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-rw-r--r--kernel/tracepoint.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index d0639d917899..1f9a31f934a4 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -194,9 +194,13 @@ static int tracepoint_add_func(struct tracepoint *tp,
struct tracepoint_func *func, int prio)
{
struct tracepoint_func *old, *tp_funcs;
+ int ret;
- if (tp->regfunc && !static_key_enabled(&tp->key))
- tp->regfunc();
+ if (tp->regfunc && !static_key_enabled(&tp->key)) {
+ ret = tp->regfunc();
+ if (ret < 0)
+ return ret;
+ }
tp_funcs = rcu_dereference_protected(tp->funcs,
lockdep_is_held(&tracepoints_mutex));
@@ -529,7 +533,7 @@ EXPORT_SYMBOL_GPL(for_each_kernel_tracepoint);
/* NB: reg/unreg are called while guarded with the tracepoints_mutex */
static int sys_tracepoint_refcount;
-void syscall_regfunc(void)
+int syscall_regfunc(void)
{
struct task_struct *p, *t;
@@ -541,6 +545,8 @@ void syscall_regfunc(void)
read_unlock(&tasklist_lock);
}
sys_tracepoint_refcount++;
+
+ return 0;
}
void syscall_unregfunc(void)