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Message-ID: <CANN689HPPP3kKNFpm5ymJhk-FODN1nXgMHouZ5-v1m=BJ+HyJg@mail.gmail.com>
Date: Wed, 30 Sep 2020 16:24:39 -0700
From: Michel Lespinasse <walken@...gle.com>
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: Jann Horn <jannh@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-mm <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: Re: [PATCH 4/4] mm/gup: Assert that the mmap lock is held in __get_user_pages()
On Wed, Sep 30, 2020 at 5:32 AM Jason Gunthorpe <jgg@...pe.ca> wrote:
> On Tue, Sep 29, 2020 at 06:20:01PM -0700, Jann Horn wrote:
> > After having cleaned up all GUP callers (except for the atomisp staging
> > driver, which currently gets mmap locking completely wrong [1]) to always
> > ensure that they hold the mmap lock when calling into GUP (unless the mm is
> > not yet globally visible), add an assertion to make sure it stays that way
> > going forward.
Thanks for doing this, there is a lot of value in ensuring that a
function's callers follows the prerequisites.
Acked-by: Michel Lespinasse <walken@...gle.com>
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