linux/arch/alpha/include/asm/cmpxchg.h
Paul Gortmaker 5ba840f9da alpha: fix build failures from system.h dismemberment
commit ec2212088c

    "Disintegrate asm/system.h for Alpha"

combined with commit b4816afa39

    "Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h"

introduced the concept of asm/cmpxchg.h but the alpha arch
never got one.  Fork the cmpxchg content out of the asm/atomic.h
file to create one.

Some minor whitespace fixups were done on the block of code that
created the new file.

Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Acked-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2012-04-13 13:15:16 -04:00

72 lines
1.7 KiB
C

#ifndef _ALPHA_CMPXCHG_H
#define _ALPHA_CMPXCHG_H
/*
* Atomic exchange routines.
*/
#define __ASM__MB
#define ____xchg(type, args...) __xchg ## type ## _local(args)
#define ____cmpxchg(type, args...) __cmpxchg ## type ## _local(args)
#include <asm/xchg.h>
#define xchg_local(ptr, x) \
({ \
__typeof__(*(ptr)) _x_ = (x); \
(__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_, \
sizeof(*(ptr))); \
})
#define cmpxchg_local(ptr, o, n) \
({ \
__typeof__(*(ptr)) _o_ = (o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
(unsigned long)_n_, \
sizeof(*(ptr))); \
})
#define cmpxchg64_local(ptr, o, n) \
({ \
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
cmpxchg_local((ptr), (o), (n)); \
})
#ifdef CONFIG_SMP
#undef __ASM__MB
#define __ASM__MB "\tmb\n"
#endif
#undef ____xchg
#undef ____cmpxchg
#define ____xchg(type, args...) __xchg ##type(args)
#define ____cmpxchg(type, args...) __cmpxchg ##type(args)
#include <asm/xchg.h>
#define xchg(ptr, x) \
({ \
__typeof__(*(ptr)) _x_ = (x); \
(__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, \
sizeof(*(ptr))); \
})
#define cmpxchg(ptr, o, n) \
({ \
__typeof__(*(ptr)) _o_ = (o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
(unsigned long)_n_, sizeof(*(ptr)));\
})
#define cmpxchg64(ptr, o, n) \
({ \
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
cmpxchg((ptr), (o), (n)); \
})
#undef __ASM__MB
#undef ____cmpxchg
#define __HAVE_ARCH_CMPXCHG 1
#endif /* _ALPHA_CMPXCHG_H */