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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>
This commit is contained in:
Chris Zankel 2009-04-16 00:28:09 -07:00
parent 35e71f9068
commit 7dbe5c5424
1 changed files with 4 additions and 2 deletions
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6
arch/xtensa/include/asm/checksum.h
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@ -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);
}