linux-kernel - Re: [PATCH 2/3] ftrace: Expose ftrace_hash_empty and ftrace_lookup

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Date:   Sat, 21 Jan 2017 09:27:06 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 2/3] ftrace: Expose ftrace_hash_empty and ftrace_lookup_ip

On Fri, Jan 20, 2017 at 02:54:20PM -0500, Steven Rostedt wrote:
> On Fri, 20 Jan 2017 11:44:46 +0900
> Namhyung Kim <namhyung@...nel.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.

Oops, my bad.

Did you modify it in your tree?  Or do you want me to resend v2?

Thanks,
Namhyung


> >  
> >  #ifdef CONFIG_DYNAMIC_FTRACE
> >  /* TODO: make this variable */
>