nvmap: page pool: fix background thread

Fix a race condition in the background allocator where
wake_up_process could be called just before set_current_state
changed the state to TASK_INTERRUPTIBLE, causing the thread
not to wake.  Use a waitqueue instead.

Also make the background allocator nicer by marking it freezable
so it doesn't compete with suspend, and setting it SCHED_IDLE so
it only runs when no other threads want to run.

Change-Id: If95da005bb1fc4c9b5e802d40730803a57057fe1
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-on: http://git-master/r/664673
GVS: Gerrit_Virtual_Submit
Reviewed-on: http://git-master/r/736427
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Tested-by: Alex Waterman <alexw@nvidia.com>

0 files changed, 0 insertions, 0 deletions