7ea50d5284
gcc allows extensions to be non compiler specific by defining __* macros for the attributes supported by gcc. Having a different definition causes many warnings during the build (cdefs.h on FreeBSD uses __attribute((__pure__)) where u-boot uses __attribute__((pure)) for example). Do not redefine these macros to suppress these warnings. This patch ignores the checkpatch warning: WARNING: __packed is preferred over __attribute__((packed)) Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
#ifndef __LINUX_COMPILER_H
|
|
#error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
|
|
#endif
|
|
|
|
/* GCC 4.1.[01] miscompiles __weak */
|
|
#ifdef __KERNEL__
|
|
# if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
|
|
# error Your version of gcc miscompiles the __weak directive
|
|
# endif
|
|
#endif
|
|
|
|
#define __used __attribute__((__used__))
|
|
#define __must_check __attribute__((warn_unused_result))
|
|
#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
|
|
#ifndef __always_inline
|
|
# define __always_inline inline __attribute__((always_inline))
|
|
#endif
|
|
|
|
/*
|
|
* A trick to suppress uninitialized variable warning without generating any
|
|
* code
|
|
*/
|
|
#define uninitialized_var(x) x = x
|
|
|
|
#if __GNUC_MINOR__ >= 3
|
|
/* Mark functions as cold. gcc will assume any path leading to a call
|
|
to them will be unlikely. This means a lot of manual unlikely()s
|
|
are unnecessary now for any paths leading to the usual suspects
|
|
like BUG(), printk(), panic() etc. [but let's keep them for now for
|
|
older compilers]
|
|
|
|
Early snapshots of gcc 4.3 don't support this and we can't detect this
|
|
in the preprocessor, but we can live with this because they're unreleased.
|
|
Maketime probing would be overkill here.
|
|
|
|
gcc also has a __attribute__((__hot__)) to move hot functions into
|
|
a special section, but I don't see any sense in this right now in
|
|
the kernel context */
|
|
#define __cold __attribute__((__cold__))
|
|
|
|
|
|
#if __GNUC_MINOR__ >= 5
|
|
/*
|
|
* Mark a position in code as unreachable. This can be used to
|
|
* suppress control flow warnings after asm blocks that transfer
|
|
* control elsewhere.
|
|
*
|
|
* Early snapshots of gcc 4.5 don't support this and we can't detect
|
|
* this in the preprocessor, but we can live with this because they're
|
|
* unreleased. Really, we need to have autoconf for the kernel.
|
|
*/
|
|
#define unreachable() __builtin_unreachable()
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#if __GNUC_MINOR__ > 0
|
|
#define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
|
|
#endif
|
|
#if __GNUC_MINOR__ >= 4
|
|
#define __compiletime_warning(message) __attribute__((warning(message)))
|
|
#define __compiletime_error(message) __attribute__((error(message)))
|
|
#endif
|