rcu: Make __call_srcu static

Because __call_srcu() is not used outside kernel/rcu/srcutree.c,
this commit makes it static.

Signed-off-by: Jiang Biao <benbjiang@tencent.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Jiang Biao 2019-04-23 09:22:56 +08:00 • committed by Paul E. McKenney
commit 11b000457f