| #ifndef __LINUX_COMPILER_H |
| #error "Please don't include <linux/compiler-gcc5.h> directly, include <linux/compiler.h> instead." |
| #endif |
| |
| #include <linux/version.h> |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,18,0) |
| #include_next <linux/compiler-gcc5.h> |
| #else |
| |
| #define __used __attribute__((__used__)) |
| #define __must_check __attribute__((warn_unused_result)) |
| #define __compiler_offsetof(a, b) __builtin_offsetof(a, b) |
| |
| /* 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__)) |
| |
| #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) |
| |
| #ifndef __CHECKER__ |
| # define __compiletime_warning(message) __attribute__((warning(message))) |
| # define __compiletime_error(message) __attribute__((error(message))) |
| #endif /* __CHECKER__ */ |
| |
| /* |
| * 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() |
| |
| /* Mark a function definition as prohibited from being cloned. */ |
| #define __noclone __attribute__((__noclone__)) |
| |
| /* |
| * Tell the optimizer that something else uses this function or variable. |
| */ |
| #define __visible __attribute__((externally_visible)) |
| |
| /* |
| * GCC 'asm goto' miscompiles certain code sequences: |
| * |
| * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 |
| * |
| * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. |
| * Fixed in GCC 4.8.2 and later versions. |
| * |
| * (asm goto is automatically volatile - the naming reflects this.) |
| */ |
| #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) |
| |
| #ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP |
| #define __HAVE_BUILTIN_BSWAP32__ |
| #define __HAVE_BUILTIN_BSWAP64__ |
| #define __HAVE_BUILTIN_BSWAP16__ |
| #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ |
| #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */ |