linux-kernel - Re: [Patch] mmu_notifiers destroyed by __mmu_notifier_release() retain extra mm

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Message-ID: <20090206125845.GC8559@sgi.com>
Date:	Fri, 6 Feb 2009 06:58:45 -0600
From:	Robin Holt <holt@....com>
To:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Robin Holt <holt@....com>, linux-mm@...ck.org,
	Nick Piggin <npiggin@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [Patch] mmu_notifiers destroyed by __mmu_notifier_release()
	retain extra mm_count.

On Fri, Feb 06, 2009 at 02:44:00AM +0100, Andrea Arcangeli wrote:
> simply. For a moment I thought unregister wasn't mandatory because at
> some point in one of the dozen versions of the api it wasn't, but in

You are right, I am remembering an older version of the API (which I
still like better, obviously ;) ).  I also see the problems each choice
of API can cause.  I think the current API is the more reasonable
choice.  I have adjusted XPMEM to keep a copy of the mm_struct pointer
at register time with my own accompanying inc of mm_count and likewise
do the unregister and mmdrop();  This resolved my problem.

Sorry for the noise.

Andrew, could you throw this patch as away as quickly as possible.
Sorry for wasting your time.

Thanks,
Robin
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