linux-kernel - Re: [PATCH 2/2] kernel/{exit.c, signal.c, power/process.c}: replace !likely(x) by likely(!x)

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Message-ID: <47B79D0D.2070808@keyaccess.nl>
Date:	Sun, 17 Feb 2008 03:33:49 +0100
From:	Rene Herman <rene.herman@...access.nl>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Roel Kluin <12o3l@...cali.nl>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] kernel/{exit.c, signal.c, power/process.c}: replace
 !likely(x) by likely(!x)

On 16-02-08 20:01, H. Peter Anvin wrote:
> Roel Kluin wrote:
>> Not entirely sure who to send this to
>> ---
>> Replace !likely(x) by likely(!x)
> 
> Whoa...
> 
> Are you sure this is correct?
> 
> !likely(x) is equivalent to unlikely(!x)

Not with respect to its value I believe? likely(x) == !!(x), and 
unlikely(!x) == !!(!x) = !x, so conditions work out differently?

> not the opposite, so this is a functional change...

Rene.
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