linux-kernel - [PATCH v2] rcu: define tracepoint strings only if CONFIG

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Date:	Fri, 11 Jul 2014 22:50:45 +0200
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	Ard Biesheuvel <ard.biesheuvel@...aro.org>, rostedt@...dmis.org,
	paulmck@...ux.vnet.ibm.com
Subject: [PATCH v2] rcu: define tracepoint strings only if CONFIG_TRACING is set

Commit f7f7bac9cb1c ("rcu: Have the RCU tracepoints use the tracepoint_string
infrastructure") unconditionally populates the __tracepoint_str input section,
but this section is not assigned an output section if CONFIG_TRACING is not set.
This results in the __tracepoint_str turning up in unexpected places, i.e.,
after _edata.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: rostedt@...dmis.org
Cc: paulmck@...ux.vnet.ibm.com
---
v2:
- s/DEFINE_TPS/DEFINE_RCU_TPS/

 kernel/rcu/tree.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index f1ba77363fbb..eec9f3d6f506 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -79,9 +79,16 @@ static struct lock_class_key rcu_fqs_class[RCU_NUM_LVLS];
  * the tracing userspace tools to be able to decipher the string
  * address to the matching string.
  */
+#ifdef CONFIG_TRACING
+#define DEFINE_RCU_TPS(sname) \
+static const char *tp_##sname##_varname __used __tracepoint_string = sname##_varname;
+#else
+#define DEFINE_RCU_TPS(sname)
+#endif
+
 #define RCU_STATE_INITIALIZER(sname, sabbr, cr) \
 static char sname##_varname[] = #sname; \
-static const char *tp_##sname##_varname __used __tracepoint_string = sname##_varname; \
+DEFINE_RCU_TPS(sname) \
 struct rcu_state sname##_state = { \
 	.level = { &sname##_state.node[0] }, \
 	.call = cr, \
-- 
1.8.3.2

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