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| author | Chris Zankel <chris@zankel.net> | 2009-04-16 09:28:09 +0200 |
|---|---|---|
| committer | Chris Zankel <chris@zankel.net> | 2009-05-12 06:48:23 +0200 |
| commit | 7dbe5c542464a511f0ea6a14e3ff08874d7e21d5 (patch) | |
| tree | bf0d993c1c14726f167da89769050723145909c4 /arch/xtensa/include/asm/checksum.h | |
| parent | xtensa: Fix architecture specific Kconfig (diff) | |
| download | linux-7dbe5c542464a511f0ea6a14e3ff08874d7e21d5.tar.xz linux-7dbe5c542464a511f0ea6a14e3ff08874d7e21d5.zip | |
xtensa: Fix checksum header file
We need to add a "memory" dependency (barrier) in assembly macros
that access (read or write) memory. Otherwise, the compiler might
ill-optimize the order of memory accesses.
Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch/xtensa/include/asm/checksum.h')
| -rw-r--r-- | arch/xtensa/include/asm/checksum.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/xtensa/include/asm/checksum.h b/arch/xtensa/include/asm/checksum.h index f84d3f00774a..e4d831a30772 100644 --- a/arch/xtensa/include/asm/checksum.h +++ b/arch/xtensa/include/asm/checksum.h @@ -113,7 +113,8 @@ static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl) are modified, we must also specify them as outputs, or gcc will assume they contain their original values. */ : "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmp), "=&r" (endaddr) - : "1" (iph), "2" (ihl)); + : "1" (iph), "2" (ihl) + : "memory"); return csum_fold(sum); } @@ -227,7 +228,8 @@ static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, "1:\t" : "=r" (sum), "=&r" (__dummy) : "r" (saddr), "r" (daddr), - "r" (htonl(len)), "r" (htonl(proto)), "0" (sum)); + "r" (htonl(len)), "r" (htonl(proto)), "0" (sum) + : "memory"); return csum_fold(sum); } |