From: Andrew Morton <akpm@linux-foundation.org>
To: John Hubbard <jhubbard@nvidia.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, Alistair Popple <apopple@nvidia.com>,
Shigeru Yoshida <syoshida@redhat.com>,
David Hildenbrand <david@redhat.com>,
Jason Gunthorpe <jgg@nvidia.com>,
Minchan Kim <minchan@kernel.org>,
Pasha Tatashin <pasha.tatashin@soleen.com>
Subject: Re: [PATCH] mm/gup: stop leaking pinned pages in low memory conditions
Date: Wed, 16 Oct 2024 15:41:27 -0700 [thread overview]
Message-ID: <20241016154127.3e369be7398bd0c3db27e8e3@linux-foundation.org> (raw)
In-Reply-To: <5e499b63-8b38-4ddc-82ab-848301fd8d2b@nvidia.com>
On Wed, 16 Oct 2024 15:05:28 -0700 John Hubbard <jhubbard@nvidia.com> wrote:
> On 10/16/24 2:57 PM, Andrew Morton wrote:
> > On Wed, 16 Oct 2024 13:22:42 -0700 John Hubbard <jhubbard@nvidia.com> wrote:
> ...
> >> Fix this by unpinning the pages that __get_user_pages_locked() has
> >> pinned, in such error cases.
> >
> > Thanks.
> >
> >> Fixes: 24a95998e9ba ("mm/gup.c: simplify and fix check_and_migrate_movable_pages() return codes")
> >
> > I'll add this to the -stable backport pile, although this seems a bit
> > marginal?
>
> I'm on the fence about that. It is marginal: you have to
> exhaust memory. On the other hand, a real user reported
> this bug to us.
>
> I guess I'd lean toward "correctness in -stable", and
> add it to the pile, in the end.
Thanks. It's a super-simple patch, which helps the decision.
next prev parent reply other threads:[~2024-10-16 22:41 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-16 20:22 John Hubbard
2024-10-16 21:57 ` Andrew Morton
2024-10-16 22:05 ` John Hubbard
2024-10-16 22:41 ` Andrew Morton [this message]
2024-10-16 22:13 ` Alistair Popple
2024-10-16 22:22 ` John Hubbard
2024-10-17 8:51 ` David Hildenbrand
2024-10-17 8:53 ` David Hildenbrand
2024-10-17 17:06 ` John Hubbard
2024-10-17 17:10 ` David Hildenbrand
2024-10-17 16:54 ` John Hubbard
2024-10-17 21:28 ` Alistair Popple
2024-10-17 21:47 ` David Hildenbrand
2024-10-17 21:57 ` John Hubbard
2024-10-17 22:03 ` David Hildenbrand
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