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    SubjectRe: [PATCH v3 6/7] x86/i387.c: Thread xstate is initialized only on BSP once
    On Wed, Nov 09, 2011 at 04:34:16PM -0800, Fenghua Yu wrote:
    > 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

    "to avoid overriding xstate_size"

    > + * 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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