linux-kernel - Re: [PATCH v3.2] kbuild: implement several W= levels

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Date:	Thu, 28 Apr 2011 18:18:07 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v3.2] kbuild: implement several W= levels

On Wed, Apr 27, 2011 at 10:15:27PM +0200, Borislav Petkov wrote:
> From: Sam Ravnborg <sam@...nborg.org>
> 
> Building a kernel with "make W=1" produces far too much noise to be
> useful.
> 
> Divide the warning options in three groups:
> 
>     W=1 - warnings that may be relevant and does not occur too often
>     W=2 - warnings that occur quite often but may still be relevant
>     W=3 - the more obscure warnings, can most likely be ignored
> 
> When building the whole kernel, those levels produce:
> 
> W=1 - 4859 warnings
> W=2 - 1394 warnings
> W=3 - 86666 warnings
> 
> respectively. Warnings have been counted with Geert's script at
> 
> http://www.kernel.org/pub/linux/kernel/people/geert/linux-log/linux-log-summary.pl
> 
> Many warnings occur from .h files so fixing one file may have a nice
> effect on the total number of warnings.
> 
> With these changes I am actually tempted to try W=1 now and then.
> Previously there was just too much noise.
> 
> Borislav:
> 
> - make the W= levels exclusive
> - move very noisy and making little sense for the kernel warnings to W=3
> - drop -Woverlength-strings due to useless warning message
> - copy explanatory text for the different warning levels to 'make help'
> - recount warnings per level
> 
> Signed-off-by: Sam Ravnborg <sam@...nborg.org>
> Signed-off-by: Borislav Petkov <bp@...en8.de>
> Cc: Dave Jones <davej@...hat.com>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>

Applied to kbuild-2.6.git#kbuild, thanks!

Michal
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