linux-kernel - Re: kfifo must_check warning (+ patch)

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Date:	Wed, 20 Oct 2010 11:56:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Stefani Seibold <stefani@...bold.net>
Subject: Re: kfifo must_check warning (+ patch)

On Wed, 20 Oct 2010 19:37:02 +0100
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > Some versions of gcc mysteriously report:
> > drivers/char/n_gsm.c:1580: warning: ignoring return value of '__kfifo_must_check_helper', declared with attribute warn_unused_result
> > 
> > This warning can be eliminated by using a local variable for the
> > returned result value, as suggested by Andrew Morton.
> 
> But that just hides the bug in the helper surely - the helper has type
> errors so needs fixing - not this. If you apply this then the underlying
> bug is just going to get forgotten
> 

It won't get forgotten.

I agree that the warning is probably an artifact of the signedness
thing.  So for 2.6.36, disabling __kfifo_must_check_helper() will
suffice.  I'm sure that Stefani will fix up __kfifo_must_check_helper()
for real for 2.6.37, then we can see if the warning reoccurs.
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