From: Dimitri Sivanich <sivanich@sgi.com>
Date: Wed, 15 Apr 2009 15:56:25 +0000 (-0500)
Subject: [IA64] smp_flush_tlb_mm() should only send IPI's to cpus in cpu_vm_mask
X-Git-Tag: v2.6.30-rc3~38^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=edb91dc01a216e84b78721b71a06db1e0db141b7;p=pandora-kernel.git

[IA64] smp_flush_tlb_mm() should only send IPI's to cpus in cpu_vm_mask

Having flush_tlb_mm->smp_flush_tlb_mm() send an IPI to every cpu
on the system is occasionally triggering spin_lock contention in
generic_smp_call_function_interrupt().

Follow x86 arch's lead and only sends IPIs to the cpus in mm->cpu_vm_mask.

Experiments with this change have shown significant improvement in this
contention issue.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
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