linux-kernel - RE: [Xen-devel] [PATCH 1/3] xen/mce: Add mcelog support for Xen platform (v2)

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Date:	Wed, 30 May 2012 15:14:57 +0000
From:	"Liu, Jinsong" <jinsong.liu@...el.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Borislav Petkov <bp@...64.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	"'xen-devel@...ts.xensource.com'" <xen-devel@...ts.xensource.com>
Subject: RE: [Xen-devel] [PATCH 1/3] xen/mce: Add mcelog support for Xen
 platform (v2)

Konrad Rzeszutek Wilk wrote:
>> An approach which basically same as you suggested but w/ slightly
>> update, is 1). at xen/mcelog.c, do
>> misc_register(&xen_mce_chrdev_device) at xen_late_init_mcelog,
>> define it as device_initcall(xen_late_init_mcelog) --> now linux dd
>> ready, so xen mcelog divice would register successfully;   
> 
> OK.
>> 2). at native mce.c, change 1 line from
>> device_initcall(mcheck_init_device) to
>> device_initcall_sync(mcheck_init_device) --> so
>> misc_register(&mce_chrdev_device) would be blocked by xen mcelog
>> device;    
> 
> You mean that the registration would be delayed to the next initcall
> level. 
> Ok, that sounds right.. but you also need to actually check the
> 'misc_register' return value and if it fails (which it would in this
> case) unroll all the registration 
> that the generic code I think?

Hmm, this patch blocked AMD mce logic, it's unacceptable.

Thanks,
Jinsong

> 
>> 
>> I have draft test it and works fine.
>> Thought?
>> 
>> Thanks,
>> Jinsong
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