Question about RCU

[Jonathan Neuschäfer]

On Sat, Dec 17, 2011 at 07:15:30PM -0500, contemplating zombie wrote:
> Hi,
> 
> I understand that multiple readers have to use rcu_read_lock(void) and
> rcu_read_unlock(void) to read data protected by rcu. However, I do not
> understand how the kernel distinguishes between multiple rcu protected
> regions.

It doesn't.
Have you read Documentation/RCU/whatisRCU.txt?

Thanks,
Jonathan Neuschäfer