linux-kernel - Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs

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Message-ID: <20110504165021.GA1404@elte.hu>
Date:	Wed, 4 May 2011 18:50:21 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Christoph Lameter <cl@...ux.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tejun Heo <tj@...nel.org>, Pekka Enberg <penberg@...nel.org>,
	Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	werner <w.landgraf@...ru>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> My gut reaction would be: let's do the minimal patch that just fixes things 
> to do irqsafe_cpu_cmpxchg_double() for 2.6.39, and then let's remove the 
> #ifdef'fery in -rc1. [...]

Looks like the sanest option IMHO, -rc7 is pretty late for anything than a 
few-liner patch.

> [...] Or make _really_ sure that things are ok for platforms that never even 
> triggered the CMPXCHG_LOCAL case before.

Considering that the status quo was !CMPXCHG_LOCAL in v2.6.38 and that lockless 
SLUB is an x86-only affair right now:

 $ git grep CMPXCHG_LOCAL arch/
 arch/um/Kconfig.x86:config CMPXCHG_LOCAL
 arch/x86/Kconfig.cpu:config CMPXCHG_LOCAL

There should be no problem with other architectures, right?

Thanks,

	Ingo
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