLY__
#include <linux/compiler.h>
#include <linux/threads.h>
#include <asm/switch_to.h>

11
arch/sparc/include/asm/spinlock_32.h
Просмотреть файл

@ -183,17 +183,6 @@ static inline int __arch_read_trylock(arch_rwlock_t *rw)
res; \
})
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
#define arch_read_lock_flags(rw, flags) arch_read_lock(rw)
#define arch_write_lock_flags(rw, flags) arch_write_lock(rw)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#define arch_read_can_lock(rw) (!((rw)->lock & 0xff))
#define arch_write_can_lock(rw) (!(rw)->lock)
#endif /* !(__ASSEMBLY__) */
#endif /* __SPARC_SPINLOCK_H */

7
arch/sparc/include/asm/spinlock_64.h
Просмотреть файл

@ -14,13 +14,6 @@
#include <asm/qrwlock.h>
#include <asm/qspinlock.h>
#define arch_read_lock_flags(p, f) arch_read_lock(p)
#define arch_write_lock_flags(p, f) arch_write_lock(p)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* !(__ASSEMBLY__) */
#endif /* !(__SPARC64_SPINLOCK_H) */

4
arch/tile/gxio/dma_queue.c
Просмотреть файл

@ -163,14 +163,14 @@ int __gxio_dma_queue_is_complete(__gxio_dma_queue_t *dma_queue,
int64_t completion_slot, int update)
{
if (update) {
if (ACCESS_ONCE(dma_queue->hw_complete_count) >
if (READ_ONCE(dma_queue->hw_complete_count) >
completion_slot)
return 1;
__gxio_dma_queue_update_credits(dma_queue);
}
return ACCESS_ONCE(dma_queue->hw_complete_count) > completion_slot;
return READ_ONCE(dma_queue->hw_complete_count) > completion_slot;
}
EXPORT_SYMBOL_GPL(__gxio_dma_queue_is_complete);

22
arch/tile/include/asm/spinlock_32.h
Просмотреть файл

@ -51,9 +51,6 @@ static inline int arch_spin_is_locked(arch_spinlock_t *lock)
void arch_spin_lock(arch_spinlock_t *lock);
/* We cannot take an interrupt after getting a ticket, so don't enable them. */
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
int arch_spin_trylock(arch_spinlock_t *lock);
static inline void arch_spin_unlock(arch_spinlock_t *lock)
@ -79,22 +76,6 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock)
#define _RD_COUNT_SHIFT 24
#define _RD_COUNT_WIDTH 8
/**
* arch_read_can_lock() - would read_trylock() succeed?
*/
static inline int arch_read_can_lock(arch_rwlock_t *rwlock)
{
return (rwlock->lock << _RD_COUNT_WIDTH) == 0;
}
/**
* arch_write_can_lock() - would write_trylock() succeed?
*/
static inline int arch_write_can_lock(arch_rwlock_t *rwlock)
{
return rwlock->lock == 0;
}
/**
* arch_read_lock() - acquire a read lock.
*/
@ -125,7 +106,4 @@ void arch_read_unlock(arch_rwlock_t *rwlock);
*/
void arch_write_unlock(arch_rwlock_t *rwlock);
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#endif /* _ASM_TILE_SPINLOCK_32_H */

24
arch/tile/include/asm/spinlock_64.h
Просмотреть файл

@ -75,9 +75,6 @@ static inline void arch_spin_lock(arch_spinlock_t *lock)
/* Try to get the lock, and return whether we succeeded. */
int arch_spin_trylock(arch_spinlock_t *lock);
/* We cannot take an interrupt after getting a ticket, so don't enable them. */
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
/*
* Read-write spinlocks, allowing multiple readers
* but only one writer.
@ -93,24 +90,6 @@ static inline int arch_write_val_locked(int val)
return val < 0; /* Optimize "val & __WRITE_LOCK_BIT". */
}
/**
* read_can_lock - would read_trylock() succeed?
* @lock: the rwlock in question.
*/
static inline int arch_read_can_lock(arch_rwlock_t *rw)
{
return !arch_write_val_locked(rw->lock);
}
/**
* write_can_lock - would write_trylock() succeed?
* @lock: the rwlock in question.
*/
static inline int arch_write_can_lock(arch_rwlock_t *rw)
{
return rw->lock == 0;
}
extern void __read_lock_failed(arch_rwlock_t *rw);
static inline void arch_read_lock(arch_rwlock_t *rw)
@ -156,7 +135,4 @@ static inline int arch_write_trylock(arch_rwlock_t *rw)
return 0;
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#endif /* _ASM_TILE_SPINLOCK_64_H */

2
arch/tile/include/gxio/dma_queue.h
Просмотреть файл

@ -121,7 +121,7 @@ static inline int64_t __gxio_dma_queue_reserve(__gxio_dma_queue_t *dma_queue,
* if the result is LESS than "hw_complete_count".
*/
uint64_t complete;
complete = ACCESS_ONCE(dma_queue->hw_complete_count);
complete = READ_ONCE(dma_queue->hw_complete_count);
slot |= (complete & 0xffffffffff000000);
if (slot < complete)
slot += 0x1000000;

2
arch/tile/kernel/ptrace.c
Просмотреть файл

@ -255,7 +255,7 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
int do_syscall_trace_enter(struct pt_regs *regs)
{
u32 work = ACCESS_ONCE(current_thread_info()->flags);
u32 work = READ_ONCE(current_thread_info()->flags);
if ((work & _TIF_SYSCALL_TRACE) &&
tracehook_report_syscall_entry(regs)) {

2
arch/um/include/shared/init.h
Просмотреть файл

@ -41,7 +41,7 @@
typedef int (*initcall_t)(void);
typedef void (*exitcall_t)(void);
#include <linux/compiler.h>
#include <linux/compiler_types.h>
/* These are for everybody (although not all archs will actually
discard it in modules) */

2
arch/x86/Kconfig
Просмотреть файл

@ -56,7 +56,7 @@ config X86
select ARCH_HAS_KCOV if X86_64
select ARCH_HAS_PMEM_API if X86_64
# Causing hangs/crashes, see the commit that added this change for details.
select ARCH_HAS_REFCOUNT if BROKEN
select ARCH_HAS_REFCOUNT
select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_SG_CHAIN

6
arch/x86/entry/common.c
Просмотреть файл

@ -75,7 +75,7 @@ static long syscall_trace_enter(struct pt_regs *regs)
if (IS_ENABLED(CONFIG_DEBUG_ENTRY))
BUG_ON(regs != task_pt_regs(current));
work = ACCESS_ONCE(ti->flags) & _TIF_WORK_SYSCALL_ENTRY;
work = READ_ONCE(ti->flags) & _TIF_WORK_SYSCALL_ENTRY;
if (unlikely(work & _TIF_SYSCALL_EMU))
emulated = true;
@ -186,9 +186,7 @@ __visible inline void prepare_exit_to_usermode(struct pt_regs *regs)
addr_limit_user_check();
if (IS_ENABLED(CONFIG_PROVE_LOCKING) && WARN_ON(!irqs_disabled()))
local_irq_disable();
lockdep_assert_irqs_disabled();
lockdep_sys_exit();
cached_flags = READ_ONCE(ti->flags);

2
arch/x86/entry/vdso/vclock_gettime.c
Просмотреть файл

@ -318,7 +318,7 @@ int gettimeofday(struct timeval *, struct timezone *)
notrace time_t __vdso_time(time_t *t)
{
/* This is atomic on x86 so we don't need any locks. */
time_t result = ACCESS_ONCE(gtod->wall_time_sec);
time_t result = READ_ONCE(gtod->wall_time_sec);
if (t)
*t = result;

4
arch/x86/events/core.c
Просмотреть файл

@ -2118,7 +2118,7 @@ static int x86_pmu_event_init(struct perf_event *event)
event->destroy(event);
}
if (ACCESS_ONCE(x86_pmu.attr_rdpmc))
if (READ_ONCE(x86_pmu.attr_rdpmc))
event->hw.flags |= PERF_X86_EVENT_RDPMC_ALLOWED;
return err;
@ -2371,7 +2371,7 @@ static unsigned long get_segment_base(unsigned int segment)
struct ldt_struct *ldt;
/* IRQs are off, so this synchronizes with smp_store_release */
ldt = lockless_dereference(current->active_mm->context.ldt);
ldt = READ_ONCE(current->active_mm->context.ldt);
if (!ldt || idx >= ldt->nr_entries)
return 0;

12
arch/x86/include/asm/barrier.h
Просмотреть файл

@ -12,11 +12,11 @@
*/
#ifdef CONFIG_X86_32
#define mb() asm volatile(ALTERNATIVE("lock; addl $0,0(%%esp)", "mfence", \
#define mb() asm volatile(ALTERNATIVE("lock; addl $0,-4(%%esp)", "mfence", \
X86_FEATURE_XMM2) ::: "memory", "cc")
#define rmb() asm volatile(ALTERNATIVE("lock; addl $0,0(%%esp)", "lfence", \
#define rmb() asm volatile(ALTERNATIVE("lock; addl $0,-4(%%esp)", "lfence", \
X86_FEATURE_XMM2) ::: "memory", "cc")
#define wmb() asm volatile(ALTERNATIVE("lock; addl $0,0(%%esp)", "sfence", \
#define wmb() asm volatile(ALTERNATIVE("lock; addl $0,-4(%%esp)", "sfence", \
X86_FEATURE_XMM2) ::: "memory", "cc")
#else
#define mb() asm volatile("mfence":::"memory")
@ -31,7 +31,11 @@
#endif
#define dma_wmb() barrier()
#define __smp_mb() mb()
#ifdef CONFIG_X86_32
#define __smp_mb() asm volatile("lock; addl $0,-4(%%esp)" ::: "memory", "cc")
#else
#define __smp_mb() asm volatile("lock; addl $0,-4(%%rsp)" ::: "memory", "cc")
#endif
#define __smp_rmb() dma_rmb()
#define __smp_wmb() barrier()
#define __smp_store_mb(var, value) do { (void)xchg(&var, value); } while (0)

4
arch/x86/include/asm/mmu_context.h
Просмотреть файл

@ -73,8 +73,8 @@ static inline void load_mm_ldt(struct mm_struct *mm)
#ifdef CONFIG_MODIFY_LDT_SYSCALL
struct ldt_struct *ldt;
/* lockless_dereference synchronizes with smp_store_release */
ldt = lockless_dereference(mm->context.ldt);
/* READ_ONCE synchronizes with smp_store_release */
ldt = READ_ONCE(mm->context.ldt);
/*
* Any change to mm->context.ldt is followed by an IPI to all

11
arch/x86/include/asm/qspinlock.h
Просмотреть файл

@ -2,6 +2,7 @@
#ifndef _ASM_X86_QSPINLOCK_H
#define _ASM_X86_QSPINLOCK_H
#include <linux/jump_label.h>
#include <asm/cpufeature.h>
#include <asm-generic/qspinlock_types.h>
#include <asm/paravirt.h>
@ -47,10 +48,14 @@ static inline void queued_spin_unlock(struct qspinlock *lock)
#endif
#ifdef CONFIG_PARAVIRT
DECLARE_STATIC_KEY_TRUE(virt_spin_lock_key);
void native_pv_lock_init(void) __init;
#define virt_spin_lock virt_spin_lock
static inline bool virt_spin_lock(struct qspinlock *lock)
{
if (!static_cpu_has(X86_FEATURE_HYPERVISOR))
if (!static_branch_likely(&virt_spin_lock_key))
return false;
/*
@ -66,6 +71,10 @@ static inline bool virt_spin_lock(struct qspinlock *lock)
return true;
}
#else
static inline void native_pv_lock_init(void)
{
}
#endif /* CONFIG_PARAVIRT */
#include <asm-generic/qspinlock.h>

2
arch/x86/include/asm/refcount.h
Просмотреть файл

@ -15,7 +15,7 @@
* back to the regular execution flow in .text.
*/
#define _REFCOUNT_EXCEPTION \
".pushsection .text.unlikely\n" \
".pushsection .text..refcount\n" \
"111:\tlea %[counter], %%" _ASM_CX "\n" \
"112:\t" ASM_UD0 "\n" \
ASM_UNREACHABLE \

84
arch/x86/include/asm/rwsem.h
Просмотреть файл

@ -61,18 +61,33 @@
/*
* lock for reading
*/
#define ____down_read(sem, slow_path) \
({ \
struct rw_semaphore* ret; \
asm volatile("# beginning down_read\n\t" \
LOCK_PREFIX _ASM_INC "(%[sem])\n\t" \
/* adds 0x00000001 */ \
" jns 1f\n" \
" call " slow_path "\n" \
"1:\n\t" \
"# ending down_read\n\t" \
: "+m" (sem->count), "=a" (ret), \
ASM_CALL_CONSTRAINT \
: [sem] "a" (sem) \
: "memory", "cc"); \
ret; \
})
static inline void __down_read(struct rw_semaphore *sem)
{
asm volatile("# beginning down_read\n\t"
LOCK_PREFIX _ASM_INC "(%1)\n\t"
/* adds 0x00000001 */
" jns 1f\n"
" call call_rwsem_down_read_failed\n"
"1:\n\t"
"# ending down_read\n\t"
: "+m" (sem->count)
: "a" (sem)
: "memory", "cc");
____down_read(sem, "call_rwsem_down_read_failed");
}
static inline int __down_read_killable(struct rw_semaphore *sem)
{
if (IS_ERR(____down_read(sem, "call_rwsem_down_read_failed_killable")))
return -EINTR;
return 0;
}
/*
@ -82,17 +97,18 @@ static inline bool __down_read_trylock(struct rw_semaphore *sem)
{
long result, tmp;
asm volatile("# beginning __down_read_trylock\n\t"
" mov %0,%1\n\t"
" mov %[count],%[result]\n\t"
"1:\n\t"
" mov %1,%2\n\t"
" add %3,%2\n\t"
" mov %[result],%[tmp]\n\t"
" add %[inc],%[tmp]\n\t"
" jle 2f\n\t"
LOCK_PREFIX " cmpxchg %2,%0\n\t"
LOCK_PREFIX " cmpxchg %[tmp],%[count]\n\t"
" jnz 1b\n\t"
"2:\n\t"
"# ending __down_read_trylock\n\t"
: "+m" (sem->count), "=&a" (result), "=&r" (tmp)
: "i" (RWSEM_ACTIVE_READ_BIAS)
: [count] "+m" (sem->count), [result] "=&a" (result),
[tmp] "=&r" (tmp)
: [inc] "i" (RWSEM_ACTIVE_READ_BIAS)
: "memory", "cc");
return result >= 0;
}
@ -106,7 +122,7 @@ static inline bool __down_read_trylock(struct rw_semaphore *sem)
struct rw_semaphore* ret; \
\
asm volatile("# beginning down_write\n\t" \
LOCK_PREFIX " xadd %1,(%4)\n\t" \
LOCK_PREFIX " xadd %[tmp],(%[sem])\n\t" \
/* adds 0xffff0001, returns the old value */ \
" test " __ASM_SEL(%w1,%k1) "," __ASM_SEL(%w1,%k1) "\n\t" \
/* was the active mask 0 before? */\
@ -114,9 +130,9 @@ static inline bool __down_read_trylock(struct rw_semaphore *sem)
" call " slow_path "\n" \
"1:\n" \
"# ending down_write" \
: "+m" (sem->count), "=d" (tmp), \
: "+m" (sem->count), [tmp] "=d" (tmp), \
"=a" (ret), ASM_CALL_CONSTRAINT \
: "a" (sem), "1" (RWSEM_ACTIVE_WRITE_BIAS) \
: [sem] "a" (sem), "[tmp]" (RWSEM_ACTIVE_WRITE_BIAS) \
: "memory", "cc"); \
ret; \
})
@ -142,21 +158,21 @@ static inline bool __down_write_trylock(struct rw_semaphore *sem)
bool result;
long tmp0, tmp1;
asm volatile("# beginning __down_write_trylock\n\t"
" mov %0,%1\n\t"
" mov %[count],%[tmp0]\n\t"
"1:\n\t"
" test " __ASM_SEL(%w1,%k1) "," __ASM_SEL(%w1,%k1) "\n\t"
/* was the active mask 0 before? */
" jnz 2f\n\t"
" mov %1,%2\n\t"
" add %4,%2\n\t"
LOCK_PREFIX " cmpxchg %2,%0\n\t"
" mov %[tmp0],%[tmp1]\n\t"
" add %[inc],%[tmp1]\n\t"
LOCK_PREFIX " cmpxchg %[tmp1],%[count]\n\t"
" jnz 1b\n\t"
"2:\n\t"
CC_SET(e)
"# ending __down_write_trylock\n\t"
: "+m" (sem->count), "=&a" (tmp0), "=&r" (tmp1),
CC_OUT(e) (result)
: "er" (RWSEM_ACTIVE_WRITE_BIAS)
: [count] "+m" (sem->count), [tmp0] "=&a" (tmp0),
[tmp1] "=&r" (tmp1), CC_OUT(e) (result)
: [inc] "er" (RWSEM_ACTIVE_WRITE_BIAS)
: "memory");
return result;
}
@ -168,14 +184,14 @@ static inline void __up_read(struct rw_semaphore *sem)
{
long tmp;
asm volatile("# beginning __up_read\n\t"
LOCK_PREFIX " xadd %1,(%2)\n\t"
LOCK_PREFIX " xadd %[tmp],(%[sem])\n\t"
/* subtracts 1, returns the old value */
" jns 1f\n\t"
" call call_rwsem_wake\n" /* expects old value in %edx */
"1:\n"
"# ending __up_read\n"
: "+m" (sem->count), "=d" (tmp)
: "a" (sem), "1" (-RWSEM_ACTIVE_READ_BIAS)
: "+m" (sem->count), [tmp] "=d" (tmp)
: [sem] "a" (sem), "[tmp]" (-RWSEM_ACTIVE_READ_BIAS)
: "memory", "cc");
}
@ -186,14 +202,14 @@ static inline void __up_write(struct rw_semaphore *sem)
{
long tmp;
asm volatile("# beginning __up_write\n\t"
LOCK_PREFIX " xadd %1,(%2)\n\t"
LOCK_PREFIX " xadd %[tmp],(%[sem])\n\t"
/* subtracts 0xffff0001, returns the old value */
" jns 1f\n\t"
" call call_rwsem_wake\n" /* expects old value in %edx */
"1:\n\t"
"# ending __up_write\n"
: "+m" (sem->count), "=d" (tmp)
: "a" (sem), "1" (-RWSEM_ACTIVE_WRITE_BIAS)
: "+m" (sem->count), [tmp] "=d" (tmp)
: [sem] "a" (sem), "[tmp]" (-RWSEM_ACTIVE_WRITE_BIAS)
: "memory", "cc");
}
@ -203,7 +219,7 @@ static inline void __up_write(struct rw_semaphore *sem)
static inline void __downgrade_write(struct rw_semaphore *sem)
{
asm volatile("# beginning __downgrade_write\n\t"
LOCK_PREFIX _ASM_ADD "%2,(%1)\n\t"
LOCK_PREFIX _ASM_ADD "%[inc],(%[sem])\n\t"
/*
* transitions 0xZZZZ0001 -> 0xYYYY0001 (i386)
* 0xZZZZZZZZ00000001 -> 0xYYYYYYYY00000001 (x86_64)
@ -213,7 +229,7 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
"1:\n\t"
"# ending __downgrade_write\n"
: "+m" (sem->count)
: "a" (sem), "er" (-RWSEM_WAITING_BIAS)
: [sem] "a" (sem), [inc] "er" (-RWSEM_WAITING_BIAS)
: "memory", "cc");
}

7
arch/x86/include/asm/spinlock.h
Просмотреть файл

@ -42,11 +42,4 @@
#include <asm/qrwlock.h>
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* _ASM_X86_SPINLOCK_H */

2
arch/x86/include/asm/vgtod.h
Просмотреть файл

@ -49,7 +49,7 @@ static inline unsigned gtod_read_begin(const struct vsyscall_gtod_data *s)
unsigned ret;
repeat:
ret = ACCESS_ONCE(s->seq);
ret = READ_ONCE(s->seq);
if (unlikely(ret & 1)) {
cpu_relax();
goto repeat;

6
arch/x86/kernel/espfix_64.c
Просмотреть файл

@ -155,14 +155,14 @@ void init_espfix_ap(int cpu)
page = cpu/ESPFIX_STACKS_PER_PAGE;
/* Did another CPU already set this up? */
stack_page = ACCESS_ONCE(espfix_pages[page]);
stack_page = READ_ONCE(espfix_pages[page]);
if (likely(stack_page))
goto done;
mutex_lock(&espfix_init_mutex);
/* Did we race on the lock? */
stack_page = ACCESS_ONCE(espfix_pages[page]);
stack_page = READ_ONCE(espfix_pages[page]);
if (stack_page)
goto unlock_done;
@ -200,7 +200,7 @@ void init_espfix_ap(int cpu)
set_pte(&pte_p[n*PTE_STRIDE], pte);
/* Job is done for this CPU and any CPU which shares this page */
ACCESS_ONCE(espfix_pages[page]) = stack_page;
WRITE_ONCE(espfix_pages[page], stack_page);
unlock_done:
mutex_unlock(&espfix_init_mutex);

2
arch/x86/kernel/ldt.c
Просмотреть файл

@ -102,7 +102,7 @@ static void finalize_ldt_struct(struct ldt_struct *ldt)
static void install_ldt(struct mm_struct *current_mm,
struct ldt_struct *ldt)
{
/* Synchronizes with lockless_dereference in load_mm_ldt. */
/* Synchronizes with READ_ONCE in load_mm_ldt. */
smp_store_release(&current_mm->context.ldt, ldt);
/* Activate the LDT for all CPUs using current_mm. */

2
arch/x86/kernel/nmi.c
Просмотреть файл

@ -105,7 +105,7 @@ static void nmi_max_handler(struct irq_work *w)
{
struct nmiaction *a = container_of(w, struct nmiaction, irq_work);
int remainder_ns, decimal_msecs;
u64 whole_msecs = ACCESS_ONCE(a->max_duration);
u64 whole_msecs = READ_ONCE(a->max_duration);
remainder_ns = do_div(whole_msecs, (1000 * 1000));
decimal_msecs = remainder_ns / 1000;

14
arch/x86/kernel/paravirt.c
Просмотреть файл

@ -115,8 +115,18 @@ unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
return 5;
}
/* Neat trick to map patch type back to the call within the
* corresponding structure. */
DEFINE_STATIC_KEY_TRUE(virt_spin_lock_key);
void __init native_pv_lock_init(void)
{
if (!static_cpu_has(X86_FEATURE_HYPERVISOR))
static_branch_disable(&virt_spin_lock_key);
}
/*
* Neat trick to map patch type back to the call within the
* corresponding structure.
*/
static void *get_call_destination(u8 type)
{
struct paravirt_patch_template tmpl = {

5
arch/x86/kernel/smpboot.c
Просмотреть файл

@ -77,6 +77,7 @@
#include <asm/i8259.h>
#include <asm/realmode.h>
#include <asm/misc.h>
#include <asm/qspinlock.h>
/* Number of siblings per CPU package */
int smp_num_siblings = 1;
@ -1095,7 +1096,7 @@ int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
unsigned long flags;
int err, ret = 0;
WARN_ON(irqs_disabled());
lockdep_assert_irqs_enabled();
pr_debug("++++++++++++++++++++=_---CPU UP %u\n", cpu);
@ -1358,6 +1359,8 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
pr_info("CPU0: ");
print_cpu_info(&cpu_data(0));
native_pv_lock_init();
uv_system_init();
set_mtrr_aps_delayed_init();

4
arch/x86/kvm/mmu.c
Просмотреть файл

@ -443,7 +443,7 @@ static u64 __update_clear_spte_slow(u64 *sptep, u64 spte)
static u64 __get_spte_lockless(u64 *sptep)
{
return ACCESS_ONCE(*sptep);
return READ_ONCE(*sptep);
}
#else
union split_spte {
@ -4819,7 +4819,7 @@ static void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
* If we don't have indirect shadow pages, it means no page is
* write-protected, so we can exit simply.
*/
if (!ACCESS_ONCE(vcpu->kvm->arch.indirect_shadow_pages))
if (!READ_ONCE(vcpu->kvm->arch.indirect_shadow_pages))
return;
remote_flush = local_flush = false;

2
arch/x86/kvm/page_track.c
Просмотреть файл

@ -157,7 +157,7 @@ bool kvm_page_track_is_active(struct kvm_vcpu *vcpu, gfn_t gfn,
return false;
index = gfn_to_index(gfn, slot->base_gfn, PT_PAGE_TABLE_LEVEL);
return !!ACCESS_ONCE(slot->arch.gfn_track[mode][index]);
return !!READ_ONCE(slot->arch.gfn_track[mode][index]);
}
void kvm_page_track_cleanup(struct kvm *kvm)

12
arch/x86/lib/rwsem.S
Просмотреть файл

@ -98,6 +98,18 @@ ENTRY(call_rwsem_down_read_failed)
ret
ENDPROC(call_rwsem_down_read_failed)
ENTRY(call_rwsem_down_read_failed_killable)
FRAME_BEGIN
save_common_regs
__ASM_SIZE(push,) %__ASM_REG(dx)
movq %rax,%rdi
call rwsem_down_read_failed_killable
__ASM_SIZE(pop,) %__ASM_REG(dx)
restore_common_regs
FRAME_END
ret
ENDPROC(call_rwsem_down_read_failed_killable)
ENTRY(call_rwsem_down_write_failed)
FRAME_BEGIN
save_common_regs

7
arch/x86/mm/extable.c
Просмотреть файл

@ -67,12 +67,17 @@ bool ex_handler_refcount(const struct exception_table_entry *fixup,
* wrapped around) will be set. Additionally, seeing the refcount
* reach 0 will set ZF (Zero Flag: result was zero). In each of
* these cases we want a report, since it's a boundary condition.
*
* The SF case is not reported since it indicates post-boundary
* manipulations below zero or above INT_MAX. And if none of the
* flags are set, something has gone very wrong, so report it.
*/
if (regs->flags & (X86_EFLAGS_OF | X86_EFLAGS_ZF)) {
bool zero = regs->flags & X86_EFLAGS_ZF;
refcount_error_report(regs, zero ? "hit zero" : "overflow");
} else if ((regs->flags & X86_EFLAGS_SF) == 0) {
/* Report if none of OF, ZF, nor SF are set. */
refcount_error_report(regs, "unexpected saturation");
}
return true;

2
arch/x86/xen/p2m.c
Просмотреть файл

@ -547,7 +547,7 @@ int xen_alloc_p2m_entry(unsigned long pfn)
if (p2m_top_mfn && pfn < MAX_P2M_PFN) {
topidx = p2m_top_index(pfn);
top_mfn_p = &p2m_top_mfn[topidx];
mid_mfn = ACCESS_ONCE(p2m_top_mfn_p[topidx]);
mid_mfn = READ_ONCE(p2m_top_mfn_p[topidx]);
BUG_ON(virt_to_mfn(mid_mfn) != *top_mfn_p);

6
arch/x86/xen/spinlock.c
Просмотреть файл

@ -11,6 +11,7 @@
#include <linux/slab.h>
#include <asm/paravirt.h>
#include <asm/qspinlock.h>
#include <xen/interface/xen.h>
#include <xen/events.h>
@ -81,8 +82,11 @@ void xen_init_lock_cpu(int cpu)
int irq;
char *name;
if (!xen_pvspin)
if (!xen_pvspin) {
if (cpu == 0)
static_branch_disable(&virt_spin_lock_key);
return;
}
WARN(per_cpu(lock_kicker_irq, cpu) >= 0, "spinlock on CPU%d exists on IRQ%d!\n",
cpu, per_cpu(lock_kicker_irq, cpu));

7
arch/xtensa/include/asm/spinlock.h
Просмотреть файл

@ -33,8 +33,6 @@
#define arch_spin_is_locked(x) ((x)->slock != 0)
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
static inline void arch_spin_lock(arch_spinlock_t *lock)
{
unsigned long tmp;
@ -97,8 +95,6 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock)
* 0x80000000 one writer owns the rwlock, no other writers, no readers
*/
#define arch_write_can_lock(x) ((x)->lock == 0)
static inline void arch_write_lock(arch_rwlock_t *rw)
{
unsigned long tmp;
@ -200,7 +196,4 @@ static inline void arch_read_unlock(arch_rwlock_t *rw)
: "memory");
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#endif /* _XTENSA_SPINLOCK_H */

14
arch/xtensa/platforms/xtfpga/lcd.c
Просмотреть файл

@ -34,23 +34,23 @@
static void lcd_put_byte(u8 *addr, u8 data)
{
#ifdef CONFIG_XTFPGA_LCD_8BIT_ACCESS
ACCESS_ONCE(*addr) = data;
WRITE_ONCE(*addr, data);
#else
ACCESS_ONCE(*addr) = data & 0xf0;
ACCESS_ONCE(*addr) = (data << 4) & 0xf0;
WRITE_ONCE(*addr, data & 0xf0);
WRITE_ONCE(*addr, (data << 4) & 0xf0);
#endif
}
static int __init lcd_init(void)
{
ACCESS_ONCE(*LCD_INSTR_ADDR) = LCD_DISPLAY_MODE8BIT;
WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE8BIT);
mdelay(5);
ACCESS_ONCE(*LCD_INSTR_ADDR) = LCD_DISPLAY_MODE8BIT;
WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE8BIT);
udelay(200);
ACCESS_ONCE(*LCD_INSTR_ADDR) = LCD_DISPLAY_MODE8BIT;
WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE8BIT);
udelay(50);
#ifndef CONFIG_XTFPGA_LCD_8BIT_ACCESS
ACCESS_ONCE(*LCD_INSTR_ADDR) = LCD_DISPLAY_MODE4BIT;
WRITE_ONCE(*LCD_INSTR_ADDR, LCD_DISPLAY_MODE4BIT);
udelay(50);
lcd_put_byte(LCD_INSTR_ADDR, LCD_DISPLAY_MODE4BIT);
udelay(50);

19
block/bio.c
Просмотреть файл

@ -917,17 +917,9 @@ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
}
EXPORT_SYMBOL_GPL(bio_iov_iter_get_pages);
struct submit_bio_ret {
struct completion event;
int error;
};
static void submit_bio_wait_endio(struct bio *bio)
{
struct submit_bio_ret *ret = bio->bi_private;
ret->error = blk_status_to_errno(bio->bi_status);
complete(&ret->event);
complete(bio->bi_private);
}
/**
@ -943,16 +935,15 @@ static void submit_bio_wait_endio(struct bio *bio)
*/
int submit_bio_wait(struct bio *bio)
{
struct submit_bio_ret ret;
DECLARE_COMPLETION_ONSTACK_MAP(done, bio->bi_disk->lockdep_map);
init_completion(&ret.event);
bio->bi_private = &ret;
bio->bi_private = &done;
bio->bi_end_io = submit_bio_wait_endio;
bio->bi_opf |= REQ_SYNC;
submit_bio(bio);
wait_for_completion_io(&ret.event);
wait_for_completion_io(&done);
return ret.error;
return blk_status_to_errno(bio->bi_status);
}
EXPORT_SYMBOL(submit_bio_wait);

2
block/blk-wbt.c
Просмотреть файл

@ -261,7 +261,7 @@ static inline bool stat_sample_valid(struct blk_rq_stat *stat)
static u64 rwb_sync_issue_lat(struct rq_wb *rwb)
{
u64 now, issue = ACCESS_ONCE(rwb->sync_issue);
u64 now, issue = READ_ONCE(rwb->sync_issue);
if (!issue || !rwb->sync_cookie)
return 0;

10
block/genhd.c
Просмотреть файл

@ -1354,13 +1354,7 @@ dev_t blk_lookup_devt(const char *name, int partno)
}
EXPORT_SYMBOL(blk_lookup_devt);
struct gendisk *alloc_disk(int minors)
{
return alloc_disk_node(minors, NUMA_NO_NODE);
}
EXPORT_SYMBOL(alloc_disk);
struct gendisk *alloc_disk_node(int minors, int node_id)
struct gendisk *__alloc_disk_node(int minors, int node_id)
{
struct gendisk *disk;
struct disk_part_tbl *ptbl;
@ -1411,7 +1405,7 @@ struct gendisk *alloc_disk_node(int minors, int node_id)
}
return disk;
}
EXPORT_SYMBOL(alloc_disk_node);
EXPORT_SYMBOL(__alloc_disk_node);
struct kobject *get_disk(struct gendisk *disk)
{

2
drivers/base/core.c
Просмотреть файл

@ -668,7 +668,7 @@ const char *dev_driver_string(const struct device *dev)
* so be careful about accessing it. dev->bus and dev->class should
* never change once they are set, so they don't need special care.
*/
drv = ACCESS_ONCE(dev->driver);
drv = READ_ONCE(dev->driver);
return drv ? drv->name :
(dev->bus ? dev->bus->name :
(dev->class ? dev->class->name : ""));

4
drivers/base/power/runtime.c
Просмотреть файл

@ -134,11 +134,11 @@ unsigned long pm_runtime_autosuspend_expiration(struct device *dev)
if (!dev->power.use_autosuspend)
goto out;
autosuspend_delay = ACCESS_ONCE(dev->power.autosuspend_delay);
autosuspend_delay = READ_ONCE(dev->power.autosuspend_delay);
if (autosuspend_delay < 0)
goto out;
last_busy = ACCESS_ONCE(dev->power.last_busy);
last_busy = READ_ONCE(dev->power.last_busy);
elapsed = jiffies - last_busy;
if (elapsed < 0)
goto out; /* jiffies has wrapped around. */

4
drivers/char/random.c
Просмотреть файл

@ -641,7 +641,7 @@ static void credit_entropy_bits(struct entropy_store *r, int nbits)
return;
retry:
entropy_count = orig = ACCESS_ONCE(r->entropy_count);
entropy_count = orig = READ_ONCE(r->entropy_count);
if (nfrac < 0) {
/* Debit */
entropy_count += nfrac;
@ -1265,7 +1265,7 @@ static size_t account(struct entropy_store *r, size_t nbytes, int min,
/* Can we pull enough? */
retry:
entropy_count = orig = ACCESS_ONCE(r->entropy_count);
entropy_count = orig = READ_ONCE(r->entropy_count);
ibytes = nbytes;
/* never pull more than available */
have_bytes = entropy_count >> (ENTROPY_SHIFT + 3);

2
drivers/clocksource/bcm2835_timer.c
Просмотреть файл

@ -71,7 +71,7 @@ static irqreturn_t bcm2835_time_interrupt(int irq, void *dev_id)
if (readl_relaxed(timer->control) & timer->match_mask) {
writel_relaxed(timer->match_mask, timer->control);
event_handler = ACCESS_ONCE(timer->evt.event_handler);
event_handler = READ_ONCE(timer->evt.event_handler);
if (event_handler)
event_handler(&timer->evt);
return IRQ_HANDLED;

4
drivers/crypto/caam/jr.c
Просмотреть файл

@ -172,7 +172,7 @@ static void caam_jr_dequeue(unsigned long devarg)
while (rd_reg32(&jrp->rregs->outring_used)) {
head = ACCESS_ONCE(jrp->head);
head = READ_ONCE(jrp->head);
spin_lock(&jrp->outlock);
@ -341,7 +341,7 @@ int caam_jr_enqueue(struct device *dev, u32 *desc,
spin_lock_bh(&jrp->inplock);
head = jrp->head;
tail = ACCESS_ONCE(jrp->tail);
tail = READ_ONCE(jrp->tail);
if (!rd_reg32(&jrp->rregs->inpring_avail) ||
CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) {

2
drivers/crypto/nx/nx-842-powernv.c
Просмотреть файл

@ -193,7 +193,7 @@ static int wait_for_csb(struct nx842_workmem *wmem,
ktime_t start = wmem->start, now = ktime_get();
ktime_t timeout = ktime_add_ms(start, CSB_WAIT_MAX);
while (!(ACCESS_ONCE(csb->flags) & CSB_V)) {
while (!(READ_ONCE(csb->flags) & CSB_V)) {
cpu_relax();
now = ktime_get();
if (ktime_after(now, timeout))

10
drivers/edac/altera_edac.c
Просмотреть файл

@ -175,11 +175,11 @@ static ssize_t altr_sdr_mc_err_inject_write(struct file *file,
/*
* To trigger the error, we need to read the data back
* (the data was written with errors above).
* The ACCESS_ONCE macros and printk are used to prevent the
* The READ_ONCE macros and printk are used to prevent the
* the compiler optimizing these reads out.
*/
reg = ACCESS_ONCE(ptemp[0]);
read_reg = ACCESS_ONCE(ptemp[1]);
reg = READ_ONCE(ptemp[0]);
read_reg = READ_ONCE(ptemp[1]);
/* Force Read */
rmb();
@ -618,7 +618,7 @@ static ssize_t altr_edac_device_trig(struct file *file,
for (i = 0; i < (priv->trig_alloc_sz / sizeof(*ptemp)); i++) {
/* Read data so we're in the correct state */
rmb();
if (ACCESS_ONCE(ptemp[i]))
if (READ_ONCE(ptemp[i]))
result = -1;
/* Toggle Error bit (it is latched), leave ECC enabled */
writel(error_mask, (drvdata->base + priv->set_err_ofst));
@ -635,7 +635,7 @@ static ssize_t altr_edac_device_trig(struct file *file,
/* Read out written data. ECC error caused here */
for (i = 0; i < ALTR_TRIGGER_READ_WRD_CNT; i++)
if (ACCESS_ONCE(ptemp[i]) != i)
if (READ_ONCE(ptemp[i]) != i)
edac_printk(KERN_ERR, EDAC_DEVICE,
"Read doesn't match written data\n");

10
drivers/firewire/ohci.c
Просмотреть файл

@ -734,7 +734,7 @@ static unsigned int ar_search_last_active_buffer(struct ar_context *ctx,
__le16 res_count, next_res_count;
i = ar_first_buffer_index(ctx);
res_count = ACCESS_ONCE(ctx->descriptors[i].res_count);
res_count = READ_ONCE(ctx->descriptors[i].res_count);
/* A buffer that is not yet completely filled must be the last one. */
while (i != last && res_count == 0) {
@ -742,8 +742,7 @@ static unsigned int ar_search_last_active_buffer(struct ar_context *ctx,
/* Peek at the next descriptor. */
next_i = ar_next_buffer_index(i);
rmb(); /* read descriptors in order */
next_res_count = ACCESS_ONCE(
ctx->descriptors[next_i].res_count);
next_res_count = READ_ONCE(ctx->descriptors[next_i].res_count);
/*
* If the next descriptor is still empty, we must stop at this
* descriptor.
@ -759,8 +758,7 @@ static unsigned int ar_search_last_active_buffer(struct ar_context *ctx,
if (MAX_AR_PACKET_SIZE > PAGE_SIZE && i != last) {
next_i = ar_next_buffer_index(next_i);
rmb();
next_res_count = ACCESS_ONCE(
ctx->descriptors[next_i].res_count);
next_res_count = READ_ONCE(ctx->descriptors[next_i].res_count);
if (next_res_count != cpu_to_le16(PAGE_SIZE))
goto next_buffer_is_active;
}
@ -2812,7 +2810,7 @@ static int handle_ir_buffer_fill(struct context *context,
u32 buffer_dma;
req_count = le16_to_cpu(last->req_count);
res_count = le16_to_cpu(ACCESS_ONCE(last->res_count));
res_count = le16_to_cpu(READ_ONCE(last->res_count));
completed = req_count - res_count;
buffer_dma = le32_to_cpu(last->data_address);

24
drivers/firmware/tegra/ivc.c
Просмотреть файл

@ -99,11 +99,11 @@ static inline bool tegra_ivc_empty(struct tegra_ivc *ivc,
{
/*
* This function performs multiple checks on the same values with
* security implications, so create snapshots with ACCESS_ONCE() to
* security implications, so create snapshots with READ_ONCE() to
* ensure that these checks use the same values.
*/
u32 tx = ACCESS_ONCE(header->tx.count);
u32 rx = ACCESS_ONCE(header->rx.count);
u32 tx = READ_ONCE(header->tx.count);
u32 rx = READ_ONCE(header->rx.count);
/*
* Perform an over-full check to prevent denial of service attacks
@ -124,8 +124,8 @@ static inline bool tegra_ivc_empty(struct tegra_ivc *ivc,
static inline bool tegra_ivc_full(struct tegra_ivc *ivc,
struct tegra_ivc_header *header)
{
u32 tx = ACCESS_ONCE(header->tx.count);
u32 rx = ACCESS_ONCE(header->rx.count);
u32 tx = READ_ONCE(header->tx.count);
u32 rx = READ_ONCE(header->rx.count);
/*
* Invalid cases where the counters indicate that the queue is over
@ -137,8 +137,8 @@ static inline bool tegra_ivc_full(struct tegra_ivc *ivc,
static inline u32 tegra_ivc_available(struct tegra_ivc *ivc,
struct tegra_ivc_header *header)
{
u32 tx = ACCESS_ONCE(header->tx.count);
u32 rx = ACCESS_ONCE(header->rx.count);
u32 tx = READ_ONCE(header->tx.count);
u32 rx = READ_ONCE(header->rx.count);
/*
* This function isn't expected to be used in scenarios where an
@ -151,8 +151,8 @@ static inline u32 tegra_ivc_available(struct tegra_ivc *ivc,
static inline void tegra_ivc_advance_tx(struct tegra_ivc *ivc)
{
ACCESS_ONCE(ivc->tx.channel->tx.count) =
ACCESS_ONCE(ivc->tx.channel->tx.count) + 1;
WRITE_ONCE(ivc->tx.channel->tx.count,
READ_ONCE(ivc->tx.channel->tx.count) + 1);
if (ivc->tx.position == ivc->num_frames - 1)
ivc->tx.position = 0;
@ -162,8 +162,8 @@ static inline void tegra_ivc_advance_tx(struct tegra_ivc *ivc)
static inline void tegra_ivc_advance_rx(struct tegra_ivc *ivc)
{
ACCESS_ONCE(ivc->rx.channel->rx.count) =
ACCESS_ONCE(ivc->rx.channel->rx.count) + 1;
WRITE_ONCE(ivc->rx.channel->rx.count,
READ_ONCE(ivc->rx.channel->rx.count) + 1);
if (ivc->rx.position == ivc->num_frames - 1)
ivc->rx.position = 0;
@ -428,7 +428,7 @@ int tegra_ivc_notified(struct tegra_ivc *ivc)
/* Copy the receiver's state out of shared memory. */
tegra_ivc_invalidate(ivc, ivc->rx.phys + offset);
state = ACCESS_ONCE(ivc->rx.channel->tx.state);
state = READ_ONCE(ivc->rx.channel->tx.state);
if (state == TEGRA_IVC_STATE_SYNC) {
offset = offsetof(struct tegra_ivc_header, tx.count);

4
drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
Просмотреть файл

@ -260,7 +260,7 @@ static void amdgpu_fence_fallback(unsigned long arg)
*/
int amdgpu_fence_wait_empty(struct amdgpu_ring *ring)
{
uint64_t seq = ACCESS_ONCE(ring->fence_drv.sync_seq);
uint64_t seq = READ_ONCE(ring->fence_drv.sync_seq);
struct dma_fence *fence, **ptr;
int r;
@ -300,7 +300,7 @@ unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
amdgpu_fence_process(ring);
emitted = 0x100000000ull;
emitted -= atomic_read(&ring->fence_drv.last_seq);
emitted += ACCESS_ONCE(ring->fence_drv.sync_seq);
emitted += READ_ONCE(ring->fence_drv.sync_seq);
return lower_32_bits(emitted);
}

4
drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
Просмотреть файл

@ -788,11 +788,11 @@ static int amdgpu_debugfs_gem_bo_info(int id, void *ptr, void *data)
seq_printf(m, "\t0x%08x: %12ld byte %s",
id, amdgpu_bo_size(bo), placement);
offset = ACCESS_ONCE(bo->tbo.mem.start);
offset = READ_ONCE(bo->tbo.mem.start);
if (offset != AMDGPU_BO_INVALID_OFFSET)
seq_printf(m, " @ 0x%010Lx", offset);
pin_count = ACCESS_ONCE(bo->pin_count);
pin_count = READ_ONCE(bo->pin_count);
if (pin_count)
seq_printf(m, " pin count %d", pin_count);
seq_printf(m, "\n");

2
drivers/gpu/drm/amd/scheduler/gpu_scheduler.c
Просмотреть файл

@ -187,7 +187,7 @@ static bool amd_sched_entity_is_ready(struct amd_sched_entity *entity)
if (kfifo_is_empty(&entity->job_queue))
return false;
if (ACCESS_ONCE(entity->dependency))
if (READ_ONCE(entity->dependency))
return false;
return true;

4
drivers/gpu/drm/radeon/radeon_gem.c
Просмотреть файл

@ -451,7 +451,7 @@ int radeon_gem_busy_ioctl(struct drm_device *dev, void *data,
else
r = 0;
cur_placement = ACCESS_ONCE(robj->tbo.mem.mem_type);
cur_placement = READ_ONCE(robj->tbo.mem.mem_type);
args->domain = radeon_mem_type_to_domain(cur_placement);
drm_gem_object_put_unlocked(gobj);
return r;
@ -481,7 +481,7 @@ int radeon_gem_wait_idle_ioctl(struct drm_device *dev, void *data,
r = ret;
/* Flush HDP cache via MMIO if necessary */
cur_placement = ACCESS_ONCE(robj->tbo.mem.mem_type);
cur_placement = READ_ONCE(robj->tbo.mem.mem_type);
if (rdev->asic->mmio_hdp_flush &&
radeon_mem_type_to_domain(cur_placement) == RADEON_GEM_DOMAIN_VRAM)
robj->rdev->asic->mmio_hdp_flush(rdev);

2
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
Просмотреть файл

@ -904,7 +904,7 @@ vmw_surface_handle_reference(struct vmw_private *dev_priv,
if (unlikely(drm_is_render_client(file_priv)))
require_exist = true;
if (ACCESS_ONCE(vmw_fpriv(file_priv)->locked_master)) {
if (READ_ONCE(vmw_fpriv(file_priv)->locked_master)) {
DRM_ERROR("Locked master refused legacy "
"surface reference.\n");
return -EACCES;

2
drivers/infiniband/hw/hfi1/file_ops.c
Просмотреть файл

@ -380,7 +380,7 @@ static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
if (sc->flags & SCF_FROZEN) {
wait_event_interruptible_timeout(
dd->event_queue,
!(ACCESS_ONCE(dd->flags) & HFI1_FROZEN),
!(READ_ONCE(dd->flags) & HFI1_FROZEN),
msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
if (dd->flags & HFI1_FROZEN)
return -ENOLCK;

6
drivers/infiniband/hw/hfi1/pio.c
Просмотреть файл

@ -1423,14 +1423,14 @@ retry:
goto done;
}
/* copy from receiver cache line and recalculate */
sc->alloc_free = ACCESS_ONCE(sc->free);
sc->alloc_free = READ_ONCE(sc->free);
avail =
(unsigned long)sc->credits -
(sc->fill - sc->alloc_free);
if (blocks > avail) {
/* still no room, actively update */
sc_release_update(sc);
sc->alloc_free = ACCESS_ONCE(sc->free);
sc->alloc_free = READ_ONCE(sc->free);
trycount++;
goto retry;
}
@ -1667,7 +1667,7 @@ void sc_release_update(struct send_context *sc)
/* call sent buffer callbacks */
code = -1; /* code not yet set */
head = ACCESS_ONCE(sc->sr_head); /* snapshot the head */
head = READ_ONCE(sc->sr_head); /* snapshot the head */
tail = sc->sr_tail;
while (head != tail) {
pbuf = &sc->sr[tail].pbuf;

2
drivers/infiniband/hw/hfi1/ruc.c
Просмотреть файл

@ -363,7 +363,7 @@ static void ruc_loopback(struct rvt_qp *sqp)
again:
smp_read_barrier_depends(); /* see post_one_send() */
if (sqp->s_last == ACCESS_ONCE(sqp->s_head))
if (sqp->s_last == READ_ONCE(sqp->s_head))
goto clr_busy;
wqe = rvt_get_swqe_ptr(sqp, sqp->s_last);

8
drivers/infiniband/hw/hfi1/sdma.c
Просмотреть файл

@ -1725,7 +1725,7 @@ retry:
swhead = sde->descq_head & sde->sdma_mask;
/* this code is really bad for cache line trading */
swtail = ACCESS_ONCE(sde->descq_tail) & sde->sdma_mask;
swtail = READ_ONCE(sde->descq_tail) & sde->sdma_mask;
cnt = sde->descq_cnt;
if (swhead < swtail)
@ -1872,7 +1872,7 @@ retry:
if ((status & sde->idle_mask) && !idle_check_done) {
u16 swtail;
swtail = ACCESS_ONCE(sde->descq_tail) & sde->sdma_mask;
swtail = READ_ONCE(sde->descq_tail) & sde->sdma_mask;
if (swtail != hwhead) {
hwhead = (u16)read_sde_csr(sde, SD(HEAD));
idle_check_done = 1;
@ -2222,7 +2222,7 @@ void sdma_seqfile_dump_sde(struct seq_file *s, struct sdma_engine *sde)
u16 len;
head = sde->descq_head & sde->sdma_mask;
tail = ACCESS_ONCE(sde->descq_tail) & sde->sdma_mask;
tail = READ_ONCE(sde->descq_tail) & sde->sdma_mask;
seq_printf(s, SDE_FMT, sde->this_idx,
sde->cpu,
sdma_state_name(sde->state.current_state),
@ -3305,7 +3305,7 @@ int sdma_ahg_alloc(struct sdma_engine *sde)
return -EINVAL;
}
while (1) {
nr = ffz(ACCESS_ONCE(sde->ahg_bits));
nr = ffz(READ_ONCE(sde->ahg_bits));
if (nr > 31) {
trace_hfi1_ahg_allocate(sde, -ENOSPC);
return -ENOSPC;

2
drivers/infiniband/hw/hfi1/sdma.h
Просмотреть файл

@ -445,7 +445,7 @@ static inline u16 sdma_descq_freecnt(struct sdma_engine *sde)
{
return sde->descq_cnt -
(sde->descq_tail -
ACCESS_ONCE(sde->descq_head)) - 1;
READ_ONCE(sde->descq_head)) - 1;
}
static inline u16 sdma_descq_inprocess(struct sdma_engine *sde)

4
drivers/infiniband/hw/hfi1/uc.c
Просмотреть файл

@ -80,7 +80,7 @@ int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
goto bail;
/* We are in the error state, flush the work request. */
smp_read_barrier_depends(); /* see post_one_send() */
if (qp->s_last == ACCESS_ONCE(qp->s_head))
if (qp->s_last == READ_ONCE(qp->s_head))
goto bail;
/* If DMAs are in progress, we can't flush immediately. */
if (iowait_sdma_pending(&priv->s_iowait)) {
@ -121,7 +121,7 @@ int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
goto bail;
/* Check if send work queue is empty. */
smp_read_barrier_depends(); /* see post_one_send() */
if (qp->s_cur == ACCESS_ONCE(qp->s_head)) {
if (qp->s_cur == READ_ONCE(qp->s_head)) {
clear_ahg(qp);
goto bail;
}

4
drivers/infiniband/hw/hfi1/ud.c
Просмотреть файл

@ -487,7 +487,7 @@ int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
goto bail;
/* We are in the error state, flush the work request. */
smp_read_barrier_depends(); /* see post_one_send */
if (qp->s_last == ACCESS_ONCE(qp->s_head))
if (qp->s_last == READ_ONCE(qp->s_head))
goto bail;
/* If DMAs are in progress, we can't flush immediately. */
if (iowait_sdma_pending(&priv->s_iowait)) {
@ -501,7 +501,7 @@ int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
/* see post_one_send() */
smp_read_barrier_depends();
if (qp->s_cur == ACCESS_ONCE(qp->s_head))
if (qp->s_cur == READ_ONCE(qp->s_head))
goto bail;
wqe = rvt_get_swqe_ptr(qp, qp->s_cur);

8
drivers/infiniband/hw/hfi1/user_sdma.c
Просмотреть файл

@ -276,7 +276,7 @@ int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd,
/* Wait until all requests have been freed. */
wait_event_interruptible(
pq->wait,
(ACCESS_ONCE(pq->state) == SDMA_PKT_Q_INACTIVE));
(READ_ONCE(pq->state) == SDMA_PKT_Q_INACTIVE));
kfree(pq->reqs);
kfree(pq->req_in_use);
kmem_cache_destroy(pq->txreq_cache);
@ -591,7 +591,7 @@ int hfi1_user_sdma_process_request(struct hfi1_filedata *fd,
if (ret != -EBUSY) {
req->status = ret;
WRITE_ONCE(req->has_error, 1);
if (ACCESS_ONCE(req->seqcomp) ==
if (READ_ONCE(req->seqcomp) ==
req->seqsubmitted - 1)
goto free_req;
return ret;
@ -825,7 +825,7 @@ static int user_sdma_send_pkts(struct user_sdma_request *req, unsigned maxpkts)
*/
if (req->data_len) {
iovec = &req->iovs[req->iov_idx];
if (ACCESS_ONCE(iovec->offset) == iovec->iov.iov_len) {
if (READ_ONCE(iovec->offset) == iovec->iov.iov_len) {
if (++req->iov_idx == req->data_iovs) {
ret = -EFAULT;
goto free_txreq;
@ -1390,7 +1390,7 @@ static void user_sdma_txreq_cb(struct sdma_txreq *txreq, int status)
} else {
if (status != SDMA_TXREQ_S_OK)
req->status = status;
if (req->seqcomp == (ACCESS_ONCE(req->seqsubmitted) - 1) &&
if (req->seqcomp == (READ_ONCE(req->seqsubmitted) - 1) &&
(READ_ONCE(req->done) ||
READ_ONCE(req->has_error))) {
user_sdma_free_request(req, false);

2
drivers/infiniband/hw/qib/qib_ruc.c
Просмотреть файл

@ -368,7 +368,7 @@ static void qib_ruc_loopback(struct rvt_qp *sqp)
again:
smp_read_barrier_depends(); /* see post_one_send() */
if (sqp->s_last == ACCESS_ONCE(sqp->s_head))
if (sqp->s_last == READ_ONCE(sqp->s_head))
goto clr_busy;
wqe = rvt_get_swqe_ptr(sqp, sqp->s_last);

4
drivers/infiniband/hw/qib/qib_uc.c
Просмотреть файл

@ -61,7 +61,7 @@ int qib_make_uc_req(struct rvt_qp *qp, unsigned long *flags)
goto bail;
/* We are in the error state, flush the work request. */
smp_read_barrier_depends(); /* see post_one_send() */
if (qp->s_last == ACCESS_ONCE(qp->s_head))
if (qp->s_last == READ_ONCE(qp->s_head))
goto bail;
/* If DMAs are in progress, we can't flush immediately. */
if (atomic_read(&priv->s_dma_busy)) {
@ -91,7 +91,7 @@ int qib_make_uc_req(struct rvt_qp *qp, unsigned long *flags)
goto bail;
/* Check if send work queue is empty. */
smp_read_barrier_depends(); /* see post_one_send() */
if (qp->s_cur == ACCESS_ONCE(qp->s_head))
if (qp->s_cur == READ_ONCE(qp->s_head))
goto bail;
/*
* Start a new request.

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