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Merge up to 2.4.26

#ifndef __LINUX_COMPILER_H
#define __LINUX_COMPILER_H

/* Somewhere in the middle of the GCC 2.96 development cycle, we implemented
   a mechanism by which the user can annotate likely branch directions and
   expect the blocks to be reordered appropriately.  Define __builtin_expect
   to nothing for earlier compilers.  */

#if __GNUC__ == 2 && __GNUC_MINOR__ < 96
#define __builtin_expect(x, expected_value) (x)
#endif

#define likely(x)	__builtin_expect((x),1)
#define unlikely(x)	__builtin_expect((x),0)

#if __GNUC__ > 3
#define __attribute_used__	__attribute((__used__))
#elif __GNUC__ == 3
#if  __GNUC_MINOR__ >= 3
# define __attribute_used__	__attribute__((__used__))
#else
# define __attribute_used__	__attribute__((__unused__))
#endif /* __GNUC_MINOR__ >= 3 */
#elif __GNUC__ == 2
#define __attribute_used__	__attribute__((__unused__))
#else
#define __attribute_used__	/* not implemented */
#endif /* __GNUC__ */

#endif /* __LINUX_COMPILER_H */