From 9c556b7c3f520d42c435c0d78b25c719c060f8a1 Mon Sep 17 00:00:00 2001 From: Naveen N Rao Date: Thu, 14 Dec 2023 10:47:02 +0530 Subject: trace/kprobe: Display the actual notrace function when rejecting a probe Trying to probe update_sd_lb_stats() using perf results in the below message in the kernel log: trace_kprobe: Could not probe notrace function _text This is because 'perf probe' specifies the kprobe location as an offset from '_text': $ sudo perf probe -D update_sd_lb_stats p:probe/update_sd_lb_stats _text+1830728 However, the error message is misleading and doesn't help convey the actual notrace function that is being probed. Fix this by looking up the actual function name that is being probed. With this fix, we now get the below message in the kernel log: trace_kprobe: Could not probe notrace function update_sd_lb_stats.constprop.0 Link: https://lore.kernel.org/all/20231214051702.1687300-1-naveen@kernel.org/ Signed-off-by: Naveen N Rao Acked-by: Masami Hiramatsu (Google) Signed-off-by: Masami Hiramatsu (Google) --- kernel/trace/trace_kprobe.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'kernel') diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 52f8b537dd0a..c4c6e0e0068b 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -487,8 +487,8 @@ static int __register_trace_kprobe(struct trace_kprobe *tk) return -EINVAL; if (within_notrace_func(tk)) { - pr_warn("Could not probe notrace function %s\n", - trace_kprobe_symbol(tk)); + pr_warn("Could not probe notrace function %ps\n", + (void *)trace_kprobe_address(tk)); return -EINVAL; } -- cgit v1.2.3