linux-kernel - Re: Oops with DCACHE_WORD

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Message-ID: <CA+55aFwvs8LHmThhMD14BJZ27JpQdD_xCytaDUeuCQJAy94LVQ@mail.gmail.com>
Date:	Wed, 2 May 2012 22:57:58 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Nick Piggin <npiggin@...il.com>, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...nel.org>
Cc:	Jana Saout <jana@...ut.de>, Joel Becker <jlbec@...lplan.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Oops with DCACHE_WORD_ACCESS and ocfs2, autofs4

Forgot to actually add Peter and Ingo to the cc..

                    Linus

On Wed, May 2, 2012 at 10:57 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> The word-at-a-time code assumes that no allocation will be the last
> page (whether kmalloc or normal page allocation), which was always
> somewhat optimistic but I thought it would be true on PC's.
>
> And that %rbp value does *not* look like end-of-memory, but maybe
> there is something else than just the CONFIG_DEBUG_PAGEALLOC that
> causes us to punch holes even in the kernel memory map.
>
> Peter, Ingo - do we unmap kernel pages for PAT etc attributes?
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