diff options
| author | Mathieu Desnoyers <compudj@krystal.dyndns.org> | 2007-05-08 09:34:38 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 20:15:20 +0200 |
| commit | 2856f5e31c1413bf6e4f1371e07e17078a5fee5e (patch) | |
| tree | 587dfe584f0913813d0cf2414a9378618143db15 /include/asm-i386/atomic.h | |
| parent | atomic.h: add atomic64 cmpxchg, xchg and add_unless to x86_64 (diff) | |
| download | linux-2856f5e31c1413bf6e4f1371e07e17078a5fee5e.tar.xz linux-2856f5e31c1413bf6e4f1371e07e17078a5fee5e.zip | |
atomic.h: atomic_add_unless as inline. Remove system.h atomic.h circular dependency
atomic_add_unless as inline. Remove system.h atomic.h circular dependency.
I agree (with Andi Kleen) this typeof is not needed and more error
prone. All the original atomic.h code that uses cmpxchg (which includes
the atomic_add_unless) uses defines instead of inline functions,
probably to circumvent a circular dependency between system.h and
atomic.h on powerpc (which my patch addresses). Therefore, it makes
sense to use inline functions that will provide type checking.
atomic_add_unless as inline. Remove system.h atomic.h circular dependency.
Digging into the FRV architecture shows me that it is also affected by
such a circular dependency. Here is the diff applying this against the
rest of my atomic.h patches.
It applies over the atomic.h standardization patches.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-i386/atomic.h')
| -rw-r--r-- | include/asm-i386/atomic.h | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/include/asm-i386/atomic.h b/include/asm-i386/atomic.h index 08935113206a..ff90c6e3fcb4 100644 --- a/include/asm-i386/atomic.h +++ b/include/asm-i386/atomic.h @@ -219,20 +219,21 @@ static __inline__ int atomic_sub_return(int i, atomic_t *v) * Atomically adds @a to @v, so long as @v was not already @u. * Returns non-zero if @v was not @u, and zero otherwise. */ -#define atomic_add_unless(v, a, u) \ -({ \ - __typeof__((v)->counter) c, old; \ - c = atomic_read(v); \ - for (;;) { \ - if (unlikely(c == (u))) \ - break; \ - old = atomic_cmpxchg((v), c, c + (a)); \ - if (likely(old == c)) \ - break; \ - c = old; \ - } \ - c != (u); \ -}) +static __inline__ int atomic_add_unless(atomic_t *v, int a, int u) +{ + int c, old; + c = atomic_read(v); + for (;;) { + if (unlikely(c == (u))) + break; + old = atomic_cmpxchg((v), c, c + (a)); + if (likely(old == c)) + break; + c = old; + } + return c != (u); +} + #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) #define atomic_inc_return(v) (atomic_add_return(1,v)) |