From: Steven Rostedt (VMware) Date: Thu, 5 Apr 2018 17:39:36 +0000 (-0400) Subject: tracing: Add rcu dereference annotation for filter->prog X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=1f3b0faa3e9dc713efce392af1f58542e735f822;p=openwrt%2Fstaging%2Fblogic.git 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: kbuild test robot Fixes: 80765597bc587 ("tracing: Rewrite filter logic to be simpler and faster") Signed-off-by: Steven Rostedt (VMware) --- diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index 703a416aa5c2..cf8460caa95c 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -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,