srcu: Make Classic and Tree SRCU announce themselves at bootup

Currently, the only way to tell whether a given kernel is running
Classic, Tiny, or Tree SRCU is to look at the .config file, which
can easily be lost or associated with the wrong kernel.  This commit
therefore has Classic and Tree SRCU identify themselves at boot time.

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

diff --git a/kernel/rcu/srcu.c b/kernel/rcu/srcu.c
index dea0361..4e3f558 100644 (file)
--- a/kernel/rcu/srcu.c
+++ b/kernel/rcu/srcu.c
@@ -659,3 +659,10 @@ void process_srcu(struct work_struct *work)
        srcu_reschedule(sp);
 }
 EXPORT_SYMBOL_GPL(process_srcu);
+
+static int __init srcu_bootup_announce(void)
+{
+       pr_info("Classic SRCU implementation.\n");
+       return 0;
+}
+early_initcall(srcu_bootup_announce);

diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index fceca84..03d57fe 100644 (file)
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -1167,3 +1167,10 @@ void srcutorture_get_gp_data(enum rcutorture_type test_type,
        *gpnum = rcu_seq_ctr(sp->srcu_gp_seq_needed);
 }
 EXPORT_SYMBOL_GPL(srcutorture_get_gp_data);
+
+static int __init srcu_bootup_announce(void)
+{
+       pr_info("Hierarchical SRCU implementation.\n");
+       return 0;
+}
+early_initcall(srcu_bootup_announce);