linux-kernel - Re: 2.6.39.1 immediately reboots/resets on EFI system

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Message-ID: <20110610175429.GA28500@srcf.ucam.org>
Date:	Fri, 10 Jun 2011 18:54:30 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Maarten Lankhorst <m.b.lankhorst@...il.com>
Cc:	Yinghai Lu <yinghai@...nel.org>, Jim Bos <jim876@...all.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: 2.6.39.1 immediately reboots/resets on EFI system

On Fri, Jun 10, 2011 at 07:51:46PM +0200, Maarten Lankhorst wrote:
> Well,
> 
> Op 10-06-11 18:47, Matthew Garrett schreef:
> > So this is obviously even more of a hack, but before you check whether 
> > the memblock has already been reserved could you __check_region it as 
> > well? That ought to avoid us touching the kernel. I've got a patch for 
> > grub that'll avoid the situation where we load the kernel on top of an 
> > existing resource and I'll port that to grub2, but that's still going to 
> > be awkward for existing bootloaders.
> >
> Erm, __check_region calls __requestion_region which does a kzalloc,
> if I call __check_region it doesn't boot, probably because of that.

Oh, bother.

> Do you want me to manually run through iomem_resource? Is it even available up at that point?

Should be - we've already called insert_resource to set up the kernel at 
this point.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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