include/linux/compiler-gcc4.h

   1 /* Never include this file directly.  Include <linux/compiler.h> instead.  */
   2
   3 /* These definitions are for GCC v4.x.  */
   4 #include <linux/compiler-gcc.h>
   5
   6 #ifdef CONFIG_FORCED_INLINING
   7 # undef inline
   8 # undef __inline__
   9 # undef __inline
  10 # define inline                 inline          __attribute__((always_inline))
  11 # define __inline__             __inline__      __attribute__((always_inline))
  12 # define __inline               __inline        __attribute__((always_inline))
  13 #endif
  14
  15 #define __used                  __attribute__((__used__))
  16 #define __attribute_used__      __used                  /* deprecated */
  17 #define __must_check            __attribute__((warn_unused_result))
  18 #define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
  19 #define __always_inline         inline __attribute__((always_inline))
  20
  21 /*
  22  * A trick to suppress uninitialized variable warning without generating any
  23  * code
  24  */
  25 #define uninitialized_var(x) x = x
  26
  27 #if !(__GNUC__ == 4 && __GNUC_MINOR__ < 3)
  28 /* Mark functions as cold. gcc will assume any path leading to a call
  29    to them will be unlikely.  This means a lot of manual unlikely()s
  30    are unnecessary now for any paths leading to the usual suspects
  31    like BUG(), printk(), panic() etc. [but let's keep them for now for
  32    older compilers]
  33
  34    Early snapshots of gcc 4.3 don't support this and we can't detect this
  35    in the preprocessor, but we can live with this because they're unreleased.
  36    Maketime probing would be overkill here.
  37
  38    gcc also has a __attribute__((__hot__)) to move hot functions into
  39    a special section, but I don't see any sense in this right now in
  40    the kernel context */
  41 #define __cold                  __attribute__((__cold__))
  42
  43 #endif