x86_32: clean up play_dead

The removal of the CPU from the various maps was redundant as it already
happened in cpu_disable.

After cleaning this up, cpu_uninit only resets the tlb state, so rename
it and create a noop version for the X86_64 case (so the two play_deads
can be unified later).

Signed-off-by: Alex Nixon <alex.nixon@citrix.com>
Acked-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 13 deletions

diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index e382fe0ccd6..d55eb49584b 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -75,26 +75,17 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
 #ifdef CONFIG_HOTPLUG_CPU
 #include <asm/nmi.h>
 
-static void cpu_exit_clear(void)
+/* We don't actually take CPU down, just spin without interrupts. */
+void native_play_dead(void)
 {
 	int cpu = raw_smp_processor_id();
 
 	idle_task_exit();
 
-	cpu_uninit();
-	irq_ctx_exit(cpu);
+	reset_lazy_tlbstate();
 
-	cpu_clear(cpu, cpu_callout_map);
-	cpu_clear(cpu, cpu_callin_map);
-
-	numa_remove_cpu(cpu);
-}
+	irq_ctx_exit(cpu);
 
-/* We don't actually take CPU down, just spin without interrupts. */
-void native_play_dead(void)
-{
-	/* This must be done before dead CPU ack */
-	cpu_exit_clear();
 	mb();
 	/* Ack it */
 	__get_cpu_var(cpu_state) = CPU_DEAD;