linux-kernel - Re: [PATCH 1/6] mmput: use notifier chain to call subsystem exit handler.

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Date:	Mon, 30 Jun 2014 17:37:26 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Jérôme Glisse <j.glisse@...il.com>
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, mgorman@...e.de, hpa@...or.com,
	peterz@...raread.org, aarcange@...hat.com, riel@...hat.com,
	jweiner@...hat.com, torvalds@...ux-foundation.org,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Jatin Kumar <jakumar@...dia.com>,
	Subhash Gutti <sgutti@...dia.com>,
	Lucien Dunning <ldunning@...dia.com>,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Arvind Gopalakrishnan <arvindg@...dia.com>,
	John Hubbard <jhubbard@...dia.com>,
	Sherry Cheung <SCheung@...dia.com>,
	Duncan Poole <dpoole@...dia.com>,
	Oded Gabbay <Oded.Gabbay@....com>,
	Alexander Deucher <Alexander.Deucher@....com>,
	Andrew Lewycky <Andrew.Lewycky@....com>,
	Jérôme Glisse <jglisse@...hat.com>
Subject: Re: [PATCH 1/6] mmput: use notifier chain to call subsystem exit
 handler.

On Fri, Jun 27, 2014 at 10:00:19PM -0400, Jérôme Glisse wrote:
> Note that this patch also move the call to cleanup functions after
> exit_mmap so that new call back can assume that mmu_notifier_release
> have already been call. This does not impact existing cleanup functions
> as they do not rely on anything that exit_mmap is freeing. Also moved
> khugepaged_exit to exit_mmap so that ordering is preserved for that
> function.

What this patch does is duplicating the functionality of the
mmu_notifier_release call-back. Why is it needed?


	Joerg


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