From 51bcf092917bfaa88d762879d0bbfe7619e8c16c Mon Sep 17 00:00:00 2001 From: Bob Breuer <breuerr@mc.net> Date: Thu, 1 Feb 2007 20:24:35 -0800 Subject: [PATCH] [SPARC32]: Fix over-optimization by GCC near ip_fast_csum. In some cases such as: iph->check = 0; iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); GCC may optimize out the previous store. Observed as a failure of NFS over udp (bad checksums on ip fragments) when compiled with GCC 3.4.2. Signed-off-by: Bob Breuer <breuerr@mc.net> Signed-off-by: David S. Miller <davem@davemloft.net> --- include/asm-sparc/checksum.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/asm-sparc/checksum.h b/include/asm-sparc/checksum.h index 267e631e9bbc..34518ea7bf1b 100644 --- a/include/asm-sparc/checksum.h +++ b/include/asm-sparc/checksum.h @@ -151,7 +151,7 @@ static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) "xnor\t%%g0, %0, %0" : "=r" (sum), "=&r" (iph) : "r" (ihl), "1" (iph) - : "g2", "g3", "g4", "cc"); + : "g2", "g3", "g4", "cc", "memory"); return sum; } -- GitLab