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fix missing barrier instructions in powerpc atomic asm

This commit is contained in:
Rich Felker 2014-07-19 15:57:48 -04:00
parent bcad484394
commit 1456b7ae6b
1 changed files with 4 additions and 1 deletions
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5
arch/powerpc/atomic.h
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@ -25,11 +25,14 @@ static inline int a_ctz_64(uint64_t x)
static inline int a_cas(volatile int *p, int t, int s)
{
__asm__("1: lwarx %0, 0, %4\n"
__asm__("\n"
" sync\n"
"1: lwarx %0, 0, %4\n"
" cmpw %0, %2\n"
" bne 1f\n"
" stwcx. %3, 0, %4\n"
" bne- 1b\n"
" isync\n"
"1: \n"
: "=&r"(t), "+m"(*p) : "r"(t), "r"(s), "r"(p) : "cc", "memory" );
return t;