Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=51bcf092917bfaa88d762879d0bbfe7619e8c16c
Commit:     51bcf092917bfaa88d762879d0bbfe7619e8c16c
Parent:     e34efe3b100d0fbdf053128956c3dd0bc68754d6
Author:     Bob Breuer <[EMAIL PROTECTED]>
AuthorDate: Thu Feb 1 20:24:35 2007 -0800
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Thu Feb 1 20:24:35 2007 -0800

    [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 <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
 include/asm-sparc/checksum.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

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 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;
 }
 
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