linux-kernel - Re: oops in copy_page

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Message-ID: <CA+55aFzfUABPycR82aNQhHNasQkL1kmxLN1rD0DJcByFtead3g@mail.gmail.com>
Date:	Tue, 8 Jan 2013 07:37:06 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Hugh Dickins <hughd@...gle.com>, Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Linux-MM <linux-mm@...ck.org>
Subject: Re: oops in copy_page_rep()

On Tue, Jan 8, 2013 at 5:04 AM, Hillf Danton <dhillf@...il.com> wrote:
> On Tue, Jan 8, 2013 at 1:34 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>>
>> Hmm. Is there some reason we never need to worry about it for the
>> "pmd_numa()" case just above?
>>
>> A comment about this all might be a really good idea.
>>
> Yes Sir, added.

Heh. I was more thinking about why do_huge_pmd_wp_page() needs it, but
do_huge_pmd_numa_page() does not.

Also, do we actually need it for huge_pmd_set_accessed()? The
*placement* of that thing confuses me. And because it confuses me, I'd
like to understand it.

                  Linus
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