From: "Michal Koutný" <mkoutny@suse.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Bartosz Golaszewski <brgl@bgdev.pl>,
Arun KS <arunks@codeaurora.org>,
Geert Uytterhoeven <geert+renesas@glider.be>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Mike Rapoport <rppt@linux.ibm.com>,
Mateusz Guzik <mguzik@redhat.com>,
Vlastimil Babka <vbabka@suse.cz>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: get_cmdline use arg_lock instead of mmap_sem
Date: Wed, 17 Apr 2019 16:41:42 +0200 [thread overview]
Message-ID: <20190417144142.GF8962@blackbody.suse.cz> (raw)
In-Reply-To: <20190417134152.GM5878@dhcp22.suse.cz>
On Wed, Apr 17, 2019 at 03:41:52PM +0200, Michal Hocko <mhocko@kernel.org> wrote:
> Don't we need to use the lock in prctl_set_mm as well then?
Correct. The patch alone just moves the race from
get_cmdline/prctl_set_mm_map to get_cmdline/prctl_set_mm.
arg_lock could be used in prctl_set_mm but the better idea (IMO) is
complete removal of that code in favor of prctl_set_mm_map [1].
Michal
[1] https://lore.kernel.org/lkml/20180405182651.GM15783@uranus.lan/
next prev parent reply other threads:[~2019-04-17 14:41 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-17 12:03 [PATCH] mm: get_cmdline use arg_lock instead of mmap_sem Michal Koutný
2019-04-17 13:41 ` Michal Hocko
2019-04-17 14:41 ` Michal Koutný [this message]
2019-04-17 14:55 ` Michal Hocko
2019-04-18 13:50 ` [PATCH] prctl_set_mm: downgrade mmap_sem to read lock Michal Koutný
2019-04-18 14:09 ` Cyrill Gorcunov
2019-04-18 14:15 ` Michal Hocko
2019-04-18 14:27 ` Laurent Dufour
2019-04-18 18:23 ` Cyrill Gorcunov
2019-04-30 8:18 ` [PATCH 0/3] Reduce mmap_sem usage for args manipulation Michal Koutný
2019-04-30 8:18 ` [PATCH 1/3] mm: get_cmdline use arg_lock instead of mmap_sem Michal Koutný
2019-04-30 9:09 ` Kirill Tkhai
2019-04-30 9:38 ` Cyrill Gorcunov
2019-04-30 9:53 ` Kirill Tkhai
2019-04-30 10:45 ` Cyrill Gorcunov
2019-04-30 10:56 ` Michal Koutný
2019-04-30 13:24 ` Cyrill Gorcunov
2019-04-30 8:18 ` [PATCH 2/3] prctl_set_mm: Refactor checks from validate_prctl_map Michal Koutný
2019-04-30 9:27 ` Kirill Tkhai
2019-04-30 8:18 ` [PATCH 3/3] prctl_set_mm: downgrade mmap_sem to read lock Michal Koutný
2019-04-30 8:55 ` Kirill Tkhai
2019-04-30 9:08 ` Cyrill Gorcunov
2019-04-30 9:11 ` Kirill Tkhai
2019-05-02 12:52 ` [PATCH v3 0/2] Reduce mmap_sem usage for args manipulation Michal Koutný
2019-05-02 12:52 ` [PATCH v3 1/2] prctl_set_mm: Refactor checks from validate_prctl_map Michal Koutný
2019-05-02 20:57 ` Cyrill Gorcunov
2019-05-02 12:52 ` [PATCH v3 2/2] prctl_set_mm: downgrade mmap_sem to read lock Michal Koutný
2019-05-02 20:57 ` Cyrill Gorcunov
2019-05-06 9:28 ` Kirill Tkhai
2019-05-07 17:42 ` Michal Hocko
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