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Make atomic_cmpset_32 correctly return 0 on failure.

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Benno Rice 2002-02-24 23:31:49 +00:00
parent 0077e8223b
commit dfc02c301d
1 changed files with 3 additions and 0 deletions
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3
sys/powerpc/include/atomic.h
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@ -345,7 +345,10 @@ atomic_cmpset_32(volatile u_int32_t* p, u_int32_t cmpval, u_int32_t newval)
"bne- 1b\n\t" /* spin if failed */
"eieio\n" /* memory barrier */
"sync\n"
"b 3f\n\t" /* we've succeeded */
"2:\t\n"
"xor %0,%0,%0\t\n" /* failure, so return 0 */
"3:\t\n"
: "=&r" (ret)
: "r" (cmpval), "r" (newval), "r" (p)
: "memory");