linux-kernel - Re: [PATCH 3/6] x86,64: Simplify save

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Message-ID: <20110706204201.GA19985@somewhere>
Date:	Wed, 6 Jul 2011 22:42:06 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Jan Beulich <JBeulich@...ell.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] x86,64: Simplify save_regs()

On Wed, Jul 06, 2011 at 11:20:49AM -0700, H. Peter Anvin wrote:
> On 07/06/2011 10:34 AM, Andi Kleen wrote:
> > Frederic Weisbecker <fweisbec@...il.com> writes:
> >>
> >> I really did not think about code duplication, considering
> >> it's better to optimize the irq entry path.
> >>
> >> What do you guys think? We can still revert the whole patchset.
> > 
> > FWIW I think it should be a macro, like it was in the original code.
> > 
> > Optimizing entry*.S for code size doesn't make a lot of sense.
> > 
> 
> Code size, no.
> 
> *Path* size and cache/prefetch friendliness is another matter.
> The subroutine is bad on that account, too, so yes, this really seems
> like a losing proposition.
> 
> I'm not too fond of the gajillion obtuse macros we have, but subroutines
> doesn't make it really any better.

Fine, so I guess we can keep that macro conversion.
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