提交 027bcc27 编写于 作者: M Mathieu Desnoyers 提交者: Linus Torvalds

Add cmpxchg_local to m68knommu

Use the new generic cmpxchg_local (disables interrupt). Also use the generic
cmpxchg as fallback if SMP is not set.
Signed-off-by: NMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 5da75103
......@@ -186,26 +186,20 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
}
#endif
#include <asm-generic/cmpxchg-local.h>
/*
* Atomic compare and exchange. Compare OLD with MEM, if identical,
* store NEW in MEM. Return the initial value in MEM. Success is
* indicated by comparing RETURN with OLD.
* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
* them available.
*/
#define __HAVE_ARCH_CMPXCHG 1
static __inline__ unsigned long
cmpxchg(volatile int *p, int old, int new)
{
unsigned long flags;
int prev;
local_irq_save(flags);
if ((prev = *p) == old)
*p = new;
local_irq_restore(flags);
return(prev);
}
#define cmpxchg_local(ptr, o, n) \
((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
(unsigned long)(n), sizeof(*(ptr))))
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
#ifndef CONFIG_SMP
#include <asm-generic/cmpxchg.h>
#endif
#if defined( CONFIG_M68328 ) || defined( CONFIG_M68EZ328 ) || \
defined (CONFIG_M68360) || defined( CONFIG_M68VZ328 )
......
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