From: Cliff Wickman <cpw@sgi.com>
Date: Thu, 15 Jan 2009 15:51:20 +0000 (-0600)
Subject: x86, UV: cpu_relax in uv_wait_completion
X-Git-Tag: v2.6.29-rc3~42^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=18c07cf530cf4aa8b7551801f68ed40db5ee4e45;p=pandora-kernel.git

x86, UV: cpu_relax in uv_wait_completion

The function uv_wait_completion() spins on reads of a memory-mapped
register, waiting for completion of BAU hardware replies.

It should call "cpu_relax()" between those reads to improve performance
on hyperthreaded configurations.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Acked-by: Jack Steiner <steiner@sgi.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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