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Message-ID: <175509539571.193596.4674012182718751429.stgit@devnote2>
Date: Wed, 13 Aug 2025 23:29:55 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org
Subject: [PATCH 2/4] tracing: eprobe: Cleanup eprobe event using __free()
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Use __free(trace_event_probe_cleanup) to remove unneeded gotos and
cleanup the last part of trace_eprobe_parse_filter().
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
kernel/trace/trace_eprobe.c | 71 ++++++++++++++++++-------------------------
1 file changed, 30 insertions(+), 41 deletions(-)
diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
index aaba765d54cf..f7a1ff509d7e 100644
--- a/kernel/trace/trace_eprobe.c
+++ b/kernel/trace/trace_eprobe.c
@@ -61,6 +61,9 @@ static void trace_event_probe_cleanup(struct trace_eprobe *ep)
kfree(ep);
}
+DEFINE_FREE(trace_event_probe_cleanup, struct trace_eprobe *,
+ if (!IS_ERR_OR_NULL(_T)) trace_event_probe_cleanup(_T))
+
static struct trace_eprobe *to_trace_eprobe(struct dyn_event *ev)
{
return container_of(ev, struct trace_eprobe, devent);
@@ -197,10 +200,10 @@ static struct trace_eprobe *alloc_event_probe(const char *group,
struct trace_event_call *event,
int nargs)
{
- struct trace_eprobe *ep;
+ struct trace_eprobe *ep __free(trace_event_probe_cleanup) = NULL;
const char *event_name;
const char *sys_name;
- int ret = -ENOMEM;
+ int ret;
if (!event)
return ERR_PTR(-ENODEV);
@@ -211,25 +214,22 @@ static struct trace_eprobe *alloc_event_probe(const char *group,
ep = kzalloc(struct_size(ep, tp.args, nargs), GFP_KERNEL);
if (!ep) {
trace_event_put_ref(event);
- goto error;
+ return ERR_PTR(-ENOMEM);
}
ep->event = event;
ep->event_name = kstrdup(event_name, GFP_KERNEL);
if (!ep->event_name)
- goto error;
+ return ERR_PTR(-ENOMEM);
ep->event_system = kstrdup(sys_name, GFP_KERNEL);
if (!ep->event_system)
- goto error;
+ return ERR_PTR(-ENOMEM);
ret = trace_probe_init(&ep->tp, this_event, group, false, nargs);
if (ret < 0)
- goto error;
+ return ERR_PTR(ret);
dyn_event_init(&ep->devent, &eprobe_dyn_event_ops);
- return ep;
-error:
- trace_event_probe_cleanup(ep);
- return ERR_PTR(ret);
+ return_ptr(ep);
}
static int eprobe_event_define_fields(struct trace_event_call *event_call)
@@ -856,13 +856,10 @@ static int trace_eprobe_parse_filter(struct trace_eprobe *ep, int argc, const ch
ret = create_event_filter(top_trace_array(), ep->event, ep->filter_str,
true, &dummy);
free_event_filter(dummy);
- if (ret)
- goto error;
-
- return 0;
-error:
- kfree(ep->filter_str);
- ep->filter_str = NULL;
+ if (ret) {
+ kfree(ep->filter_str);
+ ep->filter_str = NULL;
+ }
return ret;
}
@@ -874,6 +871,7 @@ static int __trace_eprobe_create(int argc, const char *argv[])
* Fetch args (no space):
* <name>=$<field>[:TYPE]
*/
+ struct trace_eprobe *ep __free(trace_event_probe_cleanup) = NULL;
const char *trlog __free(trace_probe_log_clear) = NULL;
const char *event = NULL, *group = EPROBE_EVENT_SYSTEM;
const char *sys_event = NULL, *sys_name = NULL;
@@ -881,7 +879,6 @@ static int __trace_eprobe_create(int argc, const char *argv[])
char *buf1 __free(kfree) = NULL;
char *buf2 __free(kfree) = NULL;
char *gbuf __free(kfree) = NULL;
- struct trace_eprobe *ep = NULL;
int ret = 0, filter_idx = 0;
int i, filter_cnt;
@@ -894,12 +891,12 @@ static int __trace_eprobe_create(int argc, const char *argv[])
if (event) {
gbuf = kmalloc(MAX_EVENT_NAME_LEN, GFP_KERNEL);
if (!gbuf)
- goto mem_error;
+ return -ENOMEM;
event++;
ret = traceprobe_parse_event_name(&event, &group, gbuf,
event - argv[0]);
if (ret)
- goto parse_error;
+ return -EINVAL;
}
trace_probe_log_set_index(1);
@@ -907,18 +904,18 @@ static int __trace_eprobe_create(int argc, const char *argv[])
buf2 = kmalloc(MAX_EVENT_NAME_LEN, GFP_KERNEL);
if (!buf2)
- goto mem_error;
+ return -ENOMEM;
ret = traceprobe_parse_event_name(&sys_event, &sys_name, buf2, 0);
if (ret || !sys_event || !sys_name) {
trace_probe_log_err(0, NO_EVENT_INFO);
- goto parse_error;
+ return -EINVAL;
}
if (!event) {
buf1 = kstrdup(sys_event, GFP_KERNEL);
if (!buf1)
- goto mem_error;
+ return -ENOMEM;
event = buf1;
}
@@ -934,8 +931,7 @@ static int __trace_eprobe_create(int argc, const char *argv[])
if (argc - 2 > MAX_TRACE_ARGS) {
trace_probe_log_set_index(2);
trace_probe_log_err(0, TOO_MANY_ARGS);
- ret = -E2BIG;
- goto error;
+ return -E2BIG;
}
scoped_guard(mutex, &event_mutex) {
@@ -949,15 +945,14 @@ static int __trace_eprobe_create(int argc, const char *argv[])
trace_probe_log_err(0, BAD_ATTACH_EVENT);
/* This must return -ENOMEM or missing event, else there is a bug */
WARN_ON_ONCE(ret != -ENOMEM && ret != -ENODEV);
- ep = NULL;
- goto error;
+ return ret;
}
if (filter_idx) {
trace_probe_log_set_index(filter_idx);
ret = trace_eprobe_parse_filter(ep, filter_cnt, argv + filter_idx);
if (ret)
- goto parse_error;
+ return -EINVAL;
} else
ep->filter_str = NULL;
@@ -967,11 +962,12 @@ static int __trace_eprobe_create(int argc, const char *argv[])
trace_probe_log_set_index(i + 2);
ret = trace_eprobe_tp_update_arg(ep, argv, i);
if (ret)
- goto error;
+ return ret;
}
ret = traceprobe_set_print_fmt(&ep->tp, PROBE_PRINT_EVENT);
if (ret < 0)
- goto error;
+ return ret;
+
init_trace_eprobe_call(ep);
scoped_guard(mutex, &event_mutex) {
ret = trace_probe_register_event_call(&ep->tp);
@@ -980,24 +976,17 @@ static int __trace_eprobe_create(int argc, const char *argv[])
trace_probe_log_set_index(0);
trace_probe_log_err(0, EVENT_EXIST);
}
- goto error;
+ return ret;
}
ret = dyn_event_add(&ep->devent, &ep->tp.event->call);
if (ret < 0) {
trace_probe_unregister_event_call(&ep->tp);
- goto error;
+ return ret;
}
+ /* To avoid freeing registered eprobe event, clear ep. */
+ ep = NULL;
}
return ret;
-
-mem_error:
- ret = -ENOMEM;
- goto error;
-parse_error:
- ret = -EINVAL;
-error:
- trace_event_probe_cleanup(ep);
- return ret;
}
/*
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