linux-kernel - Re: [PATCHv5 bpf-next 3/9] ftrace: Export some of hash related functions

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Message-ID: <aUUag8LVUy2CTNpS@krava>
Date: Fri, 19 Dec 2025 10:27:31 +0100
From: Jiri Olsa <olsajiri@...il.com>
To: Steven Rostedt <rostedt@...nel.org>
Cc: Florent Revest <revest@...gle.com>, Mark Rutland <mark.rutland@....com>,
	bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Menglong Dong <menglong8.dong@...il.com>,
	Song Liu <song@...nel.org>
Subject: Re: [PATCHv5 bpf-next 3/9] ftrace: Export some of hash related
 functions

On Wed, Dec 17, 2025 at 08:07:12PM -0500, Steven Rostedt wrote:
> On Mon, 15 Dec 2025 22:13:56 +0100
> Jiri Olsa <jolsa@...nel.org> wrote:
> 
> > index 505b7d3f5641..c0a72fcae1f6 100644
> > --- a/include/linux/ftrace.h
> > +++ b/include/linux/ftrace.h
> > @@ -82,6 +82,7 @@ static inline void early_trace_init(void) { }
> >  
> >  struct module;
> >  struct ftrace_hash;
> > +struct ftrace_func_entry;
> >  
> >  #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_MODULES) && \
> >  	defined(CONFIG_DYNAMIC_FTRACE)
> > @@ -405,6 +406,14 @@ enum ftrace_ops_cmd {
> >  typedef int (*ftrace_ops_func_t)(struct ftrace_ops *op, enum ftrace_ops_cmd cmd);
> >  
> >  #ifdef CONFIG_DYNAMIC_FTRACE
> > +
> > +#define FTRACE_HASH_DEFAULT_BITS 10
> > +
> > +struct ftrace_hash *alloc_ftrace_hash(int size_bits);
> > +void free_ftrace_hash(struct ftrace_hash *hash);
> > +struct ftrace_func_entry *add_hash_entry_direct(struct ftrace_hash *hash,
> 
> As this is no longer static and is exported to other users within the
> kernel, it should be renamed to: add_ftrace_hash_entry_direct()
> to keep the namespace unique.

ok, will change

jirka

> 
> -- Steve
> 
> > +						unsigned long ip, unsigned long direct);
> > +
> >  /* The hash used to know what functions callbacks trace */
> >  struct ftrace_ops_hash {
> >  	struct ftrace_hash __rcu	*notrace_hash;