linux-kernel - Re: [PATCH] kernel/sysctl_binary.c: improve the usage of return value 'result'

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Date:	Tue, 06 Aug 2013 15:11:29 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Chen Gang <gang.chen@...anux.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, xi.wang@...il.com,
	nicolas.dichtel@...nd.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel/sysctl_binary.c: improve the usage of return
 value 'result'

On Tue, 2013-08-06 at 14:43 -0700, Andrew Morton wrote:
> On Tue, 06 Aug 2013 15:29:42 +0800 Chen Gang <gang.chen@...anux.com> wrote:
> 
> > Improve the usage of return value 'result', so not only can make code
> > clearer to readers, but also can improve the performance.
> 
> It used to be pervasive kernel style do to
> 
> 	ret = -ENOMEM;
> 	foo = alloc(...);
> 	if (!foo)
> 		goto out;
> 
> whereas nowadays people usually do the more straightforward
> 
> 	foo = alloc(...);
> 	if (!foo) {
> 		ret = -ENOMEM;
> 		goto out;
> 	}
> 
> The thinking was that the old style generated better code, but for the
> life of me I can't remember why :(

https://lkml.org/lkml/2008/12/16/383


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