lkml.org 
[lkml]   [2011]   [Nov]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v4 6/7] x86/i387.c: Thread xstate is initialized only on BSP once
From
On Sat, Nov 12, 2011 at 12:26 AM, Fenghua Yu <fenghua.yu@intel.com> wrote:
> 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();
> +       }

Just check if xstate_size is 0 instead of adding a new flag.

--
Brian Gerst
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2011-11-13 16:19    [from the cache]
©2003-2011 Jasper Spaans