Remove various things which were checking for gcc-1.x and gcc-2.x compilers.

From: Adrian Bunk <bunk@stusta.de>

    Some documentation updates and removes some code paths for gcc < 3.2.

Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andrew Morton 2006-01-08 01:04:09 -08:00 коммит произвёл Linus Torvalds
Родитель fd285bb54d
Коммит a136564702
32 изменённых файлов: 37 добавлений и 194 удалений

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@ -31,8 +31,6 @@ al espa
Eine deutsche Version dieser Datei finden Sie unter
<http://www.stefan-winter.de/Changes-2.4.0.txt>.
Last updated: October 29th, 2002
Chris Ricker (kaboom@gatech.edu or chris.ricker@genetics.utah.edu).
Current Minimal Requirements
@ -48,7 +46,7 @@ necessary on all systems; obviously, if you don't have any ISDN
hardware, for example, you probably needn't concern yourself with
isdn4k-utils.
o Gnu C 2.95.3 # gcc --version
o Gnu C 3.2 # gcc --version
o Gnu make 3.79.1 # make --version
o binutils 2.12 # ld -v
o util-linux 2.10o # fdformat --version
@ -74,26 +72,7 @@ GCC
---
The gcc version requirements may vary depending on the type of CPU in your
computer. The next paragraph applies to users of x86 CPUs, but not
necessarily to users of other CPUs. Users of other CPUs should obtain
information about their gcc version requirements from another source.
The recommended compiler for the kernel is gcc 2.95.x (x >= 3), and it
should be used when you need absolute stability. You may use gcc 3.0.x
instead if you wish, although it may cause problems. Later versions of gcc
have not received much testing for Linux kernel compilation, and there are
almost certainly bugs (mainly, but not exclusively, in the kernel) that
will need to be fixed in order to use these compilers. In any case, using
pgcc instead of plain gcc is just asking for trouble.
The Red Hat gcc 2.96 compiler subtree can also be used to build this tree.
You should ensure you use gcc-2.96-74 or later. gcc-2.96-54 will not build
the kernel correctly.
In addition, please pay attention to compiler optimization. Anything
greater than -O2 may not be wise. Similarly, if you choose to use gcc-2.95.x
or derivatives, be sure not to use -fstrict-aliasing (which, depending on
your version of gcc 2.95.x, may necessitate using -fno-strict-aliasing).
computer.
Make
----
@ -322,9 +301,9 @@ Getting updated software
Kernel compilation
******************
gcc 2.95.3
----------
o <ftp://ftp.gnu.org/gnu/gcc/gcc-2.95.3.tar.gz>
gcc
---
o <ftp://ftp.gnu.org/gnu/gcc/>
Make
----

7
README
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@ -183,11 +183,8 @@ CONFIGURING the kernel:
COMPILING the kernel:
- Make sure you have gcc 2.95.3 available.
gcc 2.91.66 (egcs-1.1.2), and gcc 2.7.2.3 are known to miscompile
some parts of the kernel, and are *no longer supported*.
Also remember to upgrade your binutils package (for as/ld/nm and company)
if necessary. For more information, refer to Documentation/Changes.
- Make sure you have at least gcc 3.2 available.
For more information, refer to Documentation/Changes.
Please note that you can still run a.out user programs with this kernel.

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@ -23,20 +23,15 @@
#error Sorry, your compiler targets APCS-26 but this kernel requires APCS-32
#endif
/*
* GCC 2.95.1, 2.95.2: ignores register clobber list in asm().
* GCC 3.0, 3.1: general bad code generation.
* GCC 3.2.0: incorrect function argument offset calculation.
* GCC 3.2.x: miscompiles NEW_AUX_ENT in fs/binfmt_elf.c
* (http://gcc.gnu.org/PR8896) and incorrect structure
* initialisation in fs/jffs2/erase.c
*/
#if __GNUC__ < 2 || \
(__GNUC__ == 2 && __GNUC_MINOR__ < 95) || \
(__GNUC__ == 2 && __GNUC_MINOR__ == 95 && __GNUC_PATCHLEVEL__ != 0 && \
__GNUC_PATCHLEVEL__ < 3) || \
(__GNUC__ == 3 && __GNUC_MINOR__ < 3)
#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
#error Your compiler is too buggy; it is known to miscompile kernels.
#error Known good compilers: 2.95.3, 2.95.4, 2.96, 3.3
#error Known good compilers: 3.3
#endif
/* Use marker if you need to separate the values later */

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@ -25,13 +25,6 @@
#if defined(__APCS_32__) && defined(CONFIG_CPU_26)
#error Sorry, your compiler targets APCS-32 but this kernel requires APCS-26
#endif
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 95)
#error Sorry, your compiler is known to miscompile kernels. Only use gcc 2.95.3 and later.
#endif
#if __GNUC__ == 2 && __GNUC_MINOR__ == 95
/* shame we can't detect the .1 or .2 releases */
#warning GCC 2.95.2 and earlier miscompiles kernels.
#endif
/* Use marker if you need to separate the values later */

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@ -630,10 +630,6 @@ config REGPARM
and passes the first three arguments of a function call in registers.
This will probably break binary only modules.
This feature is only enabled for gcc-3.0 and later - earlier compilers
generate incorrect output with certain kernel constructs when
-mregparm=3 is used.
config SECCOMP
bool "Enable seccomp to safely compute untrusted bytecode"
depends on PROC_FS

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@ -37,10 +37,7 @@ CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
# CPU-specific tuning. Anything which can be shared with UML should go here.
include $(srctree)/arch/i386/Makefile.cpu
# -mregparm=3 works ok on gcc-3.0 and later
#
GCC_VERSION := $(call cc-version)
cflags-$(CONFIG_REGPARM) += $(shell if [ $(GCC_VERSION) -ge 0300 ] ; then echo "-mregparm=3"; fi ;)
cflags-$(CONFIG_REGPARM) += -mregparm=3
# Disable unit-at-a-time mode, it makes gcc use a lot more stack
# due to the lack of sharing of stacklots.

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@ -1,7 +1,7 @@
# CPU tuning section - shared with UML.
# Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML.
#-mtune exists since gcc 3.4, and some -mcpu flavors didn't exist in gcc 2.95.
#-mtune exists since gcc 3.4
HAS_MTUNE := $(call cc-option-yn, -mtune=i386)
ifeq ($(HAS_MTUNE),y)
tune = $(call cc-option,-mtune=$(1),)
@ -14,7 +14,7 @@ cflags-$(CONFIG_M386) += -march=i386
cflags-$(CONFIG_M486) += -march=i486
cflags-$(CONFIG_M586) += -march=i586
cflags-$(CONFIG_M586TSC) += -march=i586
cflags-$(CONFIG_M586MMX) += $(call cc-option,-march=pentium-mmx,-march=i586)
cflags-$(CONFIG_M586MMX) += -march=pentium-mmx
cflags-$(CONFIG_M686) += -march=i686
cflags-$(CONFIG_MPENTIUMII) += -march=i686 $(call tune,pentium2)
cflags-$(CONFIG_MPENTIUMIII) += -march=i686 $(call tune,pentium3)
@ -23,8 +23,8 @@ cflags-$(CONFIG_MPENTIUM4) += -march=i686 $(call tune,pentium4)
cflags-$(CONFIG_MK6) += -march=k6
# Please note, that patches that add -march=athlon-xp and friends are pointless.
# They make zero difference whatsosever to performance at this time.
cflags-$(CONFIG_MK7) += $(call cc-option,-march=athlon,-march=i686 $(align)-functions=4)
cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,$(call cc-option,-march=athlon,-march=i686 $(align)-functions=4))
cflags-$(CONFIG_MK7) += -march=athlon
cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon)
cflags-$(CONFIG_MCRUSOE) += -march=i686 $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586)
@ -37,5 +37,5 @@ cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686)
cflags-$(CONFIG_X86_ELAN) += -march=i486
# Geode GX1 support
cflags-$(CONFIG_MGEODEGX1) += $(call cc-option,-march=pentium-mmx,-march=i486)
cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx

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@ -37,10 +37,6 @@ $(error Sorry, you need a newer version of the assember, one that is built from
ftp://ftp.hpl.hp.com/pub/linux-ia64/gas-030124.tar.gz)
endif
ifneq ($(shell if [ $(GCC_VERSION) -lt 0300 ] ; then echo "bad"; fi ;),)
$(error Sorry, your compiler is too old. GCC v2.96 is known to generate bad code.)
endif
ifeq ($(GCC_VERSION),0304)
cflags-$(CONFIG_ITANIUM) += -mtune=merced
cflags-$(CONFIG_MCKINLEY) += -mtune=mckinley

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@ -1060,7 +1060,7 @@ SET_REG(b5);
* the clobber lists for spin_lock() in include/asm-ia64/spinlock.h.
*/
#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
GLOBAL_ENTRY(ia64_spinlock_contention_pre3_4)
.prologue

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@ -103,7 +103,7 @@ EXPORT_SYMBOL(unw_init_running);
#ifdef ASM_SUPPORTED
# ifdef CONFIG_SMP
# if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
# if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
/*
* This is not a normal routine and we don't want a function descriptor for it, so we use
* a fake declaration here.

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@ -32,7 +32,7 @@ typedef struct
u64 *prev_pfs_loc; /* state for WAR for old spinlock ool code */
} ia64_backtrace_t;
#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
/*
* Returns non-zero if the PC is in the spinlock contention out-of-line code
* with non-standard calling sequence (on older compilers).

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@ -306,9 +306,6 @@ static int raid0_run (mddev_t *mddev)
printk("raid0 : conf->hash_spacing is %llu blocks.\n",
(unsigned long long)conf->hash_spacing);
{
#if __GNUC__ < 3
volatile
#endif
sector_t s = mddev->array_size;
sector_t space = conf->hash_spacing;
int round;
@ -439,9 +436,6 @@ static int raid0_make_request (request_queue_t *q, struct bio *bio)
{
#if __GNUC__ < 3
volatile
#endif
sector_t x = block >> conf->preshift;
sector_div(x, (u32)conf->hash_spacing);
zone = conf->hash_table[x];

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@ -191,9 +191,7 @@ char *v4l2_type_names[] = {
};
char *v4l2_ioctl_names[256] = {
#if __GNUC__ >= 3
[0 ... 255] = "UNKNOWN",
#endif
[_IOC_NR(VIDIOC_QUERYCAP)] = "VIDIOC_QUERYCAP",
[_IOC_NR(VIDIOC_RESERVED)] = "VIDIOC_RESERVED",
[_IOC_NR(VIDIOC_ENUM_FMT)] = "VIDIOC_ENUM_FMT",

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@ -212,11 +212,10 @@ extern struct mlog_bits mlog_and_bits, mlog_not_bits;
mlog(ML_ENTRY, "ENTRY:\n"); \
} while (0)
/* We disable this for old compilers since they don't have support for
* __builtin_types_compatible_p.
/*
* We disable this for sparse.
*/
#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)) && \
!defined(__CHECKER__)
#if !defined(__CHECKER__)
#define mlog_exit(st) do { \
if (__builtin_types_compatible_p(typeof(st), unsigned long)) \
mlog(ML_EXIT, "EXIT: %lu\n", (unsigned long) (st)); \

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@ -30,13 +30,7 @@
* By comparing each compnent, we don't have to worry about extra
* endian issues in treating two 32 bit numbers as one 64 bit number
*/
static
#if defined(__GNUC__) && (__GNUC__ == 2) && ( (__GNUC_MINOR__ == 95) || (__GNUC_MINOR__ == 96))
__attribute__((unused)) /* gcc 2.95, 2.96 miscompile this when inlined */
#else
__inline__
#endif
xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
{
if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;

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@ -98,9 +98,7 @@
#undef inline
#undef __inline__
#undef __inline
#if __GNUC__ == 3 && __GNUC_MINOR__ >= 1 || __GNUC__ > 3
#undef __always_inline
#define __always_inline inline __attribute__((always_inline))
#endif
#endif /* __ALPHA_COMPILER_H */

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@ -77,7 +77,6 @@ unsigned long get_wchan(struct task_struct *p);
#define spin_lock_prefetch(lock) do { } while (0)
#endif
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
extern inline void prefetch(const void *ptr)
{
__builtin_prefetch(ptr, 0, 3);
@ -95,24 +94,4 @@ extern inline void spin_lock_prefetch(const void *ptr)
}
#endif
#else
extern inline void prefetch(const void *ptr)
{
__asm__ ("ldl $31,%0" : : "m"(*(char *)ptr));
}
extern inline void prefetchw(const void *ptr)
{
__asm__ ("ldq $31,%0" : : "m"(*(char *)ptr));
}
#ifdef CONFIG_SMP
extern inline void spin_lock_prefetch(const void *ptr)
{
__asm__ ("ldq $31,%0" : : "m"(*(char *)ptr));
}
#endif
#endif /* GCC 3.1 */
#endif /* __ASM_ALPHA_PROCESSOR_H */

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@ -2,11 +2,7 @@
#define _ASM_IA64_BUG_H
#ifdef CONFIG_BUG
#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
# define ia64_abort() __builtin_trap()
#else
# define ia64_abort() (*(volatile int *) 0 = 0)
#endif
#define ia64_abort() __builtin_trap()
#define BUG() do { printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); ia64_abort(); } while (0)
/* should this BUG be made generic? */

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@ -34,7 +34,7 @@ __raw_spin_lock_flags (raw_spinlock_t *lock, unsigned long flags)
{
register volatile unsigned int *ptr asm ("r31") = &lock->lock;
#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
# ifdef CONFIG_ITANIUM
/* don't use brl on Itanium... */
asm volatile ("{\n\t"

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@ -193,11 +193,7 @@ do { \
* not preserve it's value. Hairy, but it lets us remove 2 loads
* and 2 stores in this critical code path. -DaveM
*/
#if __GNUC__ >= 3
#define EXTRA_CLOBBER ,"%l1"
#else
#define EXTRA_CLOBBER
#endif
#define switch_to(prev, next, last) \
do { if (test_thread_flag(TIF_PERFCTR)) { \
unsigned long __tmp; \

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@ -1,10 +1,6 @@
#ifndef __UM_RWSEM_H__
#define __UM_RWSEM_H__
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
#define __builtin_expect(exp,c) (exp)
#endif
#include "asm/arch/rwsem.h"
#endif

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@ -241,9 +241,6 @@
/* User programs sometimes end up including this header file
(indirectly, via uClibc header files), so I'm a bit nervous just
including <linux/compiler.h>. */
#if !defined(__builtin_expect) && __GNUC__ == 2 && __GNUC_MINOR__ < 96
#define __builtin_expect(x, expected_value) (x)
#endif
#define __syscall_return(type, res) \
do { \
@ -346,20 +343,6 @@ type name (atype a, btype b, ctype c, dtype d, etype e) \
__syscall_return (type, __ret); \
}
#if __GNUC__ < 3
/* In older versions of gcc, `asm' statements with more than 10
input/output arguments produce a fatal error. To work around this
problem, we use two versions, one for gcc-3.x and one for earlier
versions of gcc (the `earlier gcc' version doesn't work with gcc-3.x
because gcc-3.x doesn't allow clobbers to also be input arguments). */
#define __SYSCALL6_TRAP(syscall, ret, a, b, c, d, e, f) \
__asm__ __volatile__ ("trap " SYSCALL_LONG_TRAP \
: "=r" (ret), "=r" (syscall) \
: "1" (syscall), \
"r" (a), "r" (b), "r" (c), "r" (d), \
"r" (e), "r" (f) \
: SYSCALL_CLOBBERS, SYSCALL_ARG4, SYSCALL_ARG5);
#else /* __GNUC__ >= 3 */
#define __SYSCALL6_TRAP(syscall, ret, a, b, c, d, e, f) \
__asm__ __volatile__ ("trap " SYSCALL_LONG_TRAP \
: "=r" (ret), "=r" (syscall), \
@ -368,7 +351,6 @@ type name (atype a, btype b, ctype c, dtype d, etype e) \
"r" (a), "r" (b), "r" (c), "r" (d), \
"2" (e), "3" (f) \
: SYSCALL_CLOBBERS);
#endif
#define _syscall6(type, name, atype, a, btype, b, ctype, c, dtype, d, etype, e, ftype, f) \
type name (atype a, btype b, ctype c, dtype d, etype e, ftype f) \

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@ -156,7 +156,7 @@ extern __be32 htonl(__u32);
extern __u16 ntohs(__be16);
extern __be16 htons(__u16);
#if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)
#if defined(__GNUC__) && defined(__OPTIMIZE__)
#define ___htonl(x) __cpu_to_be32(x)
#define ___htons(x) __cpu_to_be16(x)

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@ -110,7 +110,7 @@
/*
* Allow constant folding
*/
#if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)
#if defined(__GNUC__) && defined(__OPTIMIZE__)
# define __swab16(x) \
(__builtin_constant_p((__u16)(x)) ? \
___swab16((x)) : \

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@ -77,7 +77,7 @@
/*
* Allow constant folding
*/
#if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)
#if defined(__GNUC__) && defined(__OPTIMIZE__)
# define __swahw32(x) \
(__builtin_constant_p((__u32)(x)) ? \
___swahw32((x)) : \

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@ -15,3 +15,12 @@
({ unsigned long __ptr; \
__asm__ ("" : "=g"(__ptr) : "0"(ptr)); \
(typeof(ptr)) (__ptr + (off)); })
#define inline inline __attribute__((always_inline))
#define __inline__ __inline__ __attribute__((always_inline))
#define __inline __inline __attribute__((always_inline))
#define __deprecated __attribute__((deprecated))
#define noinline __attribute__((noinline))
#define __attribute_pure__ __attribute__((pure))
#define __attribute_const__ __attribute__((__const__))

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@ -3,29 +3,12 @@
/* These definitions are for GCC v3.x. */
#include <linux/compiler-gcc.h>
#if __GNUC_MINOR__ >= 1
# define inline inline __attribute__((always_inline))
# define __inline__ __inline__ __attribute__((always_inline))
# define __inline __inline __attribute__((always_inline))
#endif
#if __GNUC_MINOR__ > 0
# define __deprecated __attribute__((deprecated))
#endif
#if __GNUC_MINOR__ >= 3
# define __attribute_used__ __attribute__((__used__))
#else
# define __attribute_used__ __attribute__((__unused__))
#endif
#define __attribute_pure__ __attribute__((pure))
#define __attribute_const__ __attribute__((__const__))
#if __GNUC_MINOR__ >= 1
#define noinline __attribute__((noinline))
#endif
#if __GNUC_MINOR__ >= 4
#define __must_check __attribute__((warn_unused_result))
#endif

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@ -3,14 +3,7 @@
/* These definitions are for GCC v4.x. */
#include <linux/compiler-gcc.h>
#define inline inline __attribute__((always_inline))
#define __inline__ __inline__ __attribute__((always_inline))
#define __inline __inline __attribute__((always_inline))
#define __deprecated __attribute__((deprecated))
#define __attribute_used__ __attribute__((__used__))
#define __attribute_pure__ __attribute__((pure))
#define __attribute_const__ __attribute__((__const__))
#define noinline __attribute__((noinline))
#define __must_check __attribute__((warn_unused_result))
#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)

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@ -316,8 +316,6 @@ extern int randomize_va_space;
#endif
/* Trap pasters of __FUNCTION__ at compile-time */
#if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
#define __FUNCTION__ (__func__)
#endif
#endif

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@ -26,11 +26,7 @@ static inline int has_secure_computing(struct thread_info *ti)
#else /* CONFIG_SECCOMP */
#if (__GNUC__ > 2)
typedef struct { } seccomp_t;
#else
typedef struct { int gcc_is_buggy; } seccomp_t;
#endif
typedef struct { } seccomp_t;
#define secure_computing(x) do { } while (0)
/* static inline to preserve typechecking */

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@ -22,30 +22,16 @@ typedef struct {
#else
/*
* All gcc 2.95 versions and early versions of 2.96 have a nasty bug
* with empty initializers.
*/
#if (__GNUC__ > 2)
typedef struct { } raw_spinlock_t;
#define __RAW_SPIN_LOCK_UNLOCKED { }
#else
typedef struct { int gcc_is_buggy; } raw_spinlock_t;
#define __RAW_SPIN_LOCK_UNLOCKED (raw_spinlock_t) { 0 }
#endif
#endif
#if (__GNUC__ > 2)
typedef struct {
/* no debug version on UP */
} raw_rwlock_t;
#define __RAW_RW_LOCK_UNLOCKED { }
#else
typedef struct { int gcc_is_buggy; } raw_rwlock_t;
#define __RAW_RW_LOCK_UNLOCKED (raw_rwlock_t) { 0 }
#endif
#endif /* __LINUX_SPINLOCK_TYPES_UP_H */

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@ -115,18 +115,11 @@ MODULE_PARM_DESC(osrun_time, "how many seconds to wait for the ICS2115 OS");
#ifdef WF_DEBUG
#if defined(NEW_MACRO_VARARGS) || __GNUC__ >= 3
#define DPRINT(cond, ...) \
if ((dev->debug & (cond)) == (cond)) { \
snd_printk (__VA_ARGS__); \
}
#else
#define DPRINT(cond, args...) \
if ((dev->debug & (cond)) == (cond)) { \
snd_printk (args); \
}
#endif
#else
#define DPRINT(cond, args...)
#endif /* WF_DEBUG */