linux-kernel - Re: [PATCH v5 v5 1/3] docs: tracing/fprobe: Document list filters and :entry/:exit

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Message-ID: <wqpijkdwziafpuci6js5mtfzro46bre4z7une547crcdzrlm67@kd4fgea5m6ov>
Date: Sun, 25 Jan 2026 15:23:17 -0500
From: Seokwoo Chung <seokwoo.chung130@...il.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: mhiramat@...nel.org, corbet@....net, shuah@...nel.org, 
	mathieu.desnoyers@...icios.com, linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v5 v5 1/3] docs: tracing/fprobe: Document list filters
 and :entry/:exit

On Tue, Jan 20, 2026 at 03:53:40PM -0500, Steven Rostedt wrote:
> On Sat, 17 Jan 2026 20:18:13 -0500
> "Seokwoo Chung (Ryan)" <seokwoo.chung130@...il.com> wrote:
> 
> > Update fprobe event documentation to describe comma-separated symbol lists,
> > exclusions, and explicit suffixes.
> 
> Usually, the documentation updates comes *after* the changes.
> 
> -- Steve
> 
Thanks for the comment. As you noticed, I sent another patch since I forgot to
put log. That said, please let me know if you want me to continue on this
series. My apologies on the ordering. I noted after Masami mentioned but I
misordered when sending. Thank you.

Best regards,
Ryan Chung
> > 
> > Signed-off-by: Seokwoo Chung (Ryan) <seokwoo.chung130@...il.com>
> > ---
> >  Documentation/trace/fprobetrace.rst | 17 ++++++++++++++---
> >  1 file changed, 14 insertions(+), 3 deletions(-)
> > 
> > diff --git a/Documentation/trace/fprobetrace.rst b/Documentation/trace/fprobetrace.rst
> > index b4c2ca3d02c1..bbcfd57f0005 100644
> > --- a/Documentation/trace/fprobetrace.rst
> > +++ b/Documentation/trace/fprobetrace.rst
> > @@ -25,14 +25,18 @@ Synopsis of fprobe-events
> >  -------------------------
> >  ::
> >  
> > -  f[:[GRP1/][EVENT1]] SYM [FETCHARGS]                       : Probe on function entry
> > -  f[MAXACTIVE][:[GRP1/][EVENT1]] SYM%return [FETCHARGS]     : Probe on function exit
> > +  f[:[GRP1/][EVENT1]] SYM[%return] [FETCHARGS]		    : Single function
> > +  f[:[GRP1/][EVENT1]] SYM[,[!]SYM[,...]][:entry|:exit] [FETCHARGS] :Multiple
> > +  function
> >    t[:[GRP2/][EVENT2]] TRACEPOINT [FETCHARGS]                : Probe on tracepoint
> >  
> >   GRP1           : Group name for fprobe. If omitted, use "fprobes" for it.
> >   GRP2           : Group name for tprobe. If omitted, use "tracepoints" for it.
> >   EVENT1         : Event name for fprobe. If omitted, the event name is
> > -                  "SYM__entry" or "SYM__exit".
> > +		  - For a single literal symbol, the event name is
> > +		    "SYM__entry" or "SYM__exit".
> > +		  - For a *list or any wildcard*, an explicit [GRP1/][EVENT1] is
> > +		    required; otherwise the parser rejects it.
> >   EVENT2         : Event name for tprobe. If omitted, the event name is
> >                    the same as "TRACEPOINT", but if the "TRACEPOINT" starts
> >                    with a digit character, "_TRACEPOINT" is used.
> > @@ -40,6 +44,13 @@ Synopsis of fprobe-events
> >                    can be probed simultaneously, or 0 for the default value
> >                    as defined in Documentation/trace/fprobe.rst
> >  
> > + SYM		: Function name or comma-separated list of symbols.
> > +		  - SYM prefixed with "!" are exclusions.
> > +		  - ":entry" suffix means it probes entry of given symbols
> > +		    (default)
> > +		  - ":exit" suffix means it probes exit of given symbols.
> > +		  - "%return" suffix means it probes exit of SYM (single
> > +		    symbol).
> >   FETCHARGS      : Arguments. Each probe can have up to 128 args.
> >    ARG           : Fetch "ARG" function argument using BTF (only for function
> >                    entry or tracepoint.) (\*1)
>