5ba840f9da
commitec2212088c"Disintegrate asm/system.h for Alpha" combined with commitb4816afa39"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>
72 lines
1.7 KiB
C
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 */
|