From: Kyle McMartin <kyle@minerva.i.cabal.ca>
Date: Sat, 31 May 2008 16:15:42 +0000 (-0400)
Subject: parisc: fix miscompilation of ip_fast_csum with gcc >= 4.3
X-Git-Tag: firefly_0821_release~19939^2~1
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e374d17cd74ec5967f81e2b0c67ec3219a2bbbcc;p=firefly-linux-kernel-4.4.55.git

parisc: fix miscompilation of ip_fast_csum with gcc >= 4.3

ip_fast_csum needs an asm "memory" clobber, otherwise the aggressive
optimizations in gcc-4.3 cause it to be miscompiled.

Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
---

diff --git a/include/asm-parisc/checksum.h b/include/asm-parisc/checksum.h
index cc3ec1bd8919..e9639ccc3fce 100644
--- a/include/asm-parisc/checksum.h
+++ b/include/asm-parisc/checksum.h
@@ -65,7 +65,7 @@ static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 "2:\n"
 	: "=r" (sum), "=r" (iph), "=r" (ihl)
 	: "1" (iph), "2" (ihl)
-	: "r19", "r20", "r21" );
+	: "r19", "r20", "r21", "memory");
 
 	return (__force __sum16)sum;
 }