[PATCH] cpu state clean after hot remove

Clean CPU states in order to reuse smp boot code for CPU hotplug.

Signed-off-by: Li Shaohua<shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/i386/kernel/cpu/common.c b/arch/i386/kernel/cpu/common.c
index aac74758caf4..2203a9d20212 100644
--- a/arch/i386/kernel/cpu/common.c
+++ b/arch/i386/kernel/cpu/common.c
@@ -651,3 +651,15 @@ void __devinit cpu_init(void)
         clear_used_math();
         mxcsr_feature_mask_init();
 }
+
+#ifdef CONFIG_HOTPLUG_CPU
+void __devinit cpu_uninit(void)
+{
+        int cpu = raw_smp_processor_id();
+        cpu_clear(cpu, cpu_initialized);
+
+        /* lazy TLB state */
+        per_cpu(cpu_tlbstate, cpu).state = 0;
+        per_cpu(cpu_tlbstate, cpu).active_mm = &init_mm;
+}
+#endif