From: Michel Lespinasse <walken@google.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jann Horn <jannh@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
"Eric W . Biederman" <ebiederm@xmission.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Sakari Ailus <sakari.ailus@linux.intel.com>
Subject: Re: [PATCH 4/4] mm/gup: Assert that the mmap lock is held in __get_user_pages()
Date: Wed, 30 Sep 2020 16:24:39 -0700 [thread overview]
Message-ID: <CANN689HPPP3kKNFpm5ymJhk-FODN1nXgMHouZ5-v1m=BJ+HyJg@mail.gmail.com> (raw)
In-Reply-To: <20200930123217.GD9916@ziepe.ca>
On Wed, Sep 30, 2020 at 5:32 AM Jason Gunthorpe <jgg@ziepe.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@google.com>
next prev parent reply other threads:[~2020-09-30 23:24 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200930011944.19869-1-jannh@google.com>
2020-09-30 1:20 ` [PATCH 2/4] binfmt_elf: Take the mmap lock around find_extend_vma() Jann Horn
2020-09-30 1:20 ` Jann Horn
2020-09-30 23:22 ` Michel Lespinasse
2020-09-30 23:22 ` Michel Lespinasse
2020-09-30 1:20 ` [PATCH 3/4] mmap locking API: Don't check locking if the mm isn't live yet Jann Horn
2020-09-30 1:20 ` Jann Horn
2020-09-30 12:30 ` Jason Gunthorpe
2020-09-30 12:50 ` Jann Horn
2020-09-30 12:50 ` Jann Horn
2020-09-30 20:14 ` Jann Horn
2020-09-30 20:14 ` Jann Horn
2020-09-30 23:26 ` Jason Gunthorpe
2020-09-30 23:51 ` Jann Horn
2020-09-30 23:51 ` Jann Horn
2020-10-01 19:15 ` Jason Gunthorpe
2020-10-01 20:16 ` Jann Horn
2020-10-01 20:16 ` Jann Horn
2020-10-01 23:41 ` Jason Gunthorpe
2020-10-01 23:55 ` Jann Horn
2020-10-01 23:55 ` Jann Horn
2020-09-30 23:42 ` Michel Lespinasse
2020-09-30 23:42 ` Michel Lespinasse
2020-09-30 1:20 ` [PATCH 4/4] mm/gup: Assert that the mmap lock is held in __get_user_pages() Jann Horn
2020-09-30 1:20 ` Jann Horn
2020-09-30 12:32 ` Jason Gunthorpe
2020-09-30 23:24 ` Michel Lespinasse [this message]
2020-09-30 23:24 ` Michel Lespinasse
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