From 627ae54854edfbf29d5997015c190de22eef497f Mon Sep 17 00:00:00 2001
From: Chris Metcalf <cmetcalf@ezchip.com>
Date: Tue, 28 Apr 2015 13:00:42 -0400
Subject: [PATCH] tile: use READ_ONCE() in arch_spin_is_locked()

This avoid potential issues if callers were to loop on these
routines without some kind of memory barrier.  Currently there
are no such users in-tree, but it seems better safe than sorry.

Also, in the tilepro case we read "current" before "next",
which gives us a slightly better guarantee that the lock was
actually unlocked at least momentarily if we return claiming
that it is not locked.  None of the callers actually rely on
this behavior, as far as I know, however.

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