linux-kernel - RE: [RFC][PATCH] ia64: fix csum_ipv6

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Date:	Tue, 1 Sep 2009 16:20:34 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Yu, Fenghua" <fenghua.yu@...el.com>, 'Jiri Bohac' <jbohac@...e.cz>
CC:	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'linux-ia64@...r.kernel.org'" <linux-ia64@...r.kernel.org>
Subject: RE: [RFC][PATCH] ia64: fix csum_ipv6_magic()

>--- a/arch/ia64/lib/ip_fast_csum.S
>+++ b/arch/ia64/lib/ip_fast_csum.S
>@@ -96,20 +96,22 @@ END(ip_fast_csum)
> GLOBAL_ENTRY(csum_ipv6_magic)
> 	ld4	r20=[in0],4
> 	ld4	r21=[in1],4
>-	dep	r15=in3,in2,32,16
>+	zxt4	in3=in3

I think this zxt4 instruction have a typo.  You really want to zap the
high part on "in2" here (the "len") parameter.  "in3" contains the "proto"
argument, which is only 16-bits.  But any garbage in the high part on in3
will be dropped by the "dep" instruction later which only pulls out the low
16 bits from it.

So I think you meant to type:

	zxt4	in2=in2

Does this make sense?

-Tony
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