[PATCH -tip v2 0/6] locking: Various updates

[Davidlohr Bueso]

Hello,

A little bit of everything really, with the last two patches being
the most interesting ones.

Patches 1-3 cleanup a bit of ww mutex code.
Patch 4 isolates osq code.
Patch 5 uses the brand new READ/ASSIGN_ONCE primitives.
Patch 6 is a performance patch and gets rid of barrier calls when
        polling for the (osq) lock.

More details obviously in the individual patches. Applies on today's -tip.

Please consider for 3.20, thanks!

Changes since v1 (https://lkml.org/lkml/2014/12/28/22):
o drop patch 1 (pickd up by paulmck)
o drop patch 2 (no can do, thanks a lot gcc)
o improve changelogs.

Davidlohr Bueso (6):
  locking/mutex: Checking the stamp is ww only
  locking/mutex: Move mcs related comments to proper location
  locking/mutex: Introduce ww_mutex_set_context_slowpath
  locking/mcs: Better differentiate between mcs variants
  locking: Use [READ,ASSIGN]_ONCE() for non-scalar types
  locking/osq: No need for load/acquire when acquire-polling

 include/linux/osq_lock.h      |  12 ++-
 kernel/Kconfig.locks          |   4 +
 kernel/locking/Makefile       |   3 +-
 kernel/locking/mcs_spinlock.c | 208 ------------------------------------------
 kernel/locking/mcs_spinlock.h |  22 +----
 kernel/locking/mutex.c        |  66 +++++++-------
 kernel/locking/osq_lock.c     | 203 +++++++++++++++++++++++++++++++++++++++++
 kernel/locking/rwsem-xadd.c   |   4 +-
 8 files changed, 258 insertions(+), 264 deletions(-)
 delete mode 100644 kernel/locking/mcs_spinlock.c
 create mode 100644 kernel/locking/osq_lock.c

-- 
2.1.2

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