Re: [PATCH] x86: Construct 32 bit boot time page tables in nativeformat.

[Pavel Machek]

Hi!

> > > >>I just looked at the ACPI suspend code, and it looks 
> > > >>like it hacks its own identity map at runtime.  Pavel, 
> > > >>am I reading that code right?
> > > >
> > > >Yes, I think so, I believe we do it on both 32 and 64 
> > > >bit now.
> > > >
> > > 
> > > So the background to this... we need an identity map to 
> > > trampoline at early boot, obviously, but we'd like it to 
> > > not stick around more than necessary.  We have 
> > > zap_low_mappings() now but it's not really sufficient.
> > > 
> > > Secondary SMP processors need these mappings during 
> > > trampolining -- presumably including CPU hotplug -- and 
> > > I'm suspecting it might simply make sense to use a 
> > > separate set of page tables (with both the identity and 
> > > the kernel map) for trampolining and just keep them 
> > > around.  That way they would be usable for ACPI as well.
> > 
> > That would enable some cleanups, yes.
> 
> Speaking of cleanups, the following one is applicable IMO.

ACK... and BTW ack for that deferred device removal series.

							Pavel
-- 
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