[linux-2.6-block.git] / include / linux / compiler-gcc.h

/* Never include this file directly.  Include <linux/compiler.h> instead.  */

/*
 * Common definitions for all gcc versions go here.
 */


/* Optimization barrier */
/* The "volatile" is due to gcc bugs */
#define barrier() __asm__ __volatile__("": : :"memory")

/* This macro obfuscates arithmetic on a variable address so that gcc
   shouldn't recognize the original var, and make assumptions about it */
#define RELOC_HIDE(ptr, off)					\
  ({ unsigned long __ptr;					\
    __asm__ ("" : "=g"(__ptr) : "0"(ptr));		\
    (typeof(ptr)) (__ptr + (off)); })
Commit	Line	Data
1da177e4 LT	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)); })