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

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Message-ID: <20120529183952.GA31237@phenom.dumpdata.com>
Date:	Tue, 29 May 2012 14:39:52 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	"Liu, Jinsong" <jinsong.liu@...el.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)

> 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?

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