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Date: Tue, 12 Apr 2011 21:02:57 +0200
Message-ID: <BANLkTikdM2kF=qOy4d4bZ_wfb5ykEdkZPQ@mail.gmail.com>
Subject: Re: [PATCH] mm: fix possible cause of a page_mapped BUG
From: =?UTF-8?B?Um9iZXJ0IMWad2nEmWNraQ==?= <robert@swiecki.net>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>, Andrew Morton <akpm@linux-foundation.org>,
        Miklos Szeredi <miklos@szeredi.hu>,
        Michel Lespinasse <walken@google.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Rik van Riel <riel@redhat.com>
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On Tue, Apr 12, 2011 at 8:59 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> On Tue, Apr 12, 2011 at 10:19 AM, Linus Torvalds
> <torvalds@linux-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..

I'm testing currently with the old one, w/o any symptoms of problems
by now, but it's not a meaningful period of time. I can try with the
new one, leave it over(European)night, and let you know tomorrow.

-- 
Robert Święcki
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