From 7dbe5c542464a511f0ea6a14e3ff08874d7e21d5 Mon Sep 17 00:00:00 2001 From: Chris Zankel Date: Thu, 16 Apr 2009 00:28:09 -0700 Subject: [PATCH] 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 --- arch/xtensa/include/asm/checksum.h | 6 ++++-- 1 file 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); } -- 2.39.2