linux-kernel - Re: Linux 2.6.26-rc1 - pgtable_32.c:178 pmd

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Message-ID: <48207A13.7010205@goop.org>
Date:	Tue, 06 May 2008 16:32:35 +0100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>, Hugh Dickins <hugh@...itas.com>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Gabriel C <nix.or.die@...glemail.com>
Subject: Re: Linux 2.6.26-rc1 - pgtable_32.c:178 pmd_bad

Linus Torvalds wrote:
> You should have used a pagetable-specific macro, becuse PAGE_MASK is 
> simply fundamentally WRONG, and has absolutely nothing to do with the PFN 
> bits, whether sign-extended or not!
>
> The fact is, the page frane number bits are *not* ~PAGE_MASK or anything 
> like that. They share only the low bits - not the high bits.

Yes.  There's already a PTE_MASK for masking out the PFN vs the flags in 
a pte, but it isn't used consistently (perhaps at all).

    J
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