Messages in this thread Patch in this message | | | From | "Fenghua Yu" <> | Subject | [PATCH v4 6/7] x86/i387.c: Thread xstate is initialized only on BSP once | Date | Fri, 11 Nov 2011 21:26:31 -0800 |
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From: Fenghua Yu <fenghua.yu@intel.com>
init_thread_xstate() is only called on BSP once to avoid overriding 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..72652ff 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 overriding + * xstate_size. + */ + if (!smp_processor_id() && once) { + once = 0; init_thread_xstate(); + } mxcsr_feature_mask_init(); /* clean state in init */ -- 1.6.0.3
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