[PATCH v3 0/4] locking/rwsem: Add reader-owned state to the owner field

[Waiman Long]

 v2->v3:
  - Make minor code changes as suggested by PeterZ & Peter Hurley.
  - Add 2 minor patches (#2 & #3) to improve the rwsem code
  - Add a 4th patch to streamline the rwsem_optimistic_spin() code.

 v1->v2:
  - Add rwsem_is_reader_owned() helper & rename rwsem_reader_owned()
    to rwsem_set_reader_owned().
  - Add more comments to clarify the purpose of some of the code
    changes.

Patch 1 is the main patch of this series, whereas patches 2 & 3 are
just minor patches to improve the efficiency of the rwsem code. Patch
4 streamlines the rwsem_optimistic_spin() to make it simpler.

Waiman Long (4):
  locking/rwsem: Add reader-owned state to the owner field
  locking/rwsem: Don't wake up one's own task
  locking/rwsem: Improve reader wakeup code
  locking/rwsem: Streamline the rwsem_optimistic_spin() code

 kernel/locking/rwsem-xadd.c |   75 ++++++++++++++++++++++++------------------
 kernel/locking/rwsem.c      |    8 +++-
 kernel/locking/rwsem.h      |   41 +++++++++++++++++++++++
 3 files changed, 90 insertions(+), 34 deletions(-)