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

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Message-ID: <20110613180006.GA24902@srcf.ucam.org>
Date:	Mon, 13 Jun 2011 19:00:06 +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 Mon, Jun 13, 2011 at 07:52:42PM +0200, Maarten Lankhorst wrote:
> > +		 */
> > +
> > +		if ((start <= virt_to_phys(_etext)-1 && end >= virt_to_phys(_text)) ||
> > +		    (start <= virt_to_phys(_edata)-1 && end >= virt_to_phys(_etext)) ||
> _etext -> _sdata perhaps?

_etext is used for the resource allocation earlier, which seems like 
it's probably the relevant thing to be copying.

> >  		memblock_x86_reserve_range(start, start + size, "EFI Boot");
> >  	}
> >  }
> Will test though. It might also be appropriate to put a WARN when that condition happens.

That'd end up triggering even in cases that are absolutely safe (ie, the 
firmware doesn't have this bug). The amount of suck here is incredible.

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