linux-kernel - Re: mtd: kernel BUG at arch/x86/mm/pat.c:279!

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Date:	Sun, 09 Sep 2012 20:04:32 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mtd@...ts.infradead.org, linux-mm <linux-mm@...ck.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: mtd: kernel BUG at arch/x86/mm/pat.c:279!

On Sun, 2012-09-09 at 09:56 -0700, H. Peter Anvin wrote:
> 
> > So it should either be start=0xfffffffffffff000 end=0xffffffffffffffff
> > or it should be start=0xfffffffffffff000 len=0x1000.
> 
> I would strongly object to the former; that kind of inclusive ranges 
> breed a whole class of bugs by themselves.

Another alternative that avoids overflow issues is to use a PFN rather
than a byte address.

-- 
dwmw2

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