linux-kernel - Re: [PATCH 1/3] pinctrl: ADI PIN control driver for the GPIO controller on bf54x and bf60x.

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Message-ID: <CACRpkdbfCZWqowT3i9+5kx=1BBYS5qEROpAzutHbDmQ-kQqc1g@mail.gmail.com>
Date:	Wed, 7 Aug 2013 20:56:49 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Sonic Zhang <sonic.adi@...il.com>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Steven Miao <realmz6@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	adi-buildroot-devel@...ts.sourceforge.net,
	Sonic Zhang <sonic.zhang@...log.com>
Subject: Re: [PATCH 1/3] pinctrl: ADI PIN control driver for the GPIO
 controller on bf54x and bf60x.

On Thu, Aug 1, 2013 at 9:31 AM, Sonic Zhang <sonic.adi@...il.com> wrote:
> On Tue, Jul 30, 2013 at 12:47 AM, Linus Walleij
> <linus.walleij@...aro.org> wrote:
>> On Fri, Jul 26, 2013 at 6:57 AM, Sonic Zhang <sonic.adi@...il.com> wrote:
>>
>>> Could you please comment on this patch set? It is based on your former comments.
>>
>> I'll get to it. I'm pretty choked right now and actually trying to have
>> some vacation at the same time.
>>
>> In the meantime, after glancing over and noting prolific use of the
>> unlikely() macro, please read the following articles:
>> http://lwn.net/Articles/70473/
>> http://lwn.net/Articles/420019/
>>
>
> These articles say the directives should be rarely used. Do you
> suggest to remove them from the patch?

I think so? Or can you make a case for them being in
a critical path, like have you run a profiler (such as perf)
on the code and come to the conclusion that it's really
needed for performance? In that case, spell it out in the
patch description.

Yours,
Linus Walleij
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