tree 3d0b6f45620f66044400ea14a6af019bf0af67e7
parent 0ce790e7d736cedc563e1fb4e998babf5a4dbc3d
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1301667314 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1301668051 -0700

rcu: create new rcu_access_index() and use in mce

The MCE subsystem needs to sample an RCU-protected index outside of
any protection for that index.  If this was a pointer, we would use
rcu_access_pointer(), but there is no corresponding rcu_access_index().
This commit therefore creates an rcu_access_index() and applies it
to MCE.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Zdenek Kabelac <zkabelac@redhat.com>