From: David S. Miller <davem@davemloft.net>
Date: Thu, 19 Aug 2010 05:53:26 +0000 (-0700)
Subject: sparc64: Make lock backoff really a NOP on UP builds.
X-Git-Tag: v2.6.36-rc3~36^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f58189d4a3ca96d7959501ecb203177efdbc5bd;p=pandora-kernel.git

sparc64: Make lock backoff really a NOP on UP builds.

As noticed by Mikulas Patocka, the backoff macros don't
completely nop out for UP builds, we still get a
branch always and a delay slot nop.

Fix this by making the branch to the backoff spin loop
selective, then we can nop out the spin loop completely.

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