linux-kernel - Re: [v2,2/2] powerpc32: add support for csum

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Message-ID: <20150325013023.GA7588@home.buserror.net>
Date:	Tue, 24 Mar 2015 20:30:23 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	LEROY Christophe <christophe.leroy@....fr>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [v2,2/2] powerpc32: add support for csum_add()

On Tue, Feb 03, 2015 at 12:39:27PM +0100, LEROY Christophe wrote:
> The C version of csum_add() as defined in include/net/checksum.h gives the
> following assembly:
>        0:       7c 04 1a 14     add     r0,r4,r3
>        4:       7c 64 00 10     subfc   r3,r4,r0
>        8:       7c 63 19 10     subfe   r3,r3,r3
>        c:       7c 63 00 50     subf    r3,r3,r0
> 
> include/net/checksum.h also offers the possibility to define an arch specific
> function.
> This patch provides a ppc32 specific csum_add() inline function.

What makes it 32-bit specific?

-Scott
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