rcu: Change EXPORT_SYMBOL() to EXPORT_SYMBOL_GPL()

Commit e6b80a3b (rcu: Detect illegal rcu dereference in extended
quiescent state) exported the pre-existing rcu_is_cpu_idle() function
using EXPORT_SYMBOL().  However, this is inconsistent with the remaining
exports from RCU, which are all EXPORT_SYMBOL_GPL().  The current state
of affairs means that a non-GPL module could use rcu_is_cpu_idle(),
but in a CONFIG_TREE_PREEMPT_RCU=y kernel would be unable to invoke
rcu_read_lock() and rcu_read_unlock().

This commit therefore makes rcu_is_cpu_idle()'s export be consistent
with the rest of RCU, namely EXPORT_SYMBOL_GPL().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 910d868808dc..1b123e179d71 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -669,7 +669,7 @@ int rcu_is_cpu_idle(void)
         preempt_enable();
         return ret;
 }
-EXPORT_SYMBOL(rcu_is_cpu_idle);
+EXPORT_SYMBOL_GPL(rcu_is_cpu_idle);
 
 /**
  * __rcu_is_watching - are RCU read-side critical sections safe?