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From: Andrew Morton <akpm@linux-foundation.org>
To: jglisse@redhat.com
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Ralph Campbell <rcampbell@nvidia.com>,
	stable@vger.kernel.org, Evgeny Baskakov <ebaskakov@nvidia.com>,
	Mark Hairgrove <mhairgrove@nvidia.com>,
	John Hubbard <jhubbard@nvidia.com>
Subject: Re: [PATCH 03/14] mm/hmm: HMM should have a callback before MM is destroyed v2
Date: Fri, 16 Mar 2018 14:12:21 -0700	[thread overview]
Message-ID: <20180316141221.f2b622630de3f1da51a5c105@linux-foundation.org> (raw)
In-Reply-To: <20180316191414.3223-4-jglisse@redhat.com>

On Fri, 16 Mar 2018 15:14:08 -0400 jglisse@redhat.com wrote:

> The hmm_mirror_register() function registers a callback for when
> the CPU pagetable is modified. Normally, the device driver will
> call hmm_mirror_unregister() when the process using the device is
> finished. However, if the process exits uncleanly, the struct_mm
> can be destroyed with no warning to the device driver.

Again, what are the user-visible effects of the bug?  Such info is
needed when others review our request for a -stable backport.  And the
many people who review -stable patches for integration into their own
kernel trees will want to understand the benefit of the patch to their
users.

  reply	other threads:[~2018-03-16 21:12 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-16 19:14 [PATCH 0/4] hmm: fixes and documentations v2 jglisse
2018-03-16 19:14 ` jglisse
2018-03-16 19:14 ` [PATCH 01/14] mm/hmm: documentation editorial update to HMM documentation jglisse
2018-03-16 19:14   ` jglisse
2018-03-16 19:14 ` [PATCH 02/14] mm/hmm: fix header file if/else/endif maze jglisse
2018-03-16 19:14   ` jglisse
2018-03-16 21:09   ` Andrew Morton
2018-03-16 21:18     ` Jerome Glisse
2018-03-16 21:18       ` Jerome Glisse
2018-03-16 21:18       ` Jerome Glisse
2018-03-16 21:35       ` Andrew Morton
2018-03-16 21:40         ` John Hubbard
2018-03-16 21:40           ` John Hubbard
2018-03-17  1:20   ` [PATCH 02/14] mm/hmm: fix header file if/else/endif maze v2 jglisse
2018-03-17  1:20     ` jglisse
2018-03-16 19:14 ` [PATCH 03/14] mm/hmm: HMM should have a callback before MM is destroyed v2 jglisse
2018-03-16 19:14   ` jglisse
2018-03-16 21:12   ` Andrew Morton [this message]
2018-03-16 21:26     ` Jerome Glisse
2018-03-16 21:26       ` Jerome Glisse
2018-03-16 21:26       ` Jerome Glisse
2018-03-16 21:37       ` John Hubbard
2018-03-16 21:37         ` John Hubbard
2018-03-17  2:36   ` John Hubbard
2018-03-17  2:36     ` John Hubbard
2018-03-17  3:47     ` John Hubbard
2018-03-17  3:47       ` John Hubbard
2018-03-17  4:39       ` John Hubbard
2018-03-17  4:39         ` John Hubbard
2018-03-16 19:14 ` [PATCH 04/14] mm/hmm: hmm_pfns_bad() was accessing wrong struct jglisse
2018-03-16 19:14   ` jglisse
2018-03-17  2:04   ` John Hubbard
2018-03-17  2:04     ` John Hubbard
2018-03-16 19:14 ` [PATCH 05/14] mm/hmm: use struct for hmm_vma_fault(), hmm_vma_get_pfns() parameters jglisse
2018-03-16 19:14   ` jglisse
2018-03-17  3:08   ` John Hubbard
2018-03-17  3:08     ` John Hubbard
2018-03-16 19:14 ` [PATCH 06/14] mm/hmm: remove HMM_PFN_READ flag and ignore peculiar architecture jglisse
2018-03-16 19:14   ` jglisse
2018-03-17  3:30   ` John Hubbard
2018-03-17  3:30     ` John Hubbard
2018-03-16 19:14 ` [PATCH 07/14] mm/hmm: use uint64_t for HMM pfn instead of defining hmm_pfn_t to ulong jglisse
2018-03-16 19:14   ` jglisse
2018-03-17  3:59   ` John Hubbard
2018-03-17  3:59     ` John Hubbard
2018-03-16 19:14 ` [PATCH 08/14] mm/hmm: cleanup special vma handling (VM_SPECIAL) jglisse
2018-03-16 19:14   ` jglisse
2018-03-17  4:35   ` John Hubbard
2018-03-17  4:35     ` John Hubbard
2018-03-16 19:14 ` [PATCH 09/14] mm/hmm: do not differentiate between empty entry or missing directory jglisse
2018-03-16 19:14   ` jglisse
2018-03-19 23:06   ` John Hubbard
2018-03-19 23:06     ` John Hubbard
2018-03-20  2:08     ` Jerome Glisse
2018-03-20  2:08       ` Jerome Glisse

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