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Subject: Re: [RFC][PATCH] sparc64: remove __ARCH_WANT_UNLOCKED_CTXSW usage
From: Peter Zijlstra <peterz@infradead.org>
To: David Miller <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@elte.hu,
        Catalin Marinas <catalin.marinas@arm.com>
Date: Thu, 22 Dec 2011 20:16:39 +0100
In-Reply-To: <20111221.180549.2295489434558987482.davem@davemloft.net>
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On Wed, 2011-12-21 at 18:05 -0500, David Miller wrote:
> From: David Miller <davem@davemloft.net>
> Date: Wed, 21 Dec 2011 16:44:26 -0500 (EST)
> 
> > From: Peter Zijlstra <peterz@infradead.org>
> > Date: Mon, 12 Dec 2011 16:14:12 +0100
> > 
> >> The only thing resting me is asking you to simply test the below patch
> >> and report what happens. Hopefully things will simply work.. if not I've
> >> messed up and need to go look harder :/
> > 
> > I'll give it a spin, and get back to you, thanks!
> 
> Ok, so far so good, I stressed out my Niagara-T3 box for a while doing gcc
> bootstraps, running the testsuite, etc. and all seems well so far.
> 
> I'll keep beating on it and let you know if anything funny happens, but for
> now as far as I'm concerned:
> 
> Acked-by: David S. Miller <davem@davemloft.net>

Thanks David!! 

I'll probably post again (and propose merger) once Catalin's patches
that remove __ARCH_WANT_INTERRUPTS_ON_CTXSW from ARM have landed.

ARM being the last user of that feature, and with only SPARC64 and IA64
(needlessly) using __ARCH_WANT_UNLOCKED_CTXSW we could finally remove
some of that hairy code from the core scheduler.