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authorBob Breuer <breuerr@mc.net>2007-02-01 20:24:35 -0800
committerDavid S. Miller <davem@davemloft.net>2007-02-01 20:24:35 -0800
commit51bcf092917bfaa88d762879d0bbfe7619e8c16c (patch)
tree637ebcb8992b5358d142b8400fce25f5f82f0bcc
parente34efe3b100d0fbdf053128956c3dd0bc68754d6 (diff)
downloadlinux-sh-51bcf092917bfaa88d762879d0bbfe7619e8c16c.tar.gz
[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>
-rw-r--r--include/asm-sparc/checksum.h2
1 files changed, 1 insertions, 1 deletions
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;
}