diff options
| author |   Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | 2008-02-07 00:16:20 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-07 08:42:32 -0800 |
| commit | 027bcc27d3d1a218dbf4477964a18fed78983357 (patch) | |
| tree | a76ba273a2cdbd1866e79b3840c3293b13b50251 /include | |
| parent | Add cmpxchg_local to m86k (diff) | |
| download | linux-dev-027bcc27d3d1a218dbf4477964a18fed78983357.tar.xz linux-dev-027bcc27d3d1a218dbf4477964a18fed78983357.zip | |
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: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-m68knommu/system.h | 28 |
1 files changed, 11 insertions, 17 deletions
diff --git a/include/asm-m68knommu/system.h b/include/asm-m68knommu/system.h index ee2dc07bae0e..039ab3f81732 100644 --- a/include/asm-m68knommu/system.h +++ b/include/asm-m68knommu/system.h @@ -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 ) |