linux-kernel - Re: [PATCH] unhide CONFIG_DEBUG_SECTION

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Message-ID: <20080214211117.GH21894@uranus.ravnborg.org>
Date:	Thu, 14 Feb 2008 22:11:17 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Erez Zadok <ezk@...sunysb.edu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] unhide CONFIG_DEBUG_SECTION_MISMATCH

On Thu, Feb 14, 2008 at 04:05:14PM -0500, Erez Zadok wrote:
> In message <20080214210003.GF21894@...nus.ravnborg.org>, Sam Ravnborg writes:
> > On Thu, Feb 14, 2008 at 03:54:04PM -0500, Erez Zadok wrote:
> > > Using: v2.6.25-rc1-120-ge760e71
> > > 
> > > In a normal compilation, I might this message:
> > > 
> > > ...
> > >   MODPOST vmlinux.o
> > > WARNING: modpost: Found 4 section mismatch(es).
> > > To see full details build your kernel with:
> > > 'make CONFIG_DEBUG_SECTION_MISMATCH=y'
> > > ...
> > > 
> > > I can indeed try to re-make, passing CONFIG_DEBUG_SECTION_MISMATCH=y on the
> > > command line, but I can't turn on the option in my .config.  That's because
> > > the option depends on "UNDEFINED".  (Was that an attempt to "hide" the
> > > option?  Why?)  The following small patch allows me to set the option in my
> > > .config.
> > 
> > It was done so on purpose.
> > The rationale here is that we yet have too many section mismatch for
> > a typical build to pass my "good stomach" test.
> > So until we get down on an acceptable level we should not be
> > too noisy.
> > And I wanted it to be turned off also for allyesconfig builds.
> > 
> > I hope to spend time on the reaming warnings soon but the
> > option will not be enabled until latest next mergewindow.
> > 
> > You could argue that I could have doen this in better ways
> > The present version was just simple.
> > 
> > 	Sam
> 
> Thanks, Sam.  That explains it.  Perhaps a small comment next to the Kconfig
> entry might help explain why the option is "hidden" for now, so others won't
> bother unhiding it again.

Something like this?
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index a370fe8..8a6b514 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -81,6 +81,8 @@ config HEADERS_CHECK

 config DEBUG_SECTION_MISMATCH
        bool "Enable full Section mismatch analysis"
+# Hide this option until we are down to a reasonable amount of warnings
+# for a typical kernel configuration
        depends on UNDEFINED
        help


	Sam
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