From: Shaohua Li <shaohua.li@intel.com>
Date: Mon, 17 Jan 2011 02:52:10 +0000 (+0800)
Subject: x86: Avoid tlbstate lock if not enough cpus
X-Git-Tag: v2.6.39-rc1~499^2~58
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7064d865af804b9b841e7b9a3e9b653e40c3e5ca;p=pandora-kernel.git

x86: Avoid tlbstate lock if not enough cpus

This one isn't related to previous patch. If online cpus are
below NUM_INVALIDATE_TLB_VECTORS, we don't need the lock. The
comments in the code declares we don't need the check, but a hot
lock still needs an atomic operation and expensive, so add the
check here.

Uses nr_cpu_ids here as suggested by Eric Dumazet.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
LKML-Reference: <1295232730.1949.710.camel@sli10-conroe>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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