linux-kernel - Re: [RFC] [PATCH] x86: Use ELF section to list CPU vendor specific code (Linux Tiny)

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Message-ID: <20080225092933.6a8dbc36@crazy>
Date:	Mon, 25 Feb 2008 09:29:33 +0100
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Matt Mackall <mpm@...enic.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Linux-tiny@...enic.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	michael@...e-electrons.com
Subject: Re: [RFC] [PATCH] x86: Use ELF section to list CPU vendor specific
 code (Linux Tiny)

Le Sat, 23 Feb 2008 10:43:37 +0800,
Matt Mackall <mpm@...enic.com> a écrit :

> This is not quite what Peter and I were thinking of, I think. It's not
> at all generic. How about a section that simply contains a set of
> function pointers, a macro to add things to that section, and a
> function that calls all the pointers in that section. Eg:
> 
> CALLBACK_SECTION(init_cpu_amd, "cpuvendor.init");
> invoke_callback_section("cpuvendor.init");
> 
> ..which would give us a generic facility we could use in various
> places.

I see. Probably doable. How would it work in the LD script file ? Your
mechanism allows to specify any section name, but AFAIK, the sections
must be explicitly listed in the kernel LD script in order to be
included in the final kernel image. Am I missing something ?

Sincerly,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Free Embedded Linux Training Materials
on http://free-electrons.com/training
(More than 1500 pages!)

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