Comment 5 for bug 1802021

Hi Joshua,

I just reviewed the commit Joseph provided in the launchpad. It's the
same as the two patches I backported.

eb4c2382272a srcu: Lock srcu_data structure in srcu_gp_start()
d633198088bd srcu: Prohibit call_srcu() use under raw spinlocks

The commit id eb4c2382272a is the latest linux-next commit id. When I
backported the above two patches, the eb4c2382272a was in Paul's
rcu-next tree. So, for the SRU process, Joseph's backport are the formal one.