tools/lib/lockdep/uinclude/linux/compiler.h - pub/scm/linux/kernel/git/linusw/linux-gpio - Git at Google

 #ifndef _LIBLOCKDEP_LINUX_COMPILER_H_
 #define _LIBLOCKDEP_LINUX_COMPILER_H_

 #define __used		__attribute__((__unused__))
 #define unlikely

 #endif
	#ifndef _LIBLOCKDEP_LINUX_COMPILER_H_
	#define _LIBLOCKDEP_LINUX_COMPILER_H_

	#define __used __attribute__((__unused__))
	#define unlikely

	#endif