[PATCH 4/5] tracing/kprobes: Do not open code event reserve logic

Steven Rostedt
2021-11-30T02:43:27Z

As kprobe events use trace_event_buffer_commit() to commit the event to
the ftrace ring buffer, for consistency, it should use
trace_event_buffer_reserve() to allocate it, as the two functions are
related.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace_kprobe.c | 25 +++++++------------------
1 file changed, 7 insertions(+), 18 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 33272a7b6912..d10c01948e68 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1383,17 +1383,11 @@ __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,
if (trace_trigger_soft_disabled(trace_file))
return;

- fbuffer.trace_ctx = tracing_gen_ctx();
- fbuffer.trace_file = trace_file;
-
dsize = __get_data_size(&tk->tp, regs);

- fbuffer.event =
- trace_event_buffer_lock_reserve(&fbuffer.buffer, trace_file,
- call->event.type,
- sizeof(*entry) + tk->tp.size + dsize,
- fbuffer.trace_ctx);
- if (!fbuffer.event)
+ entry = trace_event_buffer_reserve(&fbuffer, trace_file,
+ sizeof(*entry) + tk->tp.size + dsize);
+ if (!entry)
return;

fbuffer.regs = regs;
@@ -1430,16 +1424,11 @@ __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
if (trace_trigger_soft_disabled(trace_file))
return;

- fbuffer.trace_ctx = tracing_gen_ctx();
- fbuffer.trace_file = trace_file;
-
dsize = __get_data_size(&tk->tp, regs);
- fbuffer.event =
- trace_event_buffer_lock_reserve(&fbuffer.buffer, trace_file,
- call->event.type,
- sizeof(*entry) + tk->tp.size + dsize,
- fbuffer.trace_ctx);
- if (!fbuffer.event)
+
+ entry = trace_event_buffer_reserve(&fbuffer, trace_file,
+ sizeof(*entry) + tk->tp.size + dsize);
+ if (!entry)
return;

fbuffer.regs = regs;
--
2.33.0