Re: math_state_restore() question

[Hirokazu Takahashi <taka@valinux.co.jp>]

Hi,

Just take a look at __switch_to(), where __unlazy_fpu() is called.

> Hi,
> 
> I have a quick question.
> 
> The math_state_restore() restores the FPU/MMX/XMM states.
> However where do we save the previous task's states if it is necessary?
> 
> asmlinkage void math_state_restore(struct pt_regs regs)
> {
>         struct thread_info *thread = current_thread_info();
>         struct task_struct *tsk = thread->task;
> 
>         clts();         /* Allow maths ops (or we recurse) */
>         if (!tsk_used_math(tsk))
>                 init_fpu(tsk);
>         restore_fpu(tsk);
>         thread->status |= TS_USEDFPU;   /* So we fnsave on switch_to() */
> }
> 
> Thanks in advance,
>   Hiro
> -- 
> Hiro Yoshioka
> mailto:hyoshiok at miraclelinux.com
> -


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