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arch: Introduce smp_load_acquire() and smp_store_release()

From:  Peter Zijlstra <peterz@infradead.org>
To:  linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org
Subject:  [PATCH 0/4] arch: Introduce smp_load_acquire() and smp_store_release()
Date:  Wed, 18 Dec 2013 20:08:06 +0100
Message-ID:  <20131218190806.370008594@infradead.org>
Cc:  geert@linux-m68k.org, paulmck@linux.vnet.ibm.com, torvalds@linux-foundation.org, VICTORK@il.ibm.com, oleg@redhat.com, anton@samba.org, benh@kernel.crashing.org, fweisbec@gmail.com, mathieu.desnoyers@polymtl.ca, michael@ellerman.id.au, mikey@neuling.org, linux@arm.linux.org.uk, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, tony.luck@intel.com, Peter Zijlstra <peterz@infradead.org>
Archive-link:  Article


This should hopefully be the last posting of this series -- people felt it
needed one more mostly because last time I typoed the linux-kernel email
address.

If there are no further comments, Ingo will merge these patches in the next few
days.

---

These patches introduce 2 new barrier primitives:

  smp_load_acquire(p)
  smp_store_release(p, v)

See the first patch, which changes Documentation/memory-barriers.txt, to find
the exact definitions of what an ACQUIRE/RELEASE barrier is -- previously known
as LOCK/UNLOCK barriers.

The second patch moves the smp_mb__{before,after}_atomic_{dec,inc}() barriers
to asm/atomic.h for arc and hexagon -- they were already there for all other archs.

This cleans up asm/barrier.h, and the third patch makes more agressive use of
asm-generic/barrier.h to implement the simple cases.

Then the fourth patch adds the new primitives.

Previous versions were widely build tested -- this version is not, but it also
not significantly different.

These patches apply to:

  tip/master


---
Changes since the last version -- lkml.kernel.org/r/20131213145657.265414969@infradead.org

 - fixed linux-kernel email address
 - updated the Documentation patch

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