Messages in this thread Patch in this message | | | From | Mathieu Desnoyers <> | Subject | [PATCH 03/09] atomic.h : i386 type safety fix | Date | Thu, 11 Jan 2007 20:35:35 -0500 |
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atomic.h : i386 type safety fix
This patch removes an explicit cast to an integer type for the result returned by cmpxchg. It is not per se a problem on the i386 architecture, because sizeof(int) == sizeof(long), but whenever this code is cut'n'pasted to a different architecture (which happened at least for x86_64), it would simply accept passing an atomic64_t value as parameter to cmpxchg, xchg and add_unless, having 64 bits inputs casted to 32 bits.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
--- a/include/asm-i386/atomic.h +++ b/include/asm-i386/atomic.h @@ -207,8 +207,9 @@ static __inline__ int atomic_sub_return(int i, atomic_t *v) return atomic_add_return(-i,v); } -#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new)) -#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) +#define atomic_cmpxchg(v, old, new) \ + ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (old), (new))) +#define atomic_xchg(v, new) (xchg(&((v)->counter), (new))) /** * atomic_add_unless - add unless the number is a given value @@ -221,7 +222,7 @@ static __inline__ int atomic_sub_return(int i, atomic_t *v) */ #define atomic_add_unless(v, a, u) \ ({ \ - int c, old; \ + __typeof__((v)->counter) c, old; \ c = atomic_read(v); \ for (;;) { \ if (unlikely(c == (u))) \ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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