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

[Jason Gunthorpe]

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..

Jason