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Thu, 05 Feb 2026 05:59:02 -0800 (PST) From: "Seokwoo Chung (Ryan)" To: mhiramat@kernel.org Cc: rostedt@goodmis.org, corbet@lwn.net, shuah@kernel.org, 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 v6 2/4] fprobe: Support comma-separated filters in register_fprobe() Date: Thu, 5 Feb 2026 08:58:40 -0500 Message-ID: <20260205135842.20517-3-seokwoo.chung130@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260205135842.20517-1-seokwoo.chung130@gmail.com> References: <20260205135842.20517-1-seokwoo.chung130@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" register_fprobe() passes its filter and notfilter strings directly to glob_match(), which only understands shell-style globs (*, ?, [...]). Comma-separated symbol lists such as "vfs_read,vfs_open" never match any symbol because no kernel symbol contains a comma. Add glob_match_comma_list() that splits the filter on commas and checks each entry individually with glob_match(). The existing single-pattern fast path is preserved (no commas means the loop executes exactly once). This is required by the comma-separated fprobe list syntax introduced in the preceding patch; without it, enabling a list-mode fprobe event fails with "Could not enable event". Signed-off-by: Seokwoo Chung (Ryan) --- kernel/trace/fprobe.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c index 1188eefef07c..2acd24b80d04 100644 --- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -672,12 +672,38 @@ struct filter_match_data { struct module **mods; }; =20 +/* + * Check if @name matches any comma-separated glob pattern in @list. + * If @list contains no commas, this is equivalent to glob_match(). + */ +static bool glob_match_comma_list(const char *list, const char *name) +{ + const char *cur =3D list; + + while (*cur) { + const char *sep =3D strchr(cur, ','); + int len =3D sep ? sep - cur : strlen(cur); + char pat[KSYM_NAME_LEN]; + + if (len > 0 && len < KSYM_NAME_LEN) { + memcpy(pat, cur, len); + pat[len] =3D '\0'; + if (glob_match(pat, name)) + return true; + } + if (!sep) + break; + cur =3D sep + 1; + } + return false; +} + static int filter_match_callback(void *data, const char *name, unsigned lo= ng addr) { struct filter_match_data *match =3D data; =20 - if (!glob_match(match->filter, name) || - (match->notfilter && glob_match(match->notfilter, name))) + if (!glob_match_comma_list(match->filter, name) || + (match->notfilter && glob_match_comma_list(match->notfilter, name))) return 0; =20 if (!ftrace_location(addr)) --=20 2.43.0