From: Segher Boessenkool <segher@kernel.crashing.org>
To: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Scott Wood <oss@buserror.net>,
antoine.blangy@c-s.fr, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] powerpc/32: fix csum_partial_copy_generic()
Date: Mon, 1 Aug 2016 08:15:06 -0500 [thread overview]
Message-ID: <20160801131505.GA1742@gate.crashing.org> (raw)
In-Reply-To: <20160801125605.410371A23A2@localhost.localdomain>
On Mon, Aug 01, 2016 at 02:56:05PM +0200, Christophe Leroy wrote:
> --- a/arch/powerpc/lib/checksum_32.S
> +++ b/arch/powerpc/lib/checksum_32.S
> @@ -127,7 +127,8 @@ _GLOBAL(csum_partial_copy_generic)
> stw r7,12(r1)
> stw r8,8(r1)
>
> - andi. r0,r4,1 /* is destination address even ? */
> + rlwinm r0,r4,3,0x8 /* is destination address even ? */
> + rlwnm r6,r6,r0,0,31 /* swap bytes for odd destination */
> cmplwi cr7,r0,0
> addic r12,r6,0
> addi r6,r4,-4
That does not "swap bytes"; it shifts the word up by 8 bits, instead.
That may or may not do what is intended.
Segher
next prev parent reply other threads:[~2016-08-01 13:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-01 12:56 [PATCH] powerpc/32: fix csum_partial_copy_generic() Christophe Leroy
2016-08-01 13:15 ` Segher Boessenkool [this message]
2016-08-01 13:45 ` Christophe Leroy
2016-08-01 14:31 ` Segher Boessenkool
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