tree 79399095abe3f6c9b272a0f93d39d22abb5f6603
parent 65edd0e758b8a215825fb3ee685c8eaf6a9cc0d0
author Ilya Lesokhin <ilyal@mellanox.com> 1520947128 +0200
committer Doug Ledford <dledford@redhat.com> 1521057916 -0400

IB/mlx5: Maintain a single emergency page

The mlx5 driver needs to be able to issue invalidation to ODP MRs
even if it cannot allocate memory. To this end it preallocates
emergency pages to use when the situation arises.

This flow should be extremely rare enough, that we don't need
to worry about contention and therefore a single emergency page
is good enough.

Signed-off-by: Ilya Lesokhin <ilyal@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>