SPARC64: Fix __get_cpu_var in preemption-enabled area.

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: David S. Miller <davem@xxxxxxxxxxxxx>

Upstream commit: 69072f6e8e4bd4799d2a54e4ff8771d0657512c1

Reported by Mariusz Kozlowski.

Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 arch/sparc64/mm/tlb.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/sparc64/mm/tlb.c
+++ b/arch/sparc64/mm/tlb.c
@@ -23,10 +23,11 @@ DEFINE_PER_CPU(struct mmu_gather, mmu_ga
 
 void flush_tlb_pending(void)
 {
-	struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
+	struct mmu_gather *mp;
 
 	preempt_disable();
 
+	mp = &__get_cpu_var(mmu_gathers);
 	if (mp->tlb_nr) {
 		flush_tsb_user(mp);
 

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