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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2014-07-12 13:01:49 -0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-09-07 19:18:14 -0400
commita8a29b3b7b18251c4e3ffce501f25ae868302a75 (patch)
treec1a38c47ae43dc8f89e17d32a3c19434470cd78e /kernel
parent85b39d305bfe809a11ff2770d380be3e2465beec (diff)
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@linaro.org> Reviewed-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/rcu/tree.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 2719978ea018..dc52dc3b8c3e 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -79,9 +79,18 @@ static struct lock_class_key rcu_fqs_class[RCU_NUM_LVLS];
79 * the tracing userspace tools to be able to decipher the string 79 * the tracing userspace tools to be able to decipher the string
80 * address to the matching string. 80 * address to the matching string.
81 */ 81 */
82#define RCU_STATE_INITIALIZER(sname, sabbr, cr) \ 82#ifdef CONFIG_TRACING
83# define DEFINE_RCU_TPS(sname) \
83static char sname##_varname[] = #sname; \ 84static char sname##_varname[] = #sname; \
84static const char *tp_##sname##_varname __used __tracepoint_string = sname##_varname; \ 85static const char *tp_##sname##_varname __used __tracepoint_string = sname##_varname;
86# define RCU_STATE_NAME(sname) sname##_varname
87#else
88# define DEFINE_RCU_TPS(sname)
89# define RCU_STATE_NAME(sname) __stringify(sname)
90#endif
91
92#define RCU_STATE_INITIALIZER(sname, sabbr, cr) \
93DEFINE_RCU_TPS(sname) \
85struct rcu_state sname##_state = { \ 94struct rcu_state sname##_state = { \
86 .level = { &sname##_state.node[0] }, \ 95 .level = { &sname##_state.node[0] }, \
87 .call = cr, \ 96 .call = cr, \
@@ -93,7 +102,7 @@ struct rcu_state sname##_state = { \
93 .orphan_donetail = &sname##_state.orphan_donelist, \ 102 .orphan_donetail = &sname##_state.orphan_donelist, \
94 .barrier_mutex = __MUTEX_INITIALIZER(sname##_state.barrier_mutex), \ 103 .barrier_mutex = __MUTEX_INITIALIZER(sname##_state.barrier_mutex), \
95 .onoff_mutex = __MUTEX_INITIALIZER(sname##_state.onoff_mutex), \ 104 .onoff_mutex = __MUTEX_INITIALIZER(sname##_state.onoff_mutex), \
96 .name = sname##_varname, \ 105 .name = RCU_STATE_NAME(sname), \
97 .abbr = sabbr, \ 106 .abbr = sabbr, \
98}; \ 107}; \
99DEFINE_PER_CPU(struct rcu_data, sname##_data) 108DEFINE_PER_CPU(struct rcu_data, sname##_data)