[RFC PATCH 5/6] alpha: enable MMU_LAZY_TLB_SHOOTDOWN

[Nicholas Piggin <npiggin@gmail.com>]

With the sticky mm_cpumask, and conversion to mmgrab_lazy_tlb(), alpha
meets the requirements for MMU_LAZY_TLB_SHOOTDOWN. Select it.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/alpha/Kconfig      | 1 +
 arch/alpha/kernel/smp.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index a5c2b1aa46b0..8f9995d66345 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -35,6 +35,7 @@ config ALPHA
 	select OLD_SIGSUSPEND
 	select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
 	select MMU_GATHER_NO_RANGE
+	select MMU_LAZY_TLB_SHOOTDOWN
 	select SPARSEMEM_EXTREME if SPARSEMEM
 	select ZONE_DMA
 	help
diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index d668b9d319af..73bbb81f336e 100644
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -143,7 +143,7 @@ smp_callin(void)
 		alpha_mv.smp_callin();
 
 	/* All kernel threads share the same mm context.  */
-	mmgrab(&init_mm);
+	mmgrab_lazy_tlb(&init_mm);
 	current->active_mm = &init_mm;
 	cpumask_set_cpu(smp_processor_id(), mm_cpumask(&init_mm));
 
-- 
2.40.1