From: Suresh Siddha <suresh.b.siddha@intel.com>
Date: Tue, 4 Nov 2008 21:53:04 +0000 (-0800)
Subject: x86: add smp_mb() before sending INVALIDATE_TLB_VECTOR
X-Git-Tag: v2.6.28-rc4~23^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d6f0f39b7d05e62b347c4352d070e4afb3ade4b5;p=pandora-kernel.git

x86: add smp_mb() before sending INVALIDATE_TLB_VECTOR

Impact: fix rare x2apic hang

On x86, x2apic mode accesses for sending IPI's don't have serializing
semantics. If the IPI receivner refers(in lock-free fashion) to some
memory setup by the sender, the need for smp_mb() before sending the
IPI becomes critical in x2apic mode.

Add the smp_mb() in native_flush_tlb_others() before sending the IPI.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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