linux-kernel - [PATCH v5 0/3] tracing/fprobe: Support comma-separated symbols and :entry/:exit

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Message-ID: <20260114221219.127777-1-seokwoo.chung130@gmail.com>
Date: Wed, 14 Jan 2026 17:12:16 -0500
From: "Seokwoo Chung (Ryan)" <seokwoo.chung130@...il.com>
To: rostedt@...dmis.org,
	mhiramat@...nel.org,
	corbet@....net,
	shuah@...nel.org
Cc: 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,
	"Seokwoo Chung (Ryan)" <seokwoo.chung130@...il.com>
Subject: [PATCH v5 0/3] tracing/fprobe: Support comma-separated symbols and :entry/:exit

This series extends fprobe dynamic events to accept a comma-separated list of
symbols and explicit/suffixes.

Currently, fprobe only supports a single symbol (or wildcard) per event. This
series allow users to specify a comma-separated list of symbols, including
exclusions, and to select entry/exit explicitly using /

Examples:
- f:[GRP/][EVENT] func1,func2,func3
- f:[GRP/][EVENT] func1,!func2,func3 (exclude with '!')

Logic changes:
- Refactor parsing logic into parse_fprobe_spec()
- Support comma-separated lists and '!' exclusions
- Add / suffixes for explicit entry/exit selection
- Preserve legacy single-symbol behavior (single symbols still accept %return)
- Disable BTF-based signature lookup when list/wildcard is used, since one
  function signature cannot apply to multiple functions
- Reject mixed legacy/new syntax where applicable (e.g. list + %return)
- Update tracefs/README and fprobe documentation
- Add ftrace selftests covering accepted list syntax cases

*Patch order is adjusted: code first, then docs, then selftest

Changes in v5:
- Reordered patches (code->docs->selftests) as suggested
- Addressed review feedback on README help text to show both legacy and list
  syntaxes
- Added missing traceprobe error IDs used by the new validation and fixed
  parsing/bracing issues found by automated builds
- Removed the dedicated list_mode field and infer list behavior from presence of
  filter/nofilter and keep struct trace_probe as the last member
- Link to v4: https://lore.kernel.org/linux-trace-kernel/20251127151218.4763b25c751bb2aac4b1ee36@kernel.org/

I am not fully confident the runtime testing coverage that I did is sufficient
across configs/architectures, so additional verification would be appreciated.

Best regards,
Ryan Chung

Seokwoo Chung (Ryan) (3):
  tracing/fprobe: Support comma-separated symbols and :entry/:exit
  docs: tracing/fprobe: Document list filters and :entry/:exit
  selftests/ftrace: Add accept cases for fprobe list syntax

 Documentation/trace/fprobetrace.rst           | 18 +++++--
 kernel/trace/trace.c                          |  4 +-
 kernel/trace/trace_fprobe.c                   | 49 ++++++++++---------
 kernel/trace/trace_probe.h                    |  2 +
 .../ftrace/test.d/dynevent/fprobe_list.tc     |  2 +-
 5 files changed, 47 insertions(+), 28 deletions(-)


base-commit: f0c13b210e4366e03bd9e8967347b06b227e20a4
-- 
2.43.0