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Don't initialise ret in atomic_cmpset_32.

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Add more synchronisation.
This commit is contained in:
Benno Rice 2001-06-26 13:54:17 +00:00
parent 353b398056
commit 7a0e745f1a
1 changed files with 1 additions and 2 deletions
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3
sys/powerpc/include/atomic.h
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@ -336,8 +336,6 @@ atomic_cmpset_32(volatile u_int32_t* p, u_int32_t cmpval, u_int32_t newval)
{
u_int32_t ret;
ret = 0;
__asm __volatile (
"1:\tlwarx %0, 0, %3\n\t" /* load old value */
"cmplw 0, %1, %0\n\t" /* compare */
@ -346,6 +344,7 @@ atomic_cmpset_32(volatile u_int32_t* p, u_int32_t cmpval, u_int32_t newval)
"stwcx. %0, 0, %3\n\t" /* attempt to store */
"bne- 1b\n\t" /* spin if failed */
"eieio\n" /* memory barrier */
"sync\n"
"2:\t\n"
: "=&r" (ret)
: "r" (cmpval), "r" (newval), "r" (p)