From mboxrd@z Thu Jan  1 00:00:00 1970
From: j.neuschaefer@gmx.net (Jonathan =?utf-8?Q?Neusch=C3=A4fer?=)
Date: Wed, 21 Dec 2011 19:51:06 +0100
Subject: Question about RCU
In-Reply-To: <CAO_gTC5ZGVoyMATX+ZSSHUpi9_knQ6xKdBDa94p7fwv2JrRcgA@mail.gmail.com>
References: <CAO_gTC5ZGVoyMATX+ZSSHUpi9_knQ6xKdBDa94p7fwv2JrRcgA@mail.gmail.com>
Message-ID: <20111221185106.GA1513@debian.debian>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

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 Neusch?fer