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Subject[PATCH 0/5] locking: Adopt relaxed barrier semantics
Date
Hi,

This series continues porting users to Will's new _{acquire|release|relaxed}
optimizations for weakly ordered archs -- and in practice, arm64 being the only
actual user we have, thus could use a _lot_ more testing. While we have osq in
-tip recently, along with Waiman's one for native qspinlock, the following
patches pretty much complete the move over for all things kernel/locking/*.
Of course, particular primitives can be found in the obvious patch titles. Note
that patch 1 adds the necessary machinery to fully support some locks, such as
rwsems.

Compiles on x86 and x86-64.

Thanks!

Davidlohr Bueso (5):
asm-generic: Add _{relaxed|acquire|release}() variants for inc/dec
atomics
locking/mutex: Relax to atomic/release semantics
locking/rtmutex: Relax to acquire/release semantics
locking/rwsem: Relax to acquire/release semantics
locking/mcs: Relax to atomic/release semantics

include/asm-generic/atomic-long.h | 29 +++++++-----
include/asm-generic/mutex-dec.h | 8 ++--
include/asm-generic/mutex-xchg.h | 10 ++--
include/asm-generic/rwsem.h | 14 +++---
include/linux/atomic.h | 97 +++++++++++++++++++++++++++++++++++++++
kernel/locking/mcs_spinlock.h | 4 +-
kernel/locking/mutex.c | 9 ++--
kernel/locking/rtmutex.c | 30 ++++++++----
kernel/locking/rwsem-xadd.c | 5 +-
9 files changed, 161 insertions(+), 45 deletions(-)

--
2.1.4



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