From 7fdae458bd421046a300a69dcb32953ac9450136 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 19 Jul 2014 12:19:20 -0400 Subject: fix broken constraints for powerpc atomic cas asm the register constraint for the address to be accessed did not convey that the asm can access the pointed-to object. as far as the compiler could tell, the result of the asm was just a pure function of the address and the values passed in, and thus the asm could be hoisted out of loops or omitted entirely if the result was not used. --- arch/powerpc/atomic.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/atomic.h b/arch/powerpc/atomic.h index d52ee0c6..05951a2d 100644 --- a/arch/powerpc/atomic.h +++ b/arch/powerpc/atomic.h @@ -31,7 +31,7 @@ static inline int a_cas(volatile int *p, int t, int s) " stwcx. %3, 0, %1\n" " bne- 1b\n" "1: \n" - : "=&r"(t) : "r"(p), "r"(t), "r"(s) : "cc", "memory" ); + : "=&r"(t), "+m"(*p) : "r"(t), "r"(s) : "cc", "memory" ); return t; } -- cgit v1.2.1