Cedric Le Goater wrote:
>> +int cr_read_cpu_fpu(struct cr_hdr_cpu *hh, struct task_struct *t)
>> +{
>> + struct thread_struct *thread = &t->thread;
>> +
>> + /* i387 + MMU + SSE */
>> +
>> + preempt_disable();
>> +
>> + __clear_fpu(t); /* in case we used FPU in user mode */
>> +
>> + if (!hh->used_math)
>> + clear_used_math();
>> + else {
>> + if (hh->has_fxsr != cpu_has_fxsr) {
>> + force_sig(SIGFPE, t);
>> + return -EINVAL;
>> + }
>
> don't you need an init_fpu() around here ? because the task you restart might
> not have used FPU yet.
>
>> + memcpy(&thread->xstate, &hh->xstate, sizeof(thread->xstate));
>
> also i'd used 'xstate_size' instead of sizeof(thread->xstate)
>
Yes, that was broken, and already fixed in for next round.
Thanks,
Oren.
>
> thanks,
>
> C.
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