linux-kernel - Re: [RFC] move __devinit or __init printk constant format strings to __devinitconst or _

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Date:	Tue, 21 Jul 2009 20:28:05 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	Joe Perches <joe@...ches.com>, linux-embedded@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Tim Bird <tim.bird@...sony.com>
Subject: Re: [RFC] move __devinit or __init printk constant format strings
 to __devinitconst or __initdata?

On Tue, 2009-07-21 at 16:50 -0700, David Daney wrote:
> Joe Perches wrote:
> > On Tue, 2009-07-21 at 17:57 -0500, Matt Mackall wrote:
> >> On Tue, 2009-07-21 at 14:56 -0700, Joe Perches wrote:
> >>> On Tue, 2009-07-21 at 16:48 -0500, Matt Mackall wrote:
> >>>> On Tue, 2009-07-21 at 14:20 -0700, Joe Perches wrote:
> >>>>> Is moving constant string formats to __devinitconst or __initdata
> >>>>> useful for embedded environments?
> >>>> Interesting notion, but not worth the trouble in my mind. I think it's
> >>>> more worthwhile to look into automatic such stuff in the build somehow.
> >>> I think it's not possible today to get gcc to mark
> >>> the format strings without source modification.
> >> Yep, that's why I specifically said 'build'. It can probably be done in
> >> a post-processing step with some ELF wizardry. 
> > 
> > Know any elven wizards?
> > 
> 
> It would be tricky, the string data from the entire compilation unit is 
> intermingled.  You would have to separate out only those strings 
> referenced from __init sections into their own section and fix up all 
> symbols and relocations that were affected.

Exactly. Annoying but not impossible.

> Probably easier would be to use the plug-in feature that will be part of 
> GCC-4.5 (or will that be called GCC-5.0??), and create a special Linux 
> kernel GCC plug-in that just emits the __init literal strings to the 
> proper section to begin with.  This wouldn't be unprecedented, the 
> Mozilla people already use their own extensions to GCC, and will 
> probably migrate to GCC plug-ins.  We don't want the kernel to get left 
> behind in the GCC plug-in race.

There are no doubt a number of things we could be doing with such
extensions.

-- 
http://selenic.com : development and support for Mercurial and Linux


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