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From: Davidlohr Bueso <dave@stgolabs.net>
To: Michel Lespinasse <walken@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-mm <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Laurent Dufour <ldufour@linux.ibm.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Matthew Wilcox <willy@infradead.org>,
	Liam Howlett <Liam.Howlett@oracle.com>,
	Jerome Glisse <jglisse@redhat.com>,
	David Rientjes <rientjes@google.com>,
	Hugh Dickins <hughd@google.com>, Ying Han <yinghan@google.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Markus Elfring <Markus.Elfring@web.de>
Subject: Re: [PATCH v2 09/10] mmap locking API: use lockdep_assert_held
Date: Thu, 26 Mar 2020 21:48:30 -0700
Message-ID: <20200327044830.qw74dvaxkjg75fh5@linux-p48b> (raw)
In-Reply-To: <20200327021058.221911-10-walken@google.com>

On Thu, 26 Mar 2020, Michel Lespinasse wrote:

>Use lockdep_assert_held when asserting that mmap_sem is held.
>
>Using this instead of rwsem_is_locked makes the assertions more
>tolerant of future changes to the lock type.

Not opposing here, just worth mentioning that the coverage surface
is greatly reduced, lockdep not being very popular in production.

Thanks,
Davidlohr


  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-27  2:10 [PATCH v2 00/10] Add a new mmap locking API wrapping mmap_sem calls Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 01/10] mmap locking API: initial implementation as rwsem wrappers Michel Lespinasse
2020-03-27 12:16   ` Jason Gunthorpe
2020-03-27 21:52     ` Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 02/10] MMU notifier: use the new mmap locking API Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 03/10] DMA reservations: " Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 04/10] mmap locking API: use coccinelle to convert mmap_sem rwsem call sites Michel Lespinasse
2020-03-27  7:22   ` Markus Elfring
2020-03-27  7:44     ` Michel Lespinasse
2020-03-27  8:00       ` [v2 " Markus Elfring
2020-03-27  8:08         ` Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 05/10] mmap locking API: convert mmap_sem call sites missed by coccinelle Michel Lespinasse
2020-03-27  8:21   ` Markus Elfring
2020-03-27  2:10 ` [PATCH v2 06/10] mmap locking API: convert nested write lock sites Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 07/10] mmap locking API: add mmap_read_release() and mmap_read_unlock_non_owner() Michel Lespinasse
2020-03-27  4:46   ` Davidlohr Bueso
2020-03-27  5:09     ` Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 08/10] mmap locking API: add MMAP_LOCK_INITIALIZER Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 09/10] mmap locking API: use lockdep_assert_held Michel Lespinasse
2020-03-27  4:48   ` Davidlohr Bueso [this message]
2020-03-27  2:10 ` [PATCH v2 10/10] mmap locking API: rename mmap_sem to mmap_lock Michel Lespinasse

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