* Dan Williams <dan.j.willi...@intel.com> wrote:
> Kirill points out that the calls to {get,put}_dev_pagemap() can be
> removed from the mm fast path if we take a single get_dev_pagemap()
> reference to signify that the page is alive and use the final put of the
> page to drop that reference.
>
> This does require some care to make sure that any waits for the
> percpu_ref to drop to zero occur *after* devm_memremap_page_release(),
> since it now maintains its own elevated reference.
>
> Cc: Ingo Molnar <mi...@redhat.com>
> Cc: Jérôme Glisse <jgli...@redhat.com>
> Cc: Andrew Morton <a...@linux-foundation.org>
> Reviewed-by: Logan Gunthorpe <log...@deltatee.com>
> Suggested-by: Kirill Shutemov <kirill.shute...@linux.intel.com>
> Tested-by: Kirill Shutemov <kirill.shute...@linux.intel.com>
> Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
This changelog is lacking an explanation about how this solves the crashes you
were seeing.
Thanks,
Ingo
