From adf6d9b30f089c52e674e84ca2960581e504e5e3 Mon Sep 17 00:00:00 2001
From: Chris Metcalf <cmetcalf@tilera.com>
Date: Fri, 1 Feb 2013 12:37:48 -0500
Subject: [PATCH] tile: support atomic64_dec_if_positive()

Use the normal cmpxchg() idiom to implement this functionality.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
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