fix nsecs_to_jiffies wrapper

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
fix: use irq safe spinlock and protect the HT as well

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
remove warn_on and add a counter

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>