linux-kernel - Re: [PATCH v4 0/1] Use HMM for ODP v4

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Date:   Thu, 23 May 2019 23:40:51 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Jerome Glisse <jglisse@...hat.com>, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, Leon Romanovsky <leonro@...lanox.com>,
        Doug Ledford <dledford@...hat.com>,
        Artemy Kovalyov <artemyko@...lanox.com>,
        Moni Shoua <monis@...lanox.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Kaike Wan <kaike.wan@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        linux-mm@...ck.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v4 0/1] Use HMM for ODP v4

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.
> 
> If you cannot take the read mmap sem (why not?), then please use my
> version and push the update to the driver through -mm..

I think it would really help if we queue up these changes in a git tree
that can be pulled into the driver trees.  Given that you've been
doing so much work to actually make it usable I'd nominate rdma for the
"lead" tree.