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Wed, 26 Nov 2025 10:41:12 -0800 (PST) Received: from pc.mynetworksettings.com ([2600:4041:4491:2000:9820:e89a:8e2a:90ba]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8846e445b1csm149919506d6.9.2025.11.26.10.41.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Nov 2025 10:41:12 -0800 (PST) From: "Seokwoo Chung (Ryan)" To: rostedt@goodmis.org, mhiramat@kernel.org, corbet@lwn.net, shuah@kernel.org Cc: mathieu.desnoyers@efficios.com, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, "Seokwoo Chung (Ryan)" Subject: [PATCH v4 0/3] Support comma-separated symbols and :entry/:exit Date: Wed, 26 Nov 2025 13:41:07 -0500 Message-ID: <20251126184110.72241-1-seokwoo.chung130@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Extend fprobe to support list-style filters and explicit entry/exit suffixes. Currentyl, fprobe only supports a single symbol (or wildcard) per event. This patch allows users to specify a comma-separated list of symbols. New Syntax: - f:[GRP/][EVENT] func1,func2,func3:entry - f:[GRP/][EVENT] func1,func2,func3:exit Logic changes: - Refactor parsing logic into 'parse_fprobe_spec' - Support '!' prefix for exclusion - Disable BTF lookup ('ctx->funcname = NULL') when a list or wildcard is used, as a single function signature cannot apply to multiple functions. - Reject legacy '%return' suffix when used with lists or wildcards - Update tracefs/README Testing: Verified on x86_64 via QEMU. Checked registration of lists, exclusions, and explicit suffixes. Verified rejection of invalid syntax including trailing commas and mixed legacy/new syntax. Seokwoo Chung (Ryan) (3): docs: tracing/fprobe: Document list filters and :entry/:exit tracing/fprobe: Support comma-separated symbols and :entry/:exit selftests/ftrace: Add accept cases for fprobe list syntax Changes in v4: - Added validation to reject trailing commas (empty tokens) in symbol lists - Added vaildation to reject mixed of list syntax with %return suffix - Refactored parse_fprobe_spec to user __free(kfree) for automatic memory cleanup - Removed the now-unused parse_symbol_and_return function to avoid compiler warnings. - Tigtened %return detection to ensure it only matches as a strict suffix, not a substring - Link to v3: https://lore.kernel.org/lkml/20250904103219.f4937968362bfff1ecd3f004@kernel.org/ Documentation/trace/fprobetrace.rst | 17 +- kernel/trace/trace.c | 3 +- kernel/trace/trace_fprobe.c | 209 ++++++++++++++---- .../ftrace/test.d/dynevent/fprobe_list.tc | 92 ++++++++ 4 files changed, 269 insertions(+), 52 deletions(-) create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/fprobe_list.tc -- 2.43.0