linux-kernel - Re: [PATCH v2 09/10] mmap locking API: use lockdep_assert

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Date:   Thu, 26 Mar 2020 21:48:30 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Michel Lespinasse <walken@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Liam Howlett <Liam.Howlett@...cle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Hugh Dickins <hughd@...gle.com>, Ying Han <yinghan@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Markus Elfring <Markus.Elfring@....de>
Subject: Re: [PATCH v2 09/10] mmap locking API: use lockdep_assert_held

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