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

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Message-ID: <20260120155340.2dac7fab@gandalf.local.home>
Date: Tue, 20 Jan 2026 15:53:40 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: "Seokwoo Chung (Ryan)" <seokwoo.chung130@...il.com>
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 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

> 
> 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)