On Wed, 19 Jan 2005 21:46:40 +0100
Krzysztof Helt <[EMAIL PROTECTED]> wrote:
> >#ifndef CONFIG_SMP
> > if(last_task_used_math == current) {
> >#else
> > if(current_thread_info()->flags & _TIF_USEDFPU) {
> >#endif
> > put_psr(get_psr() | PSR_EF);
> > fpsave(&p->thread.float_regs[0], &p->thread.fsr,
> > &p->thread.fpqueue[0], &p->thread.fpqdepth);
> >#ifdef CONFIG_SMP
> > current_thread_info()->flags &= ~_TIF_USEDFPU;
> >#endif
> > }
> >
> It is not enough or I do not understand something. The new thread will
> have a _TIF_USEDFPU flag disabled (if not cleared here, it is cleared in
> copy_flags() in the do_fork()). So, a FP disabled trap handler will
> initialize FPU state from default values, not from the ones saved here.
> BTW, the new thread is p or current in the copy_thread function? I
> suppose it is current.
No, we are saving the "current" fpu state to the save area of "p" which
is the child thread.
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