On 01/29/2015 04:49 PM, Oleg Nesterov wrote: > Yes. But in this case tsk != current, and we ensure that __switch_to() > was finished. wait_task_inactive(). > >> When we switch to the traced task, the __thread_fpu_end() >> that was called from init_fpu() ensures that >> switch_fpu_begin() will actually load the new FPU state >> from memory into the registers, and we will not take >> the fpu_lazy_restore() branch. > > No. in this case we rely on "tsk->thread.fpu.last_cpu = ~0" which disables > fpu_lazy_restore().
I should have known that. Especially considering I have a patch here that converts "tsk->thread.fpu.last_cpu = ~0" into a disable_lazy_restore() call... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
