On Wed, 19 Jan 2005 20:48:37 +0100
Krzysztof Helt <[EMAIL PROTECTED]> wrote:
> How should it be done? Should copy_flags() during do_fork() preserve
> FPU context/registers for child task? Should SMP and UP context
> switching be handled differently?
copy_thread(), via do_fork(), copies the FPU state in this code here:
#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
}
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