From: Jerome Glisse <jglisse@redhat.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
Leon Romanovsky <leonro@mellanox.com>,
Doug Ledford <dledford@redhat.com>,
Artemy Kovalyov <artemyko@mellanox.com>,
Moni Shoua <monis@mellanox.com>,
Mike Marciniszyn <mike.marciniszyn@intel.com>,
Kaike Wan <kaike.wan@intel.com>,
Dennis Dalessandro <dennis.dalessandro@intel.com>
Subject: Re: [PATCH v4 0/1] Use HMM for ODP v4
Date: Thu, 23 May 2019 15:39:59 -0400 [thread overview]
Message-ID: <20190523193959.GA5658@redhat.com> (raw)
In-Reply-To: <20190523191038.GG12159@ziepe.ca>
On Thu, May 23, 2019 at 04:10:38PM -0300, Jason Gunthorpe wrote:
>
> On Thu, May 23, 2019 at 02:24:58PM -0400, Jerome Glisse wrote:
> > I can not take mmap_sem in range_register, the READ_ONCE is fine and
> > they are no race as we do take a reference on the hmm struct thus
>
> Of course there are use after free races with a READ_ONCE scheme, I
> shouldn't have to explain this.
Well i can not think of anything again here the mm->hmm can not
change while driver is calling hmm_range_register() so if you
want i can remove the READ_ONCE() this does not change anything.
> If you cannot take the read mmap sem (why not?), then please use my
> version and push the update to the driver through -mm..
Please see previous threads on why it was a failure.
Cheers,
Jérôme
next prev parent reply other threads:[~2019-05-23 19:39 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-11 18:13 [PATCH v4 0/1] Use HMM for ODP v4 jglisse
2019-04-11 18:13 ` [PATCH v4 1/1] RDMA/odp: convert to use " jglisse
2019-05-06 19:56 ` [PATCH v4 0/1] Use " Jason Gunthorpe
2019-05-21 20:53 ` Jerome Glisse
2019-05-21 20:53 ` Jerome Glisse
2019-05-22 0:52 ` Jason Gunthorpe
2019-05-22 17:48 ` Jerome Glisse
2019-05-22 17:48 ` Jerome Glisse
2019-05-22 18:32 ` Jason Gunthorpe
2019-05-22 19:22 ` Jason Gunthorpe
2019-05-22 21:49 ` Jerome Glisse
2019-05-22 22:43 ` Jason Gunthorpe
2019-05-22 20:12 ` Jason Gunthorpe
2019-05-22 20:12 ` Jason Gunthorpe
2019-05-22 21:12 ` Ralph Campbell
2019-05-22 21:12 ` Ralph Campbell
2019-05-22 22:06 ` Jerome Glisse
2019-05-22 22:04 ` Jerome Glisse
2019-05-22 22:39 ` Jason Gunthorpe
2019-05-22 22:42 ` Jerome Glisse
2019-05-22 22:52 ` Jason Gunthorpe
2019-05-22 23:57 ` Jason Gunthorpe
2019-05-23 15:04 ` Jerome Glisse
2019-05-23 15:41 ` Jason Gunthorpe
2019-05-23 15:52 ` Jerome Glisse
2019-05-23 16:34 ` Jason Gunthorpe
2019-05-23 17:33 ` Jerome Glisse
2019-05-23 17:55 ` Jason Gunthorpe
2019-05-23 18:24 ` Jerome Glisse
2019-05-23 19:10 ` Jason Gunthorpe
2019-05-23 19:39 ` Jerome Glisse [this message]
2019-05-23 19:47 ` Jason Gunthorpe
2019-05-24 6:40 ` Christoph Hellwig
2019-05-24 12:44 ` RFC: Run a dedicated hmm.git for 5.3 Jason Gunthorpe
2019-05-24 16:27 ` Daniel Vetter
2019-05-24 16:53 ` Jason Gunthorpe
2019-05-24 16:59 ` Daniel Vetter
2019-05-25 22:52 ` Andrew Morton
2019-05-25 22:52 ` Andrew Morton
2019-05-27 19:12 ` Jason Gunthorpe
2019-06-06 15:25 ` Jason Gunthorpe
2019-06-06 19:53 ` Stephen Rothwell
2019-06-06 19:53 ` Stephen Rothwell
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