linux-kernel - Re: [PATCH] misc/cs5535: Fix section mismatch derived from cs5535_mfgpt

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Message-ID: <20110103205019.GA10739@merkur.ravnborg.org>
Date:	Mon, 3 Jan 2011 21:50:19 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Andres Salomon <dilinger@...ued.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Sedat Dilek <sedat.dilek@...glemail.com>,
	sameo@...ux.intel.com, tj@...nel.org, joe@...ches.com,
	linux-kernel@...r.kernel.org, Sedat Dilek <sedat.dilek@...il.com>
Subject: Re: [PATCH] misc/cs5535: Fix section mismatch derived from
	cs5535_mfgpt_drv variable

On Mon, Jan 03, 2011 at 12:34:31PM -0800, Andres Salomon wrote:
> On Mon, 3 Jan 2011 20:51:31 +0100
> Sam Ravnborg <sam@...nborg.org> wrote:
> 
> > On Mon, Jan 03, 2011 at 11:43:10AM -0800, Andrew Morton wrote:
> > > On Mon,  3 Jan 2011 03:51:28 +0100
> > > Sedat Dilek <sedat.dilek@...glemail.com> wrote:
> > > 
> > > > >From my build.log:
> > > > 
> > > > WARNING: drivers/misc/cs5535-mfgpt.o(.data+0x0): Section mismatch
> > > > in reference from the variable cs5535_mfgpt_drv to the
> > > > function .devinit.text:cs5535_mfgpt_probe() The variable
> > > > cs5535_mfgpt_drv references the function __devinit
> > > > cs5535_mfgpt_probe() If the reference is valid then annotate the
> > > > variable with __init* or __refdata (see linux/init.h) or name the
> > > > variable: *driver, *_template, *_timer, *_sht, *_ops, *_probe,
> > > > *_probe_one, *_console,
> > > 
> > > Confused.  cs5535_mfgpt_probe() _does_ have a name of the form
> > > "*_probe", so why did it warn?
> > 
> > The varibale need to follow the naming scheme.
> > In this case the function was named *_probe - which has no
> > significance in the section mismatch checks.
> > 
> > > > variable with __init* or __refdata (see linux/init.h) or name the
> > > > variable:
> >     ^^^^^^^^
> > ^^^^^^^^^ 
> > 
> > 	Sam
> 
> I see.  So it should really be renamed cs5535_mfgpt_driver, or _drv
> added to the whitelist.  Or the whitelist dropped, and all drivers
> changed to explicitly mark the structs with __devinitdata.

It is preferred that the variables are annotated __refdata.
> 
> It's kind of bizarre that we have variable names signifying whether or
> not warnings get issued..

It really helped to remove a lot of nosie when we introduced this check.

	Sam
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