MIPS: SMP: Don't reenable interrupts in stop_this_cpu; use WAIT instruction.

Noticed by Anirban Sinha <ASinha@zeugmasystems.com>; patch by me.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 7b59cfb7e602..b79ea7055ec3 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -163,8 +163,10 @@ static void stop_this_cpu(void *dummy)
          * Remove this CPU:
          */
         cpu_clear(smp_processor_id(), cpu_online_map);
-        local_irq_enable();     /* May need to service _machine_restart IPI */
-        for (;;);               /* Wait if available. */
+        for (;;) {
+                if (cpu_wait)
+                        (*cpu_wait)();          /* Wait if available. */
+        }
 }
 
 void smp_send_stop(void)