include/linux/compiler-gcc4.h

   1 #ifndef __LINUX_COMPILER_H
   2 #error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
   3 #endif
   4
   5 /* These definitions are for GCC v4.x.  */
   6 #include <linux/compiler-gcc.h>
   7
   8 #ifdef CONFIG_FORCED_INLINING
   9 # undef inline
  10 # undef __inline__
  11 # undef __inline
  12 # define inline                 inline          __attribute__((always_inline))
  13 # define __inline__             __inline__      __attribute__((always_inline))
  14 # define __inline               __inline        __attribute__((always_inline))
  15 #endif
  16
  17 #define __used                  __attribute__((__used__))
  18 #define __must_check            __attribute__((warn_unused_result))
  19 #define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
  20 #define __always_inline         inline __attribute__((always_inline))
  21
  22 /*
  23  * A trick to suppress uninitialized variable warning without generating any
  24  * code
  25  */
  26 #define uninitialized_var(x) x = x
  27
  28 #if !(__GNUC__ == 4 && __GNUC_MINOR__ < 3)
  29 /* Mark functions as cold. gcc will assume any path leading to a call
  30    to them will be unlikely.  This means a lot of manual unlikely()s
  31    are unnecessary now for any paths leading to the usual suspects
  32    like BUG(), printk(), panic() etc. [but let's keep them for now for
  33    older compilers]
  34
  35    Early snapshots of gcc 4.3 don't support this and we can't detect this
  36    in the preprocessor, but we can live with this because they're unreleased.
  37    Maketime probing would be overkill here.
  38
  39    gcc also has a __attribute__((__hot__)) to move hot functions into
  40    a special section, but I don't see any sense in this right now in
  41    the kernel context */
  42 #define __cold                  __attribute__((__cold__))
  43
  44 #endif