Thanks for the quick reply.

On Wed, Mar 28, 2018 at 6:19 AM, Richard Weinberger <richard@nod.at> wrote:
> Am Mittwoch, 28. März 2018, 15:11:29 CEST schrieb Geert Uytterhoeven:
>> On Wed, Mar 28, 2018 at 12:28 PM, Joel Fernandes <agnel.joel@gmail.com>
> wrote:
>> >         while(release_now == 0);
>>
>> while (release_now == 0)
>>         cpu_relax();
>
> Not sure whether a cpu_relax() fixes the problem.
> I guess the root of the problem is that UML is UP and non-preemptive.
> Therefore the loop is never interrupted.
> To verify I asked for the full source.
>

cpu_relax actually worked!

Any thoughts on why it helps? Even if its non-preemptive, I did
receive the timer interrupt, so I expected the variable to be set.

Module is attached.

Thanks,
-Joel