linux-kernel - Re: [PATCH] sched: add statics, don't return void expressions

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Date:	Fri, 25 Apr 2008 14:42:12 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	Harvey Harrison <harvey.harrison@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: add statics, don't return void expressions

On Fri, 2008-04-25 at 14:32 +0200, Jan Engelhardt wrote:
> On Friday 2008-04-25 14:17, Peter Zijlstra wrote:
> >On Thu, 2008-04-24 at 18:17 -0700, Harvey Harrison wrote:
> >> Noticed by sparse:
> >> kernel/sched.c:760:20: warning: symbol 'sched_feat_names' was not declared. Should it be static?
> >> kernel/sched.c:767:5: warning: symbol 'sched_feat_open' was not declared. Should it be static?
> >> kernel/sched_fair.c:845:3: warning: returning void-valued expression
> >> kernel/sched.c:4386:3: warning: returning void-valued expression
> >
> >I'm still of two minds about that latter warning, I think:
> >
> >void foo(void);
> >
> >void bar(void)
> >{
> >	return foo();
> >}
> >
> >isn't wrong, as the return types match.
> 
> But you could save a keyword and use
> 
> void bar(void)
> {
> 	foo();
> }

Sure, but this was just to show the idiom at hand; an actual use case
would be something like this:

void bar(void)
{
	if (cond)
		return foo();

	/* do stuff ourselves */
}

Leaving out the return here does have side-effects.

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