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From: Vlastimil Babka <vbabka@suse.cz>
To: Andrew Morton <akpm@linux-foundation.org>,
	Michel Lespinasse <walken@google.com>
Cc: linux-mm <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Laurent Dufour <ldufour@linux.ibm.com>,
	Matthew Wilcox <willy@infradead.org>,
	Liam Howlett <Liam.Howlett@oracle.com>,
	Jerome Glisse <jglisse@redhat.com>,
	Davidlohr Bueso <dave@stgolabs.net>,
	David Rientjes <rientjes@google.com>,
	Hugh Dickins <hughd@google.com>, Ying Han <yinghan@google.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Daniel Jordan <daniel.m.jordan@oracle.com>,
	John Hubbard <jhubbard@nvidia.com>
Subject: Re: [PATCH v6 12/12] mmap locking API: convert mmap_sem comments
Date: Fri, 22 May 2020 16:21:57 +0200	[thread overview]
Message-ID: <9858cd98-b303-beb4-82f6-52f902f98772@suse.cz> (raw)
In-Reply-To: <20200521102516.01dbc9fcc539baba96224c3f@linux-foundation.org>

On 5/21/20 7:25 PM, Andrew Morton wrote:
> On Thu, 21 May 2020 00:50:56 -0700 Michel Lespinasse <walken@google.com> wrote:
> 
>> > >   * Must be called holding task's alloc_lock to protect task's mems_allowed
>> > > - * and mempolicy.  May also be called holding the mmap_semaphore for write.
>> > > + * and mempolicy.  May also be called holding the mmap_lockaphore for write.
>> > >   */
>> > >  static int mpol_set_nodemask(struct mempolicy *pol,
>> > >                    const nodemask_t *nodes, struct nodemask_scratch *nsc)
>> >
>> > :)
>> 
>> Haha, good catch !
> 
> aww, you're all so cruel.  The world would be a better place if Linux
> had lockaphores!

Heh, in fact it does have them, but they are called "btrfs extent buffer locks",
see (or perhaps rather not) fs/btrfs/locking.c :)





  reply	other threads:[~2020-05-22 14:22 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-20  5:28 [PATCH v6 00/12] Add a new mmap locking API wrapping mmap_sem calls Michel Lespinasse
2020-05-20  5:28 ` [PATCH v6 01/12] mmap locking API: initial implementation as rwsem wrappers Michel Lespinasse
2020-05-20  5:28 ` [PATCH v6 02/12] MMU notifier: use the new mmap locking API Michel Lespinasse
2020-05-20  5:28 ` [PATCH v6 03/12] DMA reservations: " Michel Lespinasse
2020-05-20  5:29 ` [PATCH v6 04/12] mmap locking API: use coccinelle to convert mmap_sem rwsem call sites Michel Lespinasse
2020-05-20  5:29 ` [PATCH v6 05/12] mmap locking API: convert mmap_sem call sites missed by coccinelle Michel Lespinasse
2020-05-21  3:23   ` Andrew Morton
2020-05-21  4:49     ` Michel Lespinasse
2020-05-20  5:29 ` [PATCH v6 06/12] mmap locking API: convert nested write lock sites Michel Lespinasse
2020-05-20  5:29 ` [PATCH v6 07/12] mmap locking API: add mmap_read_trylock_non_owner() Michel Lespinasse
2020-05-22 14:15   ` Davidlohr Bueso
2020-05-20  5:29 ` [PATCH v6 08/12] mmap locking API: add MMAP_LOCK_INITIALIZER Michel Lespinasse
2020-05-29 20:17   ` Daniel Jordan
2020-05-20  5:29 ` [PATCH v6 09/12] mmap locking API: add mmap_assert_locked() and mmap_assert_write_locked() Michel Lespinasse
2020-05-21  7:35   ` Vlastimil Babka
2020-05-29 20:36   ` Daniel Jordan
2020-05-20  5:29 ` [PATCH v6 10/12] mmap locking API: rename mmap_sem to mmap_lock Michel Lespinasse
2020-05-22 14:16   ` Davidlohr Bueso
2020-05-29 20:42   ` Daniel Jordan
2020-05-20  5:29 ` [PATCH v6 11/12] mmap locking API: convert mmap_sem API comments Michel Lespinasse
2020-05-21  7:38   ` Vlastimil Babka
2020-05-22 14:13   ` Davidlohr Bueso
2020-05-29 20:50   ` Daniel Jordan
2020-05-20  5:29 ` [PATCH v6 12/12] mmap locking API: convert mmap_sem comments Michel Lespinasse
2020-05-21  3:22   ` Andrew Morton
2020-05-21  4:51     ` Michel Lespinasse
2020-05-21  7:41   ` Vlastimil Babka
2020-05-21  7:50     ` Michel Lespinasse
2020-05-21 17:25       ` Andrew Morton
2020-05-22 14:21         ` Vlastimil Babka [this message]
2020-05-29 21:16   ` Daniel Jordan
2020-06-09 12:03 ` [PATCH v6 00/12] Add a new mmap locking API wrapping mmap_sem calls Michal Hocko

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