Linus Torvalds ca15561c99 asm-generic: qspinlock: fix queued_spin_value_unlocked() implementation ... [ Upstream commit 125b0bb95dd6bec81b806b997a4ccb026eeecf8f ] We really don't want to do atomic_read() or anything like that, since we already have the value, not the lock. The whole point of this is that we've loaded the lock from memory, and we want to check whether the value we loaded was a locked one or not. The main use of this is the lockref code, which loads both the lock and the reference count in one atomic operation, and then works on that combined value. With the atomic_read(), the compiler would pointlessly spill the value to the stack, in order to then be able to read it back "atomically". This is the qspinlock version of commit c6f4a9002252 ("asm-generic: ticket-lock: Optimize arch_spin_value_unlocked()") which fixed this same bug for ticket locks. Cc: Guo Ren <guoren@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Waiman Long <longman@redhat.com> Link: https://lore.kernel.org/all/CAHk-=whNRv0v6kQiV5QO6DJhjH4KEL36vWQ6Re8Csrnh4zbRkQ@mail.gmail.com/ Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-12-20 15:17:40 +01:00
..
bitops	locking/atomic: Make test_and_*_bit() ordered on failure	2022-08-25 11:39:54 +02:00
vdso	lib/vdso: Avoid highres update if clocksource is not VDSO capable	2020-02-17 20:12:17 +01:00
Kbuild	Rework of the X86 irq stack handling:	2021-02-24 16:32:23 -08:00
asm-offsets.h	…
asm-prototypes.h	…
atomic.h	locking/atomic: delete !ARCH_ATOMIC remnants	2021-05-26 13:20:52 +02:00
atomic64.h	locking/atomic: delete !ARCH_ATOMIC remnants	2021-05-26 13:20:52 +02:00
audit_change_attr.h	…
audit_dir_write.h	…
audit_read.h	…
audit_signal.h	…
audit_write.h	…
barrier.h	compiler.h: fix barrier_data() on clang	2020-11-14 11:26:03 -08:00
bitops.h	asm-generic/bitops: Update stale comment	2020-03-06 11:06:19 +01:00
bitsperlong.h	lib: extend the scope of small_const_nbits() macro	2021-05-06 19:24:11 -07:00
bug.h	Merge branch 'akpm' (patches from Andrew)	2021-07-02 12:08:10 -07:00
cache.h	…
cacheflush.h	make asm-generic/cacheflush.h more standalone	2020-06-26 00:27:37 -07:00
checksum.h	unify generic instances of csum_partial_copy_nocheck()	2020-08-20 15:45:14 -04:00
cmpxchg-local.h	locking/atomic: cmpxchg: make `generic` a prefix	2021-05-26 13:20:50 +02:00
cmpxchg.h	locking/atomic: delete !ARCH_ATOMIC remnants	2021-05-26 13:20:52 +02:00
compat.h	compat: make linux/compat.h available everywhere	2021-07-23 14:20:24 +01:00
current.h	…
delay.h	…
device.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428	2019-06-05 17:37:16 +02:00
div64.h	ARM: 9117/1: asm-generic: div64: Remove always-true __div64_const32_is_OK()	2021-08-20 11:39:28 +01:00
dma-mapping.h	…
dma.h	…
early_ioremap.h	mm/early_ioremap.c: remove redundant early_ioremap_shutdown()	2021-09-08 11:50:24 -07:00
emergency-restart.h	…
error-injection.h	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
exec.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36	2019-05-24 17:27:11 +02:00
export.h	asm-generic: export: Stub EXPORT_SYMBOL with __DISABLE_EXPORTS	2021-02-03 16:42:57 +00:00
extable.h	…
fb.h	…
fixmap.h	mm: introduce common STRUCT_PAGE_MAX_SHIFT define	2018-12-14 15:05:45 -08:00
flat.h	binfmt_flat: remove the persistent argument from flat_get_addr_from_rp	2019-06-24 09:16:47 +10:00
ftrace.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
futex.h	generic arch_futex_atomic_op_inuser() doesn't need access_ok()	2020-03-27 23:58:55 -04:00
getorder.h	asm-generic: force inlining of get_order() to work around gcc10 poor decision	2020-12-15 22:46:15 -08:00
gpio.h	gpio: Avoid kernel.h inclusion where it's possible	2020-02-10 12:58:36 +01:00
hardirq.h	irqstat: Move declaration into asm-generic/hardirq.h	2020-11-23 10:31:06 +01:00
hugetlb.h	mm: Allow arches to provide ptep_get()	2020-06-20 22:14:53 +10:00
hw_irq.h	…
hyperv-tlfs.h	asm-generic/hyperv: add HV_STATUS_ACCESS_DENIED definition	2021-06-17 13:09:38 -04:00
ide_iops.h	…
int-ll64.h	…
io.h	asm-generic/io.h: suppress endianness warnings for readq() and writeq()	2023-05-11 23:00:15 +09:00
ioctl.h	…
iomap.h	parisc: Declare pci_iounmap() parisc version only when CONFIG_PCI enabled	2021-09-19 10:36:09 -07:00
irq.h	…
irq_regs.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
irq_work.h	…
irqflags.h	…
kdebug.h	…
kmap_size.h	mm/highmem: Provide and use CONFIG_DEBUG_KMAP_LOCAL	2020-11-24 14:42:08 +01:00
kprobes.h	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
kvm_para.h	…
kvm_types.h	KVM: Move x86's version of struct kvm_mmu_memory_cache to common code	2020-07-09 13:29:42 -04:00
linkage.h	…
local.h	…
local64.h	…
logic_io.h	lib: add iomem emulation (logic_iomem)	2021-06-17 21:44:51 +02:00
mcs_spinlock.h	…
memory_model.h	mm: remove CONFIG_DISCONTIGMEM	2021-06-29 10:53:55 -07:00
mm_hooks.h	mm: remove arch_bprm_mm_init() hook	2020-01-23 10:41:16 -08:00
mmiowb.h	asm-generic/mmiowb: Allow mmiowb_set_pending() when preemptible()	2020-07-17 10:02:03 +01:00
mmiowb_types.h	asm-generic/mmiowb: Add generic implementation of mmiowb() tracking	2019-04-08 11:59:39 +01:00
mmu.h	…
mmu_context.h	asm-generic: add generic MMU versions of mmu context functions	2020-10-26 16:45:03 +01:00
module.h	…
module.lds.h	kbuild: preprocess module linker script	2020-09-25 00:36:41 +09:00
mshyperv.h	hyperv-fixes for 5.15-rc2	2021-09-15 17:18:56 -07:00
msi.h	Generic interrupt and irqchips subsystem:	2020-12-15 15:03:31 -08:00
nommu_context.h	asm-generic: add generic MMU versions of mmu context functions	2020-10-26 16:45:03 +01:00
numa.h	numa: Move numa implementation to common code	2021-01-14 15:08:55 -08:00
page.h	c6x: remove architecture	2021-01-20 09:30:45 +01:00
param.h	…
parport.h	…
pci.h	…
pci_iomap.h	parisc: Declare pci_iounmap() parisc version only when CONFIG_PCI enabled	2021-09-19 10:36:09 -07:00
percpu.h	asm-generic: percpu: avoid Wshadow warning	2020-10-26 23:54:48 +00:00
pgalloc.h	asm-generic: pgalloc.h: use correct #ifdef to enable pud_alloc_one()	2020-08-14 19:56:55 -07:00
pgtable-nop4d.h	mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t *	2021-07-08 11:48:22 -07:00
pgtable-nopmd.h	mm: rename pud_page_vaddr to pud_pgtable and make it return pmd_t *	2021-07-08 11:48:22 -07:00
pgtable-nopud.h	mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t *	2021-07-08 11:48:22 -07:00
pgtable_uffd.h	userfaultfd: wp: add pmd_swp_*uffd_wp() helpers	2020-04-07 10:43:39 -07:00
preempt.h	sched/core: Initialize the idle task with preemption disabled	2021-05-12 13:01:45 +02:00
qrwlock.h	locking/arch: Move qrwlock.h include after qspinlock.h	2021-02-11 07:59:54 -05:00
qrwlock_types.h	…
qspinlock.h	asm-generic: qspinlock: fix queued_spin_value_unlocked() implementation	2023-12-20 15:17:40 +01:00
qspinlock_types.h	locking/qspinlock: Do not include atomic.h from qspinlock_types.h	2020-07-29 16:14:19 +02:00
resource.h	…
rwonce.h	asm/rwonce: Don't pull <asm/barrier.h> into 'asm-generic/rwonce.h'	2020-07-21 10:50:36 +01:00
seccomp.h	seccomp: Use -1 marker for end of mode 1 syscall list	2020-07-10 16:01:52 -07:00
sections.h	asm-generic: sections: refactor memory_intersects	2022-08-31 17:16:47 +02:00
serial.h	…
set_memory.h	…
shmparam.h	treewide: remove SPDX "WITH Linux-syscall-note" from kernel-space headers	2019-05-14 19:52:48 -07:00
signal.h	…
simd.h	…
softirq_stack.h	softirq: Move do_softirq_own_stack() to generic asm header	2021-02-10 23:34:16 +01:00
spinlock.h	…
statfs.h	…
string.h	…
switch_to.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36	2019-05-24 17:27:11 +02:00
syscall.h	audit: Migrate to use SYSCALL_WORK flag	2020-11-16 21:53:16 +01:00
syscalls.h	…
termios-base.h	…
termios.h	…
timex.h	…
tlb.h	mm/khugepaged: fix GUP-fast interaction by sending IPI	2022-12-14 11:37:17 +01:00
tlbflush.h	…
topology.h	mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA	2021-06-29 10:53:55 -07:00
trace_clock.h	…
uaccess.h	asm-generic: uaccess: remove inline strncpy_from_user/strnlen_user	2021-07-27 23:01:13 +02:00
unaligned.h	asm-generic: simplify asm/unaligned.h	2021-05-17 13:30:29 +02:00
user.h	…
vermagic.h	arch: split MODULE_ARCH_VERMAGIC definitions out to <asm/vermagic.h>	2020-04-23 10:50:26 +09:00
vga.h	…
vmlinux.lds.h	arch: fix broken BuildID for arm64 and riscv	2023-03-17 08:49:03 +01:00
vtime.h	…
word-at-a-time.h	word-at-a-time: use the same return type for has_zero regardless of endianness	2023-08-11 15:13:49 +02:00
xor.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 47	2019-05-24 17:27:13 +02:00