diff options
| author | Masami Hiramatsu (Google) <mhiramat@kernel.org> | 2023-07-08 01:38:03 +0900 |
|---|---|---|
| committer | Masami Hiramatsu (Google) <mhiramat@kernel.org> | 2023-07-14 00:24:00 +0900 |
| commit | d5f28bb1ce04636b285726ee2a5afa3a514025f4 (patch) | |
| tree | cbe77110f009629bd62376cb70545aee47e9ea04 | |
| parent | 195b9cb5b288fec1c871ef89f78cc9a7461aad3a (diff) | |
fprobes: Add a comment why fprobe_kprobe_handler exits if kprobe is running
Add a comment the reason why fprobe_kprobe_handler() exits if any other
kprobe is running.
Link: https://lore.kernel.org/all/168874788299.159442.2485957441413653858.stgit@devnote2/
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Link: https://lore.kernel.org/all/20230706120916.3c6abf15@gandalf.local.home/
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
| -rw-r--r-- | kernel/trace/fprobe.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c index 2571f7f3d5f2..59321d22f43e 100644 --- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -100,6 +100,12 @@ static void fprobe_kprobe_handler(unsigned long ip, unsigned long parent_ip, return; } + /* + * This user handler is shared with other kprobes and is not expected to be + * called recursively. So if any other kprobe handler is running, this will + * exit as kprobe does. See the section 'Share the callbacks with kprobes' + * in Documentation/trace/fprobe.rst for more information. + */ if (unlikely(kprobe_running())) { fp->nmissed++; goto recursion_unlock; |