linux-kernel - Re: [PATCH 5/5] x86,mm: make pagefault killable

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Message-ID: <AANLkTimLbaMTHKiuWu5edS4Offf4KZv2TJ+g8BUgzLYt@mail.gmail.com>
Date:	Wed, 23 Mar 2011 07:34:43 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, linux-mm <linux-mm@...ck.org>,
	Andrey Vagin <avagin@...nvz.org>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 5/5] x86,mm: make pagefault killable

On Wed, Mar 23, 2011 at 1:09 AM, KOSAKI Motohiro
<kosaki.motohiro@...fujitsu.com> wrote:
>
> When __lock_page_or_retry() return 0, It call up_read(mmap_sem) in this
> function.

Indeed.

> I agree this is strange (or ugly). but I don't want change this spec in
> this time.

I agree that it is strange, and I don't like functions that touch
locks that they didn't take themselves, but since the original point
of the whole thing was to wait for the page without holding the
mmap_sem lock, that function has to do the up_read() early.

                   Linus
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