linux-kernel - Re: [PATCH] mark %esi as clobbered in E820 BIOS call

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Message-ID: <20090328112035.GA11146@elte.hu>
Date:	Sat, 28 Mar 2009 12:20:35 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Michael K. Johnson" <johnsonm@...th.com>
Cc:	jmforbes@...uxtx.org, hpa@...or.com, Jordan_Hargrave@...l.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mark %esi as clobbered in E820 BIOS call


* Michael K. Johnson <johnsonm@...th.com> wrote:

> Justin and Peter, please review this for stable .y trees.  Peter,
> please review this for trunk unless you decide to do a more 
> extensive workaround for BIOS register clobbering.
> 
> Thanks!
> 
> $ cat e820-esi-clobber-workaround.patch
> Jordan Hargrave diagnosed a BIOS clobbering %esi in the E820 call.
> That particular BIOS has been fixed, but there is a possibility that
> this is responsible for other occasional reports of early boot
> failure, and it does not hurt to add %esi to the clobbers.

nice fix! Would you mind to update the clobber list to include _all_ 
registers? I dont see why any of the other registers couldnt be 
clobbered by a BIOS, and this is boot-only code so micro-performance 
is not an issue.

	Ingo
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