From 5686b06cea34e31ec0a549d9b5ac00776e8e8d6d Mon Sep 17 00:00:00 2001
From: Will Deacon <will.deacon@arm.com>
Date: Wed, 9 Oct 2013 15:54:27 +0100
Subject: [PATCH] arm64: lockref: add support for lockless lockrefs using
 cmpxchg

Our spinlocks are only 32-bit (2x16-bit tickets) and our cmpxchg can
deal with 8-bytes (as one would hope!).

This patch wires up the cmpxchg-based lockless lockref implementation
for arm64.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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