tracing: Add rcu dereference annotation for filter->prog

ftrace_function_set_filter() referenences filter->prog without annotation
and sparse complains about it. It needs a rcu_dereference_protected()
wrapper.
Reported-by: default avatarkbuild test robot <fengguang.wu@intel.com>
Fixes: 80765597 ("tracing: Rewrite filter logic to be simpler and faster")
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 5125eee4
......@@ -1992,7 +1992,8 @@ static bool is_or(struct prog_entry *prog, int i)
static int ftrace_function_set_filter(struct perf_event *event,
struct event_filter *filter)
{
struct prog_entry *prog = filter->prog;
struct prog_entry *prog = rcu_dereference_protected(filter->prog,
lockdep_is_held(&event_mutex));
struct function_filter_data data = {
.first_filter = 1,
.first_notrace = 1,
......
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