From: Dimitri Sivanich <sivanich@sgi.com>
Date: Tue, 28 Dec 2010 19:34:42 +0000 (-0600)
Subject: [IA64] eliminate race condition in smp_flush_tlb_mm
X-Git-Tag: v2.6.38-rc1~426^2^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75c1c91cb92806f960fcd6e53d2a0c21f343081c;p=pandora-kernel.git

[IA64] eliminate race condition in smp_flush_tlb_mm

A race condition exists within smp_call_function_many() when called from
smp_flush_tlb_mm().  On rare occasions the cpu_vm_mask can be cleared
while smp_call_function_many is executing, occasionally resulting in a
hung process.

Make a copy of the mask prior to calling smp_call_function_many().

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