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Message-ID: <173344391869.50709.13076453585574096968.stgit@devnote2>
Date: Fri, 6 Dec 2024 09:11:58 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>,
Steven Rostedt <rostedt@...dmis.org>,
Florent Revest <revest@...omium.org>
Cc: linux-trace-kernel@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
bpf <bpf@...r.kernel.org>,
Alexei Starovoitov <ast@...nel.org>,
Jiri Olsa <jolsa@...nel.org>,
Alan Maguire <alan.maguire@...cle.com>,
Mark Rutland <mark.rutland@....com>,
linux-arch@...r.kernel.org
Subject: [PATCH v20 14/19] tracing/fprobe: Remove nr_maxactive from fprobe
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Remove depercated fprobe::nr_maxactive. This involves fprobe events to
rejects the maxactive number.
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
Changes in v2:
- Newly added.
---
include/linux/fprobe.h | 2 --
kernel/trace/trace_fprobe.c | 43 ++++++-------------------------------------
2 files changed, 6 insertions(+), 39 deletions(-)
diff --git a/include/linux/fprobe.h b/include/linux/fprobe.h
index 91337bcb452f..702099f08929 100644
--- a/include/linux/fprobe.h
+++ b/include/linux/fprobe.h
@@ -54,7 +54,6 @@ struct fprobe_hlist {
* @nmissed: The counter for missing events.
* @flags: The status flag.
* @entry_data_size: The private data storage size.
- * @nr_maxactive: The max number of active functions. (*deprecated)
* @entry_handler: The callback function for function entry.
* @exit_handler: The callback function for function exit.
* @hlist_array: The fprobe_hlist for fprobe search from IP hash table.
@@ -63,7 +62,6 @@ struct fprobe {
unsigned long nmissed;
unsigned int flags;
size_t entry_data_size;
- int nr_maxactive;
fprobe_entry_cb entry_handler;
fprobe_exit_cb exit_handler;
diff --git a/kernel/trace/trace_fprobe.c b/kernel/trace/trace_fprobe.c
index 5030aaae8183..f487fadc2c08 100644
--- a/kernel/trace/trace_fprobe.c
+++ b/kernel/trace/trace_fprobe.c
@@ -424,7 +424,6 @@ static struct trace_fprobe *alloc_trace_fprobe(const char *group,
const char *symbol,
struct tracepoint *tpoint,
struct module *mod,
- int maxactive,
int nargs, bool is_return)
{
struct trace_fprobe *tf;
@@ -445,7 +444,6 @@ static struct trace_fprobe *alloc_trace_fprobe(const char *group,
tf->tpoint = tpoint;
tf->mod = mod;
- tf->fp.nr_maxactive = maxactive;
ret = trace_probe_init(&tf->tp, event, group, false, nargs);
if (ret < 0)
@@ -1098,12 +1096,11 @@ static int __trace_fprobe_create(int argc, const char *argv[])
* FETCHARG:TYPE : use TYPE instead of unsigned long.
*/
struct trace_fprobe *tf = NULL;
- int i, len, new_argc = 0, ret = 0;
+ int i, new_argc = 0, ret = 0;
bool is_return = false;
char *symbol = NULL;
const char *event = NULL, *group = FPROBE_EVENT_SYSTEM;
const char **new_argv = NULL;
- int maxactive = 0;
char buf[MAX_EVENT_NAME_LEN];
char gbuf[MAX_EVENT_NAME_LEN];
char sbuf[KSYM_NAME_LEN];
@@ -1126,33 +1123,13 @@ static int __trace_fprobe_create(int argc, const char *argv[])
trace_probe_log_init("trace_fprobe", argc, argv);
- event = strchr(&argv[0][1], ':');
- if (event)
- event++;
-
- if (isdigit(argv[0][1])) {
- if (event)
- len = event - &argv[0][1] - 1;
- else
- len = strlen(&argv[0][1]);
- if (len > MAX_EVENT_NAME_LEN - 1) {
- trace_probe_log_err(1, BAD_MAXACT);
- goto parse_error;
- }
- memcpy(buf, &argv[0][1], len);
- buf[len] = '\0';
- ret = kstrtouint(buf, 0, &maxactive);
- if (ret || !maxactive) {
+ if (argv[0][1] != '\0') {
+ if (argv[0][1] != ':') {
+ trace_probe_log_set_index(0);
trace_probe_log_err(1, BAD_MAXACT);
goto parse_error;
}
- /* fprobe rethook instances are iterated over via a list. The
- * maximum should stay reasonable.
- */
- if (maxactive > RETHOOK_MAXACTIVE_MAX) {
- trace_probe_log_err(1, MAXACT_TOO_BIG);
- goto parse_error;
- }
+ event = &argv[0][2];
}
trace_probe_log_set_index(1);
@@ -1162,12 +1139,6 @@ static int __trace_fprobe_create(int argc, const char *argv[])
if (ret < 0)
goto parse_error;
- if (!is_return && maxactive) {
- trace_probe_log_set_index(0);
- trace_probe_log_err(1, BAD_MAXACT_TYPE);
- goto parse_error;
- }
-
trace_probe_log_set_index(0);
if (event) {
ret = traceprobe_parse_event_name(&event, &group, gbuf,
@@ -1235,7 +1206,7 @@ static int __trace_fprobe_create(int argc, const char *argv[])
/* setup a probe */
tf = alloc_trace_fprobe(group, event, symbol, tpoint, tp_mod,
- maxactive, argc, is_return);
+ argc, is_return);
if (IS_ERR(tf)) {
ret = PTR_ERR(tf);
/* This must return -ENOMEM, else there is a bug */
@@ -1315,8 +1286,6 @@ static int trace_fprobe_show(struct seq_file *m, struct dyn_event *ev)
seq_putc(m, 't');
else
seq_putc(m, 'f');
- if (trace_fprobe_is_return(tf) && tf->fp.nr_maxactive)
- seq_printf(m, "%d", tf->fp.nr_maxactive);
seq_printf(m, ":%s/%s", trace_probe_group_name(&tf->tp),
trace_probe_name(&tf->tp));
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