[PATCH v4 0/2] locking/qrwlock: More optimizations in qrwlock

[Waiman Long]

v3->v4:
 - Remove the unnecessary _QW_WMASK check in
   queue_read_lock_slowpath().

v2->v3:
 - Fix incorrect commit log message in patch 1.

v1->v2:
 - Add microbenchmark data for the second patch

This patch set contains 2 patches on qrwlock. The first one is to
optimize the interrupt context reader slowpath.  The second one is
to optimize the writer slowpath.

Waiman Long (2):
  locking/qrwlock: Better optimization for interrupt context readers
  locking/qrwlock: Don't contend with readers when setting _QW_WAITING

 include/asm-generic/qrwlock.h |    4 ++--
 kernel/locking/qrwlock.c      |   41 +++++++++++++++++++++++++++++++----------
 2 files changed, 33 insertions(+), 12 deletions(-)

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