From 7fa598f9706d40bd16f2ab286bdf5808e1393d35 Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (VMware)" Date: Wed, 27 Oct 2021 12:08:54 -0400 Subject: [PATCH] tracing: Do not warn when connecting eprobe to non existing event When the syscall trace points are not configured in, the kselftests for ftrace will try to attach an event probe (eprobe) to one of the system call trace points. This triggered a WARNING, because the failure only expects to see memory issues. But this is not the only failure. The user may attempt to attach to a non existent event, and the kernel must not warn about it. Link: https://lkml.kernel.org/r/20211027120854.0680aa0f@gandalf.local.home Fixes: 7491e2c442781 ("tracing: Add a probe that attaches to trace events") Signed-off-by: Steven Rostedt (VMware) --- kernel/trace/trace_eprobe.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c index c4a15ae..5c5f208 100644 --- a/kernel/trace/trace_eprobe.c +++ b/kernel/trace/trace_eprobe.c @@ -904,8 +904,8 @@ static int __trace_eprobe_create(int argc, const char *argv[]) if (IS_ERR(ep)) { ret = PTR_ERR(ep); - /* This must return -ENOMEM, else there is a bug */ - WARN_ON_ONCE(ret != -ENOMEM); + /* This must return -ENOMEM or misssing event, else there is a bug */ + WARN_ON_ONCE(ret != -ENOMEM && ret != -ENODEV); ep = NULL; goto error; } -- 2.7.4