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Message-ID: <20260114221341.128038-2-seokwoo.chung130@gmail.com>
Date: Wed, 14 Jan 2026 17:13:38 -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 1/3] tracing/fprobe: Support comma-separated symbols and :entry/:exit
Signed-off-by: Seokwoo Chung (Ryan) <seokwoo.chung130@...il.com>
---
kernel/trace/trace.c | 4 +--
kernel/trace/trace_fprobe.c | 49 ++++++++++++++++++++-----------------
kernel/trace/trace_probe.h | 2 ++
3 files changed, 31 insertions(+), 24 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 10cdcc7b194e..73b59d47dfe7 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5578,8 +5578,8 @@ static const char readme_msg[] =
"\t r[maxactive][:[<group>/][<event>]] <place> [<args>]\n"
#endif
#ifdef CONFIG_FPROBE_EVENTS
- "\t f[:[<group>/][<event>]] <func-name>[:entry|:exit] [<args>]\n"
- "\t (single symbols still accept %return)\n"
+ "\t f[:[<group>/][<event>]] <func-name>[%return] [<args>]\n"
+ "\t f[:[<group>/][<event>]] <func-list>[:entry|:exit] [<args>]\n"
"\t t[:[<group>/][<event>]] <tracepoint> [<args>]\n"
#endif
#ifdef CONFIG_HIST_TRIGGERS
diff --git a/kernel/trace/trace_fprobe.c b/kernel/trace/trace_fprobe.c
index 5a2a41eea603..1663c341ddb4 100644
--- a/kernel/trace/trace_fprobe.c
+++ b/kernel/trace/trace_fprobe.c
@@ -187,16 +187,23 @@ DEFINE_FREE(tuser_put, struct tracepoint_user *,
*/
struct trace_fprobe {
struct dyn_event devent;
- char *filter;
+
struct fprobe fp;
- bool list_mode;
- char *nofilter;
const char *symbol;
- struct trace_probe tp;
+ char *filter;
+ char *nofilter;
+
bool tprobe;
struct tracepoint_user *tuser;
+
+ struct trace_probe tp;
};
+static inline bool trace_fprobe_has_list(const struct trace_fprobe *tf)
+{
+ return tf->filter || tf->nofilter;
+}
+
static bool is_trace_fprobe(struct dyn_event *ev)
{
return ev->ops == &trace_fprobe_ops;
@@ -847,7 +854,7 @@ static int __register_trace_fprobe(struct trace_fprobe *tf)
* - list_mode: pass filter/nofilter
* - single: pass symbol only (legacy)
*/
- if (tf->list_mode)
+ if (trace_fprobe_has_list(tf))
return register_fprobe(&tf->fp, tf->filter, tf->nofilter);
return register_fprobe(&tf->fp, tf->symbol, NULL);
}
@@ -1188,11 +1195,18 @@ static int parse_fprobe_spec(const char *in, bool is_tracepoint,
*base = NULL; *filter = NULL; *nofilter = NULL;
*is_return = false; *list_mode = false;
- if (is_tracepoint) {
+ if (is_tracepoint)
+ {
if (strchr(in, ',') || strchr(in, ':'))
+ {
+ trace_probe_log_err(0, BAD_TP_NAME);
return -EINVAL;
+ }
if (strstr(in, "%return"))
+ {
+ trace_probe_log_err(p - in, BAD_TP_NAME);
return -EINVAL;
+ }
for (p = in; *p; p++)
if (!isalnum(*p) && *p != '_')
return -EINVAL;
@@ -1225,6 +1239,7 @@ static int parse_fprobe_spec(const char *in, bool is_tracepoint,
} else if (!strcmp(p, ":entry")) {
*(char *)p = '\0';
} else {
+ trace_probe_log_err(p - work, BAD_LIST_SUFFIX);
return -EINVAL;
}
}
@@ -1233,6 +1248,7 @@ static int parse_fprobe_spec(const char *in, bool is_tracepoint,
list = !!strchr(work, ',');
if (list && legacy_ret) {
+ trace_probe_log_err(p - work, BAD_LEGACY_RET);
return -EINVAL;
}
@@ -1245,12 +1261,9 @@ static int parse_fprobe_spec(const char *in, bool is_tracepoint,
if (list) {
char *tmp = b, *tok;
- size_t fsz, nfsz;
- fsz = nfsz = strlen(b) + 1;
-
- f = kzalloc(fsz, GFP_KERNEL);
- nf = kzalloc(nfsz, GFP_KERNEL);
+ f = kzalloc(strlen(b) + 1, GFP_KERNEL);
+ nf = kzalloc(strlen(b) + 1, GFP_KERNEL);
if (!f || !nf)
return -ENOMEM;
@@ -1261,6 +1274,7 @@ static int parse_fprobe_spec(const char *in, bool is_tracepoint,
if (*tok == '\0') {
trace_probe_log_err(tmp - b - 1, BAD_TP_NAME);
return -EINVAL;
+ }
if (neg)
tok++;
@@ -1455,17 +1469,8 @@ static int trace_fprobe_create_internal(int argc, const char *argv[],
/* carry list parsing result into tf */
if (!is_tracepoint) {
- tf->list_mode = list_mode;
- if (parsed_filter) {
- tf->filter = kstrdup(parsed_filter, GFP_KERNEL);
- if (!tf->filter)
- return -ENOMEM;
- }
- if (parsed_nofilter) {
- tf->nofilter = kstrdup(parsed_nofilter, GFP_KERNEL);
- if (!tf->nofilter)
- return -ENOMEM;
- }
+ tf->filter = no_free_ptr(parsed_filter);
+ tf->nofilter = no_free_ptr(parsed_nofilter);
}
/* parse arguments */
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 9fc56c937130..b8b0544eb7cd 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -494,9 +494,11 @@ extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
C(BAD_PROBE_ADDR, "Invalid probed address or symbol"), \
C(NON_UNIQ_SYMBOL, "The symbol is not unique"), \
C(BAD_RETPROBE, "Retprobe address must be an function entry"), \
+ C(BAD_LEGACY_RET, "Legacy %return not allowed with list"), \
C(NO_TRACEPOINT, "Tracepoint is not found"), \
C(BAD_TP_NAME, "Invalid character in tracepoint name"),\
C(BAD_ADDR_SUFFIX, "Invalid probed address suffix"), \
+ C(BAD_LIST_SUFFIX, "Bad list suffix"), \
C(NO_GROUP_NAME, "Group name is not specified"), \
C(GROUP_TOO_LONG, "Group name is too long"), \
C(BAD_GROUP_NAME, "Group name must follow the same rules as C identifiers"), \
--
2.43.0
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