On Fri, 20 Jan 2017 11:44:46 +0900
Namhyung Kim <namhy...@kernel.org> wrote:
> --- a/kernel/trace/trace.h
> +++ b/kernel/trace/trace.h
> @@ -787,6 +787,20 @@ extern void __trace_graph_return(struct trace_array *tr,
> struct ftrace_graph_ret *trace,
> unsigned long flags, int pc);
>
> +struct ftrace_hash {
> + unsigned long size_bits;
> + struct hlist_head *buckets;
> + unsigned long count;
> + struct rcu_head rcu;
> +};
> +
> +struct ftrace_func_entry *
> +ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
> +
> +static bool __always_inline ftrace_hash_empty(struct ftrace_hash *hash)
> +{
> + return !hash || !hash->count;
> +}
Note, I had to modify this patch and move this declaration outside of
the #ifdef CONFIG_FUNCTION_GRAPH_TRACER, as it failed to build when
function graph wasn't enabled. Function tracer uses this too.
-- Steve
>
> #ifdef CONFIG_DYNAMIC_FTRACE
> /* TODO: make this variable */
