From: Kirill Tkhai <ktkhai@virtuozzo.com>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: "Michal Koutný" <mkoutny@suse.com>,
akpm@linux-foundation.org, arunks@codeaurora.org, brgl@bgdev.pl,
geert+renesas@glider.be, ldufour@linux.ibm.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
mguzik@redhat.com, mhocko@kernel.org, rppt@linux.ibm.com,
vbabka@suse.cz
Subject: Re: [PATCH 3/3] prctl_set_mm: downgrade mmap_sem to read lock
Date: Tue, 30 Apr 2019 12:11:37 +0300 [thread overview]
Message-ID: <0a48e0a2-a282-159e-a56e-201fbc0faa91@virtuozzo.com> (raw)
In-Reply-To: <20190430090808.GC2673@uranus.lan>
On 30.04.2019 12:08, Cyrill Gorcunov wrote:
> On Tue, Apr 30, 2019 at 11:55:45AM +0300, Kirill Tkhai wrote:
>>> - up_write(&mm->mmap_sem);
>>> + spin_unlock(&mm->arg_lock);
>>> + up_read(&mm->mmap_sem);
>>> return error;
>>
>> Hm, shouldn't spin_lock()/spin_unlock() pair go as a fixup to existing code
>> in a separate patch?
>>
>> Without them, the existing code has a problem at least in get_mm_cmdline().
>
> Seems reasonable to merge it into patch 1.
Sounds sensibly.
next prev parent reply other threads:[~2019-04-30 9:11 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
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 [this message]
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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