0,0 → 1,61 |
#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) |
#define __always_inline inline __attribute__((always_inline)) |
|
/* |
* 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 |