linux-kernel - Re: [PATCH] mm: fix possible cause of a page

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Message-ID: <BANLkTiktvcBWsLKEk5iBYVEbPJS3i+U+hA@mail.gmail.com>
Date:	Tue, 12 Apr 2011 11:59:18 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Robert Święcki <robert@...ecki.net>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	Michel Lespinasse <walken@...gle.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH] mm: fix possible cause of a page_mapped BUG

On Tue, Apr 12, 2011 at 10:19 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> THIS IS A HACKY AND UNTESTED PATCH!

.. and here is a rather less hacky, but still equally untested patch.
It moves the stack guard page handling into __get_user_pages() itself,
and thus avoids the whole problem.

This one I could easily see myself committing. Assuming I get some
ack's and testing..

Comments?

                          Linus

View attachment "patch.diff" of type "text/x-patch" (3078 bytes)