linux-kernel - Re: [PATCH v6 2/2] x86 mce: use new printk recursion disabling interface

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Date:	Wed, 6 Jun 2012 17:22:38 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	ShuoX Liu <shuox.liu@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yanmin Zhang <yanmin_zhang@...ux.intel.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH v6 2/2] x86 mce: use new printk recursion disabling
 interface

On Wed, Jun 06, 2012 at 04:34:21PM +0800, ShuoX Liu wrote:
> From: ShuoX Liu <shuox.liu@...el.com>
> 
> On x86 machines, some times MCE happens just when kernel calls printk
> to output some log info to serial console, while usually MCE module in
> kernel is used to print out some hardware error information, such like
> bad cache or bad memory bank. That causes printk recursion and printk
> would omit MCE printk output.
> 
> We hit it when running MTBF testing on Android ATOM mobiles.
> 
> Here in mce_panic, we choose to disable printk recursion to make sure
> MCE logs printed out.

Just a minor nitpick: this should say "print_mce" or you can simply
remove the whole sentence - commit message is fine without it too.

Aside of that, those look ok to me.

Thanks.

-- 
Regards/Gruss,
Boris.
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