linux-kernel - Re: [PATCH 05/15] drivers: input: Drop unlikely before IS_ERR(_OR

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Message-ID: <20150801112251.GK899@linux>
Date:	Sat, 1 Aug 2015 16:52:51 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	akpm@...ux-foundation.org, linaro-kernel@...ts.linaro.org,
	linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
	"open list:INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN)..." 
	<linux-input@...r.kernel.org>, Masaki Ota <masaki.ota@...alps.com>,
	Pali Rohár <pali.rohar@...il.com>
Subject: Re: [PATCH 05/15] drivers: input: Drop unlikely before
 IS_ERR(_OR_NULL)

On 31-07-15, 09:58, Dmitry Torokhov wrote:
> On Fri, Jul 31, 2015 at 02:08:25PM +0530, Viresh Kumar wrote:
> > IS_ERR(_OR_NULL) already contain an 'unlikely' compiler flag and there
> > is no need to do that again from its callers. Drop it.
> 
> I'd rather keep it as it documents the expected behavior and double
> unlikely should work just fine.

TBH, I don't really agree that it is there for documentation. The only purpose
of such compiler flags is to try make code more efficient.

Anyway, I got to this series as someone asked me to fix this for one of my
patches which used unlikely(IS_ERR_OR_NULL()). And so I thought about fixing all
sites that are doing double unlikely (that shouldn't hurt for sure).

I will leave it to you.

-- 
viresh
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