linux-kernel - Re: [PATCH 11/15] x86: move enabling of io_apic to prepare

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Message-ID: <Pine.LNX.4.55.0806092058550.26593@cliff.in.clinika.pl>
Date:	Mon, 9 Jun 2008 21:12:12 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Glauber Costa <gcosta@...hat.com>
cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	tglx@...utronix.de, mingo@...e.hu, hugh@...itas.com
Subject: Re: [PATCH 11/15] x86: move enabling of io_apic to prepare_cpus

On Mon, 9 Jun 2008, Glauber Costa wrote:

> This one does enable_IO_APIC in the init_uniprocessor too, and should 
> account for the !smp case.

 Hmm, it looks a little bit better, but why do you want to call
enable_IO_APIC() separately in the first place?  There is a comment
stating: "Enable IO APIC before setting up error vector," but why is it
needed on 64-bit systems?  Especially as the very same system may run a
32-bit kernel and then it suddenly would not have to do this anymore?  
Strange...

 Also since you are cleaning up this code -- why don't you actually take
the opportunity and get rid of the horrible #ifdefs interspersed
throughout?

  Maciej
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