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rcu: Move preemption disabling out of __srcu_read_lock()

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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>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2015-09-01 00:42:57 -07:00
parent 7f21aeef72
commit 49f5903b47
3 changed files with 6 additions and 3 deletions
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5
include/linux/srcu.h
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@ -215,8 +215,11 @@ static inline int srcu_read_lock_held(struct srcu_struct *sp)
*/
static inline int srcu_read_lock(struct srcu_struct *sp) __acquires(sp)
{
int retval = __srcu_read_lock(sp);
int retval;
preempt_disable();
retval = __srcu_read_lock(sp);
preempt_enable();
rcu_lock_acquire(&(sp)->dep_map);
return retval;
}