From: Matthew Wilcox <willy@infradead.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Michel Lespinasse <walken@google.com>,
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>,
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>
Subject: Re: [PATCH 1/8] mmap locking API: initial implementation as rwsem wrappers
Date: Thu, 26 Mar 2020 11:06:21 -0700 [thread overview]
Message-ID: <20200326180621.GK22483@bombadil.infradead.org> (raw)
In-Reply-To: <20200326175644.GN20941@ziepe.ca>
On Thu, Mar 26, 2020 at 02:56:44PM -0300, Jason Gunthorpe wrote:
> On Thu, Mar 26, 2020 at 12:02:29AM -0700, Michel Lespinasse wrote:
>
> > +static inline bool mmap_is_locked(struct mm_struct *mm)
> > +{
> > + return rwsem_is_locked(&mm->mmap_sem) != 0;
> > +}
>
> I've been wondering if the various VM_BUG(rwsem_is_locked()) would be
> better as lockdep expressions? Certainly when lockdep is enabled it
> should be preferred, IMHO.
>
> So, I think if inlines are to be introduced this should be something
> similar to netdev's ASSERT_RTNL which seems to have worked well.
>
> Maybe ASSERT_MMAP_SEM_READ/WRITE/HELD() and do the VM_BUG or
> lockdep_is_held as appropriate?
I'd rather see lockdep_assert_held() used directly rather than have
a wrapper. This API includes options to check for it beind explicitly
held for read/write/any, which should be useful.
next prev parent reply other threads:[~2020-03-26 18:06 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-26 7:02 [PATCH 0/8] Add a new mmap locking API wrapping mmap_sem calls Michel Lespinasse
2020-03-26 7:02 ` [PATCH 1/8] mmap locking API: initial implementation as rwsem wrappers Michel Lespinasse
2020-03-26 17:56 ` Jason Gunthorpe
2020-03-26 18:06 ` Matthew Wilcox [this message]
2020-03-26 18:09 ` Matthew Wilcox
2020-03-26 22:09 ` Michel Lespinasse
2020-03-26 7:02 ` [PATCH 2/8] MMU notifier: use the new mmap locking API Michel Lespinasse
2020-03-26 7:02 ` [PATCH 3/8] mmap locking API: use coccinelle to convert mmap_sem rwsem call sites Michel Lespinasse
2020-03-27 0:01 ` kbuild test robot
2020-03-27 0:40 ` kbuild test robot
2020-03-26 7:02 ` [PATCH 4/8] mmap locking API: convert mmap_sem call sites missed by coccinelle Michel Lespinasse
2020-03-26 23:13 ` kbuild test robot
2020-03-26 23:27 ` kbuild test robot
2020-03-26 7:02 ` [PATCH 5/8] mmap locking API: convert nested write lock sites Michel Lespinasse
2020-03-26 12:09 ` Matthew Wilcox
2020-03-26 12:56 ` Michel Lespinasse
2020-03-26 7:02 ` [PATCH 6/8] mmap locking API: add mmap_read_release() and mmap_read_unlock_non_owner() Michel Lespinasse
2020-03-26 7:02 ` [PATCH 7/8] mmap locking API: add MMAP_LOCK_INITIALIZER Michel Lespinasse
2020-04-06 9:46 ` Laurent Dufour
2020-04-06 13:04 ` Michel Lespinasse
2020-03-26 7:02 ` [PATCH 8/8] mmap locking API: rename mmap_sem to mmap_lock Michel Lespinasse
2020-04-06 12:45 ` Laurent Dufour
2020-04-06 13:17 ` Michel Lespinasse
2020-04-06 16:03 ` Davidlohr Bueso
2020-03-26 7:13 ` [PATCH 0/8] Add a new mmap locking API wrapping mmap_sem calls Michel Lespinasse
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