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

[H. Peter Anvin]

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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