From: Dan Williams <dan.j.williams@intel.com>
To: Jan Kara <jack@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Joonyoung Shim <jy0922.shim@samsung.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
Seung-Woo Kim <sw0312.kim@samsung.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
Inki Dae <inki.dae@samsung.com>, Linux MM <linux-mm@kvack.org>,
Kyungmin Park <kyungmin.park@samsung.com>,
Mel Gorman <mgorman@suse.de>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Vlastimil Babka <vbabka@suse.cz>,
"Linux-media@vger.kernel.org" <linux-media@vger.kernel.org>
Subject: Re: [PATCH v2 2/4] mm: fail get_vaddr_frames() for filesystem-dax mappings
Date: Mon, 27 Nov 2017 08:19:59 -0800 [thread overview]
Message-ID: <CAPcyv4iayd=dmq18he3EqW-2SO62-s93GLzf8FKWa9s_Pa1Tsw@mail.gmail.com> (raw)
In-Reply-To: <20171127161511.GE5977@quack2.suse.cz>
On Mon, Nov 27, 2017 at 8:15 AM, Jan Kara <jack@suse.cz> wrote:
> On Tue 14-11-17 11:56:39, Dan Williams wrote:
>> Until there is a solution to the dma-to-dax vs truncate problem it is
>> not safe to allow V4L2, Exynos, and other frame vector users to create
>> long standing / irrevocable memory registrations against filesytem-dax
>> vmas.
>>
>> Cc: Inki Dae <inki.dae@samsung.com>
>> Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
>> Cc: Joonyoung Shim <jy0922.shim@samsung.com>
>> Cc: Kyungmin Park <kyungmin.park@samsung.com>
>> Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
>> Cc: linux-media@vger.kernel.org
>> Cc: Jan Kara <jack@suse.cz>
>> Cc: Mel Gorman <mgorman@suse.de>
>> Cc: Vlastimil Babka <vbabka@suse.cz>
>> Cc: Andrew Morton <akpm@linux-foundation.org>
>> Cc: <stable@vger.kernel.org>
>> Fixes: 3565fce3a659 ("mm, x86: get_user_pages() for dax mappings")
>> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
>
> Makes sense. I'd just note that in principle get_vaddr_frames() is no more
> long-term than get_user_pages(). It is just so that all the users of
> get_vaddr_frames() currently want a long-term reference. Maybe could you
> add here also a comment that the vma_is_fsdax() check is there because all
> users of this function want a long term page reference? With that you can
> add:
Ok, will do.
> Reviewed-by: Jan Kara <jack@suse.cz>
Thanks.
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next prev parent reply other threads:[~2017-11-27 16:20 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-14 19:56 [PATCH v2 0/4] introduce get_user_pages_longterm() Dan Williams
2017-11-14 19:56 ` [PATCH v2 1/4] mm: introduce get_user_pages_longterm Dan Williams
2017-11-21 23:05 ` Andrew Morton
2017-11-21 23:26 ` Dan Williams
2017-11-21 23:11 ` Andrew Morton
2017-11-14 19:56 ` [PATCH v2 2/4] mm: fail get_vaddr_frames() for filesystem-dax mappings Dan Williams
2017-11-27 16:15 ` Jan Kara
2017-11-27 16:19 ` Dan Williams [this message]
2017-11-14 19:56 ` [PATCH v2 3/4] [media] v4l2: disable filesystem-dax mapping support Dan Williams
2017-11-27 16:17 ` Jan Kara
2017-11-14 19:56 ` [PATCH v2 4/4] IB/core: disable memory registration of fileystem-dax vmas Dan Williams
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