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Commit 7dbe5c54 authored by Chris Zankel's avatar Chris Zankel
Browse files

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: default avatarChris Zankel <chris@zankel.net>
parent 35e71f90

arch/xtensa/include/asm/checksum.h

+4 −2
Original line number Diff line number Diff line
@@ -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);

}