Re: [PATCH v6 0/4] tracing/fprobe: Support comma-separated symbol lists and :entry/:exit suffixes

[Google]

Hi,

Sorry, I completely missed this series. Let me review it.

Thank you,

On Thu,  5 Feb 2026 08:58:38 -0500
"Seokwoo Chung (Ryan)" <seokwoo.chung130@xxxxxxxxx> wrote:

> Extend the fprobe event interface to accept comma-separated symbol lists
> with ! exclusion prefix, and :entry/:exit suffixes as an alternative to
> %return.  Single-symbol probes retain full backward compatibility with
> %return.
> 
> Example usage:
>   f:mygroup/myevent vfs_read,!vfs_write,vfs_open:entry
>   f:mygroup/myexit  vfs_read,vfs_open:exit
> 
> Changes since v5:
>   - Fix missing closing brace in the empty-token check that caused a
>     build error.
>   - Remove redundant strchr/strstr checks for tracepoint validation;
>     the character validation loop already rejects ',', ':', and '%'.
>   - Add trace_probe_log_err() to the tracepoint character validation
>     loop so users see what went wrong in tracefs/error_log (reviewer
>     feedback from Masami Hiramatsu).
>   - Remove unnecessary braces around single-statement if per kernel
>     coding style (reviewer feedback).
>   - Extract list parsing into parse_fprobe_list() to keep
>     parse_fprobe_spec() focused (reviewer feedback).
>   - New patch 2/4: add glob_match_comma_list() in kernel/trace/fprobe.c
>     so register_fprobe() correctly handles comma-separated filter
>     strings.  Without this, enabling a list-mode fprobe event failed
>     with "Could not enable event" because glob_match() does not
>     understand commas.
>   - Reorder: documentation patch now comes after all code changes.
>   - Updated selftest commit message to note that existing tests
>     (add_remove_fprobe.tc, fprobe_syntax_errors.tc,
>     add_remove_fprobe_repeat.tc) report UNSUPPORTED because their
>     "requires" lines still check for the old %return syntax in README.
>     Their requires lines need updating in a follow-up patch.
> 
> Tested in QEMU/KVM but I am not too confident if I configured correctly and
> would like to ask for further testing. 
> 
> Seokwoo Chung (Ryan) (4):
>   tracing/fprobe: Support comma-separated symbols and :entry/:exit
>   fprobe: Support comma-separated filters in register_fprobe()
>   docs: tracing/fprobe: Document list filters and :entry/:exit
>   selftests/ftrace: Add accept cases for fprobe list syntax
> 
>  Documentation/trace/fprobetrace.rst           |  17 +-
>  kernel/trace/fprobe.c                         |  30 ++-
>  kernel/trace/trace.c                          |   3 +-
>  kernel/trace/trace_fprobe.c                   | 219 ++++++++++++++----
>  .../ftrace/test.d/dynevent/fprobe_list.tc     |  92 ++++++++
>  5 files changed, 308 insertions(+), 53 deletions(-)
>  create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/fprobe_list.tc
> 
> -- 
> 2.43.0
> 
> 


-- 
Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>