From 1f4f6da1c80905830337c3ff46a2d3260dabb864 Mon Sep 17 00:00:00 2001
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Date: Fri, 21 Apr 2017 11:16:32 -0700
Subject: [PATCH] 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>
---
kernel/rcu/srcu.c | 7 +++++++
kernel/rcu/srcutree.c | 7 +++++++
2 files changed, 14 insertions(+)
diff --git a/kernel/rcu/srcu.c b/kernel/rcu/srcu.c
index dea03614263fd..4e3f558409a02 100644
--- 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 fceca84df6b05..03d57fe9f0949 100644
--- 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);
--
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