[SPARC64]: Fix bugs in SMP TLB context version expiration handling.

1) We must flush the TLB, duh.

2) Even if the sw context was seen to be valid, the local cpu's
   hw context can be out of date, so reload it unconditionally.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 6 deletions

diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 5ff2483e70b..eb7c0f855ba 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -909,14 +909,18 @@ void smp_receive_signal_client(int irq, struct pt_regs *regs)
 	 */
 	mm = current->active_mm;
 	if (likely(mm)) {
-		if (unlikely(!CTX_VALID(mm->context))) {
-			unsigned long flags;
+		unsigned long flags;
 
-			spin_lock_irqsave(&mm->context.lock, flags);
+		spin_lock_irqsave(&mm->context.lock, flags);
+
+		if (unlikely(!CTX_VALID(mm->context)))
 			get_new_mmu_context(mm);
-			load_secondary_context(mm);
-			spin_unlock_irqrestore(&mm->context.lock, flags);
-		}
+
+		load_secondary_context(mm);
+		__flush_tlb_mm(CTX_HWBITS(mm->context),
+			       SECONDARY_CONTEXT);
+
+		spin_unlock_irqrestore(&mm->context.lock, flags);
 	}
 }