linux-kernel - Re: [PATCH] x86 (Linux Tiny): configure out support for some processors

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Message-ID: <47B0EE46.6050208@zytor.com>
Date:	Mon, 11 Feb 2008 16:54:30 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matt Mackall <mpm@...enic.com>
CC:	Michael Opdenacker <michael-lists@...e-electrons.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Linux-tiny@...enic.com
Subject: Re: [PATCH] x86 (Linux Tiny): configure out support for	some	processors

Matt Mackall wrote:
> On Mon, 2008-02-11 at 15:01 -0800, H. Peter Anvin wrote:
>> Matt Mackall wrote:
>>> Best would be to have no ifdefs and do it all with linker magic, of
>>> course. But that's trickier.
>>>
>> I concur with this, definitely.
> 
> Ok, so let's come up with a plan. We can:
> 
> a) use weak symbols, ala cond_syscall
> b) use a special section
> c) use early_init code (is it early enough?)
> c) have some sort of registration list
> 
> Having a generic cond_call of some sort might be nice for this sort of
> thing.
> 

c) is out, because this has to be executed after the early generic code 
and before the late generic code.

b) would be my first choice, and yes, it would be a good thing to have a 
generalized mechanism for this.  For the registrant, it's pretty easy: 
just add a macro that adds a pointer to a named section.  We then need a 
way to get the base address and length of each such section in order to 
be able to execute each function in sequence.

	-hpa

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