From: Chris Metcalf <cmetcalf@tilera.com>
Date: Mon, 16 May 2011 17:59:39 +0000 (-0400)
Subject: arch/tile: use better definitions of xchg() and cmpxchg()
X-Git-Tag: v3.0-rc1~152^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8aaf1dda42576b0f8dffb004065baa806f4df9b6;p=pandora-kernel.git

arch/tile: use better definitions of xchg() and cmpxchg()

These definitions use a ({}) construct to avoid some cases where
we were getting warnings about unused return values.  We also
promote the definition to the common <asm/atomic.h>, since it applies
to both the 32- and 64-bit atomics.

In addition, define __HAVE_ARCH_CMPXCHG for TILE-Gx since it has
efficient direct atomic instructions.

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