linux-stable.git/arch/arc/include/asm/atomic.h, branch linux-3.16.y

ARC: unbork !LLSC build

2016-06-15T20:29:35+00:00

commit daaf40e53b5dbdf75255d58a45ce8ac65ca511a8 upstream.

Fixes: f7d11e93ee97a locking,arch,arc: Fold atomic_ops
Signed-off-by: Vineet Gupta 
Signed-off-by: Ben Hutchings 
Cc: Guenter Roeck

ARC: add smp barriers around atomics per Documentation/atomic_ops.txt

2015-07-15T09:00:53+00:00

commit 2576c28e3f623ed401db7e6197241865328620ef upstream.

 - arch_spin_lock/unlock were lacking the ACQUIRE/RELEASE barriers
   Since ARCv2 only provides load/load, store/store and all/all, we need
   the full barrier

 - LLOCK/SCOND based atomics, bitops, cmpxchg, which return modified
   values were lacking the explicit smp barriers.

 - Non LLOCK/SCOND varaints don't need the explicit barriers since that
   is implicity provided by the spin locks used to implement the
   critical section (the spin lock barriers in turn are also fixed in
   this commit as explained above

Cc: Paul E. McKenney 
Acked-by: Peter Zijlstra (Intel) 
Signed-off-by: Vineet Gupta 
Signed-off-by: Luis Henriques

locking,arch,arc: Fold atomic_ops

2015-07-15T09:00:53+00:00

commit f7d11e93ee97a37da1947b7c4e1794705a6f360c upstream.

Many of the atomic op implementations are the same except for one
instruction; fold the lot into a few CPP macros and reduce LoC.

This also prepares for easy addition of new ops.

Signed-off-by: Peter Zijlstra 
Cc: Linus Torvalds 
Cc: Paul E. McKenney 
Cc: Vineet Gupta 
Link: http://lkml.kernel.org/r/20140508135851.886055622@infradead.org
Signed-off-by: Ingo Molnar 
[ luis: 3.16 prereq for:
  2576c28e3f62 "ARC: add smp barriers around atomics per Documentation/atomic_ops.txt"
Signed-off-by: Luis Henriques

arch,arc: Convert smp_mb__*()

2014-04-18T09:40:31+00:00

The arc mb() implementation is a compiler barrier(), therefore it all
doesn't matter one way or the other. Simply remove the existing
definitions and use whatever is generated by the defaults.

Signed-off-by: Peter Zijlstra 
Acked-by: Paul E. McKenney 
Link: http://lkml.kernel.org/n/tip-ua48a59wri3ybz1rz8i7uvbr@git.kernel.org
Cc: Linus Torvalds 
Cc: Vineet Gupta 
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

arch: Move smp_mb__{before,after}_atomic_{inc,dec}.h into asm/atomic.h

2014-01-12T09:37:14+00:00

Move the barriers functions that depend on the atomic implementation
into the atomic implementation.

Reviewed-by: Paul E. McKenney 
Signed-off-by: Peter Zijlstra 
Acked-by: Vineet Gupta  [for arch/arc bits]
Cc: Peter Zijlstra 
Cc: Linus Torvalds 
Cc: Andrew Morton 
Cc: Thomas Gleixner 
Cc: Paul E. McKenney 
Link: http://lkml.kernel.org/r/20131213150640.786183683@infradead.org
Signed-off-by: Ingo Molnar

ARC: Atomic/bitops/cmpxchg/barriers

2013-02-11T14:30:30+00:00

This covers the UP / SMP (with no hardware assist for atomic r-m-w) as
well as ARC700 LLOCK/SCOND insns based.

Signed-off-by: Vineet Gupta