[PATCH 3/9] x86/i387.c: Thread xstate is initialized only on BSP once

["Fenghua Yu" <fenghua.yu@intel.com>]

From: Fenghua Yu <fenghua.yu@intel.com>

init_thread_xstate() is only called on BSP once to avoid to override
xstate_size.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
 arch/x86/kernel/i387.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index 739d859..f721a61 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -93,6 +93,7 @@ void __cpuinit fpu_init(void)
 {
 	unsigned long cr0;
 	unsigned long cr4_mask = 0;
+	static int once = 1;
 
 	if (cpu_has_fxsr)
 		cr4_mask |= X86_CR4_OSFXSR;
@@ -107,8 +108,14 @@ void __cpuinit fpu_init(void)
 		cr0 |= X86_CR0_EM;
 	write_cr0(cr0);
 
-	if (!smp_processor_id())
+	/*
+	 * init_thread_xstate is only called on BSP once to avoid to override
+	 * xstate_size.
+	 */
+	if (!smp_processor_id() && once) {
+		once = 0;
 		init_thread_xstate();
+	}
 
 	mxcsr_feature_mask_init();
 	/* clean state in init */
-- 
1.6.0.3