From: David S. Miller <davem@davemloft.net>
Date: Sun, 28 Oct 2012 06:00:41 +0000 (-0700)
Subject: sparc64: Use pause instruction when available.
X-Git-Tag: v3.7-rc5~2^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e9b9eb59ffcdee09ec96b040f85c919618f4043e;p=pandora-kernel.git

sparc64: Use pause instruction when available.

In atomic backoff and cpu_relax(), use the pause instruction
found on SPARC-T4 and later.

It makes the cpu strand unselectable for the given number of
cycles, unless an intervening disrupting trap occurs.

Signed-off-by: David S. Miller <davem@davemloft.net>
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