tree 86516900c0d756d1694e4d2f96777304920628df
parent 768beaf393c3259be52e55bf53c80face1b5ce79
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1441093377 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1441093732 -0700

rcu: Move preemption disabling out of __srcu_read_lock()

Currently, __srcu_read_lock() cannot be invoked from restricted
environments because it contains calls to preempt_disable() and
preempt_enable(), both of which can invoke lockdep, which is a bad
idea in some restricted execution modes.  This commit therefore moves
the preempt_disable() and preempt_enable() from __srcu_read_lock()
to srcu_read_lock().  It also inserts the preempt_disable() and
preempt_enable() around the call to __srcu_read_lock() in do_exit().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>