Invoke eventfd_signal within ISR with IRQF_NO_THREAD set

Invoke eventfd_signal within ISR with IRQF_NO_THREAD set

[liron atedgi]

Hi All,

I've an interrupt handler which registered with IRQF_NO_THREAD flag.
As part on the ISR, I would like to invoke eventfd_signal
(fs/eventfd.c:eventfd_signal) in order to wakeup some user thread
which "sits" on this event.

Since the ISR marked as NO_THREAD (which is what i need), the ISR will
be called within interrupt context, however, it seems that the
eventfd_signal function uses a spinlock which is not raw, hence, with
RT patch it is converted to rt_spin_lock which is actually a mutex and
hence, it's not an appropriate locking mechanism to be used in
interrupt,

I'll be glad for any help.

Appreciate your reply.

Regards,
Liron