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Message-Id: <1495749601-21574-47-git-send-email-paulmck@linux.vnet.ibm.com>
Date: Thu, 25 May 2017 14:59:20 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 47/88] rcu: Flag need for rcu_node_tree.h and rcu_segcblist.h visibility
The rcu_node_tree.h and rcu_segcblist.h header files in the include/linux
directory might appear at first sight to be internal to the RCU
implementation. However, the definitions in these files are needed to
determine the size of TREE SRCU's srcu_struct structure, so they must
be externally visible, which is why they live in include/linux.
This commit adds comments to this effect to those files.
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
include/linux/rcu_node_tree.h | 4 ++++
include/linux/rcu_segcblist.h | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/include/linux/rcu_node_tree.h b/include/linux/rcu_node_tree.h
index 4b766b61e1a0..426cee67f0e2 100644
--- a/include/linux/rcu_node_tree.h
+++ b/include/linux/rcu_node_tree.h
@@ -7,6 +7,10 @@
* unlimited scalability while maintaining a constant level of contention
* on the root node.
*
+ * This seemingly RCU-private file must be available to SRCU users
+ * because the size of the TREE SRCU srcu_struct structure depends
+ * on these definitions.
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
diff --git a/include/linux/rcu_segcblist.h b/include/linux/rcu_segcblist.h
index ba4d2621d9ca..c3ad00e63556 100644
--- a/include/linux/rcu_segcblist.h
+++ b/include/linux/rcu_segcblist.h
@@ -1,6 +1,10 @@
/*
* RCU segmented callback lists
*
+ * This seemingly RCU-private file must be available to SRCU users
+ * because the size of the TREE SRCU srcu_struct structure depends
+ * on these definitions.
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
--
2.5.2
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