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-rw-r--r--include/linux/rcupdate.h14
-rw-r--r--kernel/pid.c1
2 files changed, 10 insertions, 5 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index b973dea2d6b..b124bc6a75a 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -215,7 +215,11 @@ static inline int rcu_read_lock_sched_held(void)
extern int rcu_my_thread_group_empty(void);
-#define __do_rcu_dereference_check(c) \
+/**
+ * rcu_lockdep_assert - emit lockdep splat if specified condition not met
+ * @c: condition to check
+ */
+#define rcu_lockdep_assert(c) \
do { \
static bool __warned; \
if (debug_lockdep_rcu_enabled() && !__warned && !(c)) { \
@@ -226,7 +230,7 @@ extern int rcu_my_thread_group_empty(void);
#else /* #ifdef CONFIG_PROVE_RCU */
-#define __do_rcu_dereference_check(c) do { } while (0)
+#define rcu_lockdep_assert(c) do { } while (0)
#endif /* #else #ifdef CONFIG_PROVE_RCU */
@@ -247,14 +251,14 @@ extern int rcu_my_thread_group_empty(void);
#define __rcu_dereference_check(p, c, space) \
({ \
typeof(*p) *_________p1 = (typeof(*p)*__force )ACCESS_ONCE(p); \
- __do_rcu_dereference_check(c); \
+ rcu_lockdep_assert(c); \
(void) (((typeof (*p) space *)p) == p); \
smp_read_barrier_depends(); \
((typeof(*p) __force __kernel *)(_________p1)); \
})
#define __rcu_dereference_protected(p, c, space) \
({ \
- __do_rcu_dereference_check(c); \
+ rcu_lockdep_assert(c); \
(void) (((typeof (*p) space *)p) == p); \
((typeof(*p) __force __kernel *)(p)); \
})
@@ -262,7 +266,7 @@ extern int rcu_my_thread_group_empty(void);
#define __rcu_dereference_index_check(p, c) \
({ \
typeof(p) _________p1 = ACCESS_ONCE(p); \
- __do_rcu_dereference_check(c); \
+ rcu_lockdep_assert(c); \
smp_read_barrier_depends(); \
(_________p1); \
})
diff --git a/kernel/pid.c b/kernel/pid.c
index 0f90c2f713f..39b65b69584 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -416,6 +416,7 @@ EXPORT_SYMBOL(pid_task);
*/
struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns)
{
+ rcu_lockdep_assert(rcu_read_lock_held());
return pid_task(find_pid_ns(nr, ns), PIDTYPE_PID);
}