linux-kernel - Re: [PATCH] x86 MCE: shut up lockdep warning

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Message-ID: <20090508064517.GX23223@one.firstfloor.org>
Date:	Fri, 8 May 2009 08:45:17 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86 MCE: shut up lockdep warning

On Fri, May 08, 2009 at 11:47:09AM +0800, Shaohua Li wrote:
> lockdep report below warning when I try to offline one cpu:
> [  110.835487] =================================
> [  110.835616] [ INFO: inconsistent lock state ]
> [  110.835688] 2.6.30-rc4-00336-g8c9ed89 #52
> [  110.835757] ---------------------------------
> [  110.835828] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
> [  110.835908] swapper/0 [HC1[1]:SC0[0]:HE0:SE1] takes:
> [  110.835982]  (cmci_discover_lock){?.+...}, at: [<ffffffff80236dc0>] cmci_clear+0x30/0x9b
> 
> smp_call_function_single() will disable interrupt. moving mce reenable/disable
> to workqueue, so no irq is disabled.

Looks good. Thanks.

Acked-by: Andi Kleen <ak@...ux.intel.com>
> 
> Signed-off-by: Shaohua Li<shaohua.li@...el.com>

-Andi
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