linux-kernel - Re: [RFC V6 3/3] arm64:add bitrev.h file to support rbit instruction

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Message-ID: <20141103095051.GA23019@arm.com>
Date:	Mon, 3 Nov 2014 09:50:51 +0000
From:	Will Deacon <will.deacon@....com>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akinobu.mita@...il.com" <akinobu.mita@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Joe Perches <joe@...ches.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC V6 3/3] arm64:add bitrev.h file to support rbit instruction

On Mon, Nov 03, 2014 at 08:47:32AM +0000, Ard Biesheuvel wrote:
> On 3 November 2014 03:17, Wang, Yalin <Yalin.Wang@...ymobile.com> wrote:
> >> From: Will Deacon [mailto:will.deacon@....com]
> >> > +#ifndef __ASM_ARM64_BITREV_H
> >> > +#define __ASM_ARM64_BITREV_H
> >>
> >> Really minor nit, but we don't tend to include 'ARM64' in our header guards,
> >> so this should just be __ASM_BITREV_H.
> >>
> >> With that change,
> >>
> >>   Acked-by: Will Deacon <will.deacon@....com>
> >>
> > I have send the patch to the patch system:
> > http://www.arm.linux.org.uk/developer/patches/search.php?uid=4025
> >
> > 8187/1 8188/1 8189/1
> >
> > Just remind you that , should also cherry-pick Joe Perches's
> > 2 patches:
> > [PATCH] 6fire: Convert byte_rev_table uses to bitrev8
> > [PATCH] carl9170: Convert byte_rev_table uses to bitrev8
> >
> > To make sure there is no build error when build these 2 drivers.
> >
> 
> If this is the case, I suggest you update patch 8187/1 to retain the
> byte_rev_table symbol, even in the accelerated case, and remove it
> with a followup patch once Joe's patches have landed upstream. Also, a
> link to the patches would be nice, and perhaps a bit of explanation
> how/when they are expected to be merged.

Indeed, or instead put together a series with the appropriate acks so
somebody can merge it all in one go. Merging this on a piecemeal basis is
going to cause breakages (as you pointed out).

Will
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