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 <[EMAIL PROTECTED]>
---
diff --git a/include/asm-sparc/checksum.h b/include/asm-sparc/checksum.h
index 267e631..34518ea 100644
--- a/include/asm-sparc/checksum.h
+++ b/include/asm-sparc/checksum.h
@@ -151,7 +151,7 @@ static inline __sum16 ip_fast_csum(const
"xnor\t%%g0, %0, %0"
: "=r" (sum), "=&r" (iph)
: "r" (ihl), "1" (iph)
- : "g2", "g3", "g4", "cc");
+ : "g2", "g3", "g4", "cc", "memory");
return sum;
}
-
To unsubscribe from this list: send the line "unsubscribe sparclinux" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
