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Message-ID: <173608130975.1253657.5725356281406948364.stgit@devnote2>
Date: Sun, 5 Jan 2025 21:48:29 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
Peter Zijlstra <peterz@...radead.org>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
"David S . Miller" <davem@...emloft.net>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Oleg Nesterov <oleg@...hat.com>,
Tzvetomir Stoyanov <tz.stoyanov@...il.com>,
Naveen N Rao <naveen@...nel.org>,
Josh Poimboeuf <jpoimboe@...nel.org>,
Jason Baron <jbaron@...mai.com>,
Ard Biesheuvel <ardb@...nel.org>,
linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org
Subject: [PATCH v2 5/6] tracing: Use __free() for kprobe events to cleanup
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Use __free() in trace_kprobe.c to cleanup code.
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
Changes in v2:
- Instead of using no_free_ptr(), just assign NULL to the registered pointer.
---
kernel/trace/trace_kprobe.c | 57 ++++++++++++++++++++-----------------------
1 file changed, 26 insertions(+), 31 deletions(-)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 4c3e316454a0..e1ae65f57bf9 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -8,6 +8,7 @@
#define pr_fmt(fmt) "trace_kprobe: " fmt
#include <linux/bpf-cgroup.h>
+#include <linux/cleanup.h>
#include <linux/security.h>
#include <linux/module.h>
#include <linux/uaccess.h>
@@ -257,6 +258,8 @@ static void free_trace_kprobe(struct trace_kprobe *tk)
}
}
+DEFINE_FREE(trace_kprobe, struct trace_kprobe *, free_trace_kprobe(_T))
+
/*
* Allocate new trace_probe and initialize it (including kprobes).
*/
@@ -268,7 +271,7 @@ static struct trace_kprobe *alloc_trace_kprobe(const char *group,
int maxactive,
int nargs, bool is_return)
{
- struct trace_kprobe *tk;
+ struct trace_kprobe *tk __free(trace_kprobe) = NULL;
int ret = -ENOMEM;
tk = kzalloc(struct_size(tk, tp.args, nargs), GFP_KERNEL);
@@ -277,12 +280,12 @@ static struct trace_kprobe *alloc_trace_kprobe(const char *group,
tk->nhit = alloc_percpu(unsigned long);
if (!tk->nhit)
- goto error;
+ return ERR_PTR(ret);
if (symbol) {
tk->symbol = kstrdup(symbol, GFP_KERNEL);
if (!tk->symbol)
- goto error;
+ return ERR_PTR(ret);
tk->rp.kp.symbol_name = tk->symbol;
tk->rp.kp.offset = offs;
} else
@@ -299,13 +302,10 @@ static struct trace_kprobe *alloc_trace_kprobe(const char *group,
ret = trace_probe_init(&tk->tp, event, group, false, nargs);
if (ret < 0)
- goto error;
+ return ERR_PTR(ret);
dyn_event_init(&tk->devent, &trace_kprobe_ops);
- return tk;
-error:
- free_trace_kprobe(tk);
- return ERR_PTR(ret);
+ return_ptr(tk);
}
static struct trace_kprobe *find_trace_kprobe(const char *event,
@@ -861,11 +861,12 @@ static int __trace_kprobe_create(int argc, const char *argv[])
* Type of args:
* FETCHARG:TYPE : use TYPE instead of unsigned long.
*/
- struct trace_kprobe *tk = NULL;
+ struct trace_kprobe *tk __free(trace_kprobe) = NULL;
int i, len, new_argc = 0, ret = 0;
bool is_return = false;
- char *symbol = NULL, *tmp = NULL;
- const char **new_argv = NULL;
+ char *symbol __free(kfree) = NULL;
+ char *tmp = NULL;
+ const char **new_argv __free(kfree) = NULL;
const char *event = NULL, *group = KPROBE_EVENT_SYSTEM;
enum probe_print_type ptype;
int maxactive = 0;
@@ -874,7 +875,7 @@ static int __trace_kprobe_create(int argc, const char *argv[])
char buf[MAX_EVENT_NAME_LEN];
char gbuf[MAX_EVENT_NAME_LEN];
char abuf[MAX_BTF_ARGS_LEN];
- char *dbuf = NULL;
+ char *dbuf __free(kfree) = NULL;
struct traceprobe_parse_context ctx = { .flags = TPARG_FL_KERNEL };
switch (argv[0][0]) {
@@ -931,7 +932,7 @@ static int __trace_kprobe_create(int argc, const char *argv[])
/* Check whether uprobe event specified */
if (strchr(argv[1], '/') && strchr(argv[1], ':')) {
ret = -ECANCELED;
- goto error;
+ goto out;
}
/* a symbol specified */
symbol = kstrdup(argv[1], GFP_KERNEL);
@@ -1035,7 +1036,7 @@ static int __trace_kprobe_create(int argc, const char *argv[])
ctx.offset = 0;
ret = traceprobe_parse_probe_arg(&tk->tp, i, argv[i], &ctx);
if (ret)
- goto error; /* This can be -ENOMEM */
+ goto out; /* This can be -ENOMEM */
}
/* entry handler for kretprobe */
if (is_return && tk->tp.entry_arg) {
@@ -1046,7 +1047,7 @@ static int __trace_kprobe_create(int argc, const char *argv[])
ptype = is_return ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL;
ret = traceprobe_set_print_fmt(&tk->tp, ptype);
if (ret < 0)
- goto error;
+ goto out;
ret = register_trace_kprobe(tk);
if (ret) {
@@ -1057,21 +1058,20 @@ static int __trace_kprobe_create(int argc, const char *argv[])
trace_probe_log_err(0, BAD_PROBE_ADDR);
else if (ret != -ENOMEM && ret != -EEXIST)
trace_probe_log_err(0, FAIL_REG_PROBE);
- goto error;
- }
+ } else
+ /*
+ * Here, 'tk' has been registered to the list successfully,
+ * so we don't need to free it.
+ */
+ tk = NULL;
out:
traceprobe_finish_parse(&ctx);
trace_probe_log_clear();
- kfree(new_argv);
- kfree(symbol);
- kfree(dbuf);
return ret;
parse_error:
ret = -EINVAL;
-error:
- free_trace_kprobe(tk);
goto out;
}
@@ -1893,7 +1893,7 @@ create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
bool is_return)
{
enum probe_print_type ptype;
- struct trace_kprobe *tk;
+ struct trace_kprobe *tk __free(trace_kprobe) = NULL;
int ret;
char *event;
@@ -1924,19 +1924,14 @@ create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
ptype = trace_kprobe_is_return(tk) ?
PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL;
- if (traceprobe_set_print_fmt(&tk->tp, ptype) < 0) {
- ret = -ENOMEM;
- goto error;
- }
+ if (traceprobe_set_print_fmt(&tk->tp, ptype) < 0)
+ return ERR_PTR(-ENOMEM);
ret = __register_trace_kprobe(tk);
if (ret < 0)
- goto error;
+ return ERR_PTR(ret);
return trace_probe_event_call(&tk->tp);
-error:
- free_trace_kprobe(tk);
- return ERR_PTR(ret);
}
void destroy_local_trace_kprobe(struct trace_event_call *event_call)
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