linux-kernel - Re: [PATCH] x86: APIC: Remove apic_write

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Message-ID: <20080719214329.GA836@elte.hu>
Date:	Sat, 19 Jul 2008 23:43:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Zachary Amsden <zach@...are.com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH] x86: APIC: Remove apic_write_around(); use alternatives


* Zachary Amsden <zach@...are.com> wrote:

> On Fri, 2008-07-18 at 15:49 -0700, Suresh Siddha wrote:
> 
> > > Thank you for cleaning this up Yinghai, but this really begs the
> > > question - is having write_atomic REALLY worthwhile?
> > 
> > And this thread is about,  Maciej's cleanup patch which removed
> > write_atomic completely :)
> > 
> > Thanks to Maciej who posted this fix. It was on my todo list for
> > sometime now!
> 
> Awesome!  I just felt the need to use 'flaming crap' in a sentence 
> today, and broken APICs seemed like an easy target.  Glad to know it's 
> gone.

it's gone, but without breaking or limiting old hardware: it's done by 
moving the code into a quirk. And that's the general direction which we 
want to take in such cases - move ugly non-standard stuff into 
low-maintenance-overhead quirks.

	Ingo
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