linux-kernel - Re: Suspicious compilation warning

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Message-ID: <n2ycecb6d8f1005060624y8ada0c03yc4fab915b3d13a0a@mail.gmail.com>
Date:	Thu, 6 May 2010 10:24:23 -0300
From:	Marcelo Jimenez <mroberto@...i.cetuc.puc-rio.br>
To:	Kyungmin Park <kmpark@...radead.org>
Cc:	Sergei Shtylyov <sshtylyov@...sta.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Suspicious compilation warning

Hi Kyungmin,

On Wed, May 5, 2010 at 22:24, Kyungmin Park <kmpark@...radead.org> wrote:
>
> Hi,
>
> It tested with my board and working.
> Just curious. If NR_SECTION_ROOTS is zero and uninitialized then
> what's problem? Since we boot and working without patch.

The original compiler error message was:

mm/sparse.c: In function '__section_nr':
mm/sparse.c:135: warning: 'root' is used uninitialized in this function

Leaving a variable to be used uninitialized is the issue here.

> Thank you,
> Kyungmin Park

Regards,
Marcelo.
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