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Add cmpxchg_local to sparc64

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Use cmpxchg_u32 and cmpxchg_u64 for cmpxchg_local and cmpxchg64_local. For other
type sizes, use the new generic cmpxchg_local (disables interrupt).

Change:
Since the header depends on local_irqsave/local_irqrestore, it must be
included after their declaration.

Actually, being below the
#include <linux/irqflags.h> should be enough, and on sparc64 it is
included at the beginning of system.h.

So it makes sense to move it up for sparc64.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mathieu Desnoyers 2008-02-07 00:16:25 -08:00 committed by Linus Torvalds
parent 405321d3ab
commit 80af4eeb72
1 changed files with 29 additions and 0 deletions
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29
include/asm-sparc64/system.h
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@ -8,6 +8,7 @@
#ifndef __ASSEMBLY__
#include <linux/irqflags.h>
#include <asm-generic/cmpxchg-local.h>
/*
* Sparc (general) CPU types
@ -315,6 +316,34 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
(unsigned long)_n_, sizeof(*(ptr))); \
})
/*
* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
* them available.
*/
static inline unsigned long __cmpxchg_local(volatile void *ptr,
unsigned long old,
unsigned long new, int size)
{
switch (size) {
case 4:
case 8: return __cmpxchg(ptr, old, new, size);
default:
return __cmpxchg_local_generic(ptr, old, new, size);
}
return old;
}
#define cmpxchg_local(ptr, o, 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)); \
})
#endif /* !(__ASSEMBLY__) */
#define arch_align_stack(x) (x)