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Subject[PATCH v5 11/12] x86/i387.c: Thread xstate is initialized only on CPU0 once
Date
From: Fenghua Yu <fenghua.yu@intel.com>

init_thread_xstate() is only called once to avoid overriding xstate_size during
boot time or during CPU hotplug.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
arch/x86/kernel/i387.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index 739d859..cca99fa 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -107,7 +107,11 @@ void __cpuinit fpu_init(void)
cr0 |= X86_CR0_EM;
write_cr0(cr0);

- if (!smp_processor_id())
+ /*
+ * init_thread_xstate is only called once to avoid overriding
+ * xstate_size during boot time or during CPU hotplug.
+ */
+ if (xstate_size == 0)
init_thread_xstate();

mxcsr_feature_mask_init();
--
1.6.0.3


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