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x86/i387.c: Initialize thread xstate only on CPU0 only once

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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>
Link: http://lkml.kernel.org/r/1352835171-3958-14-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Fenghua Yu 2012-11-13 11:32:50 -08:00 committed by H. Peter Anvin
parent 8d966a0410
commit 6f5298c213
1 changed files with 5 additions and 1 deletions
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6
arch/x86/kernel/i387.c
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@ -175,7 +175,11 @@ void __cpuinit fpu_init(void)
cr0 |= X86_CR0_EM; cr0 |= X86_CR0_EM;
write_cr0(cr0); 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(); init_thread_xstate();
mxcsr_feature_mask_init(); mxcsr_feature_mask_init();