From: Michel Lespinasse <walken@google.com>
To: Laurent Dufour <ldufour@linux.ibm.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>,
Vlastimil Babka <vbabka@suse.cz>,
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>
Subject: Re: [PATCH 7/8] mmap locking API: add MMAP_LOCK_INITIALIZER
Date: Mon, 6 Apr 2020 06:04:16 -0700 [thread overview]
Message-ID: <CANN689GOqEnLQHD-VNjwhTCwvLWNsRPLmo+yBumzE_y2_YsoMQ@mail.gmail.com> (raw)
In-Reply-To: <1c463464-1d72-287e-e785-f077a95ccf20@linux.ibm.com>
On Mon, Apr 6, 2020 at 2:46 AM Laurent Dufour <ldufour@linux.ibm.com> wrote:
>
> Le 26/03/2020 à 08:02, Michel Lespinasse a écrit :
> > Define a new initializer for the mmap locking api.
> > Initially this just evaluates to __RWSEM_INITIALIZER as the API
> > is defined as wrappers around rwsem.
>
> I can't see the benefit of this change.
> The overall idea is to hide the mmap_sem name. Here the macro
> MMAP_LOCK_INITIALIZER() doesn't hide the name.
The idea for the initializer is that it makes it easier to change the
underlying implementation - if we do, we can change the initializer
without having to change every place where it is used. I actually do
that in my other patch series converting the mmap_sem to a range lock.
But you are correct that it does not help with renaming the mmap_sem
field - my next commit in this series still has to do that in every
place this initializer is used.
next prev parent reply other threads:[~2020-04-06 13:04 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
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 [this message]
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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