Function is_fpu_kern_thread

freebsd/amd64/amd64/fpu.c:1262–1269

}

int
is_fpu_kern_thread(u_int flags)
{

	if ((curthread->td_pflags & TDP_KTHREAD) == 0)
		return (0);
	return ((curpcb->pcb_flags & PCB_KERNFPU_THR) != 0);
}

/*
 * FPU save area alloc/free/init utility routines