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

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Date:	Wed, 4 May 2011 12:25:33 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.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


* Ingo Molnar <mingo@...e.hu> wrote:

> * Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> > But I rather suspect, that CONFIG_SLUB=y is the thing we need to look at. The 
> > lockless fastpath cmpxchg comes to my mind.
> 
> Hm, and CONFIG_X86_ELAN, as Linus noted, has an impact on the cmpxchg 
> implementation.

Walter, could you please test the patch below on a failing kernel?

Note, the patch is actually incorrect for a real Elan box, but should work on 
Walter's box - and should avoid the cmpxchg8b_emul implementation on that box.

Thanks,

	Ingo

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 6a7cfdf..0783906 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -402,7 +402,7 @@ config X86_TSC
 
 config X86_CMPXCHG64
 	def_bool y
-	depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
+	depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM || X86_ELAN
 
 # this should be set for all -march=.. options where the compiler
 # generates cmov.
--
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