From 6eabb3301b1facee669d9938f7c5a0295c21d71d Mon Sep 17 00:00:00 2001
From: Jaccon Bastiaansen <jaccon.bastiaansen@gmail.com>
Date: Mon, 13 May 2013 17:28:27 +0100
Subject: [PATCH] ARM: 7720/1: ARM v6/v7 cmpxchg64 shouldn't clear upper 32
 bits of the old/new value

The implementation of cmpxchg64() for the ARM v6 and v7 architecture
casts parameter 2 and 3 (the old and new 64bit values) to an unsigned
long before calling the atomic_cmpxchg64() function. This clears
the top 32 bits of the old and new values, resulting in the wrong
values being compare-exchanged. Luckily, this only appears to be used
for 64-bit sched_clock, which we don't (yet) have on ARM.

This bug was introduced by commit 3e0f5a15f500 ("ARM: 7404/1: cmpxchg64:
use atomic64 and local64 routines for cmpxchg64").

Cc: <stable@vger.kernel.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jaccon Bastiaansen <jaccon.bastiaansen@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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