include/linux/compiler-gcc.h

   1 /* Never include this file directly.  Include <linux/compiler.h> instead.  */
   2
   3 /*
   4  * Common definitions for all gcc versions go here.
   5  */
   6
   7
   8 /* Optimization barrier */
   9 /* The "volatile" is due to gcc bugs */
  10 #define barrier() __asm__ __volatile__("": : :"memory")
  11
  12 /* This macro obfuscates arithmetic on a variable address so that gcc
  13    shouldn't recognize the original var, and make assumptions about it */
  14 #define RELOC_HIDE(ptr, off)                                    \
  15   ({ unsigned long __ptr;                                       \
  16     __asm__ ("" : "=g"(__ptr) : "0"(ptr));              \
  17     (typeof(ptr)) (__ptr + (off)); })