Make a note stating that repeated calls of rcu_dereference() may not
return the same pointer if update happens while in critical section.
Reported-by: NJeff Haran <jeff.haran@citrix.com>
Signed-off-by: NMilos Vyletel <milos@redhat.com>
Reviewed-by: NSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>