netdev - [PATCH bpf] net/bpfilter: specify the log level for the kmsg message

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Message-ID: <20210623040918.8683-1-glin@suse.com>
Date:   Wed, 23 Jun 2021 12:09:18 +0800
From:   Gary Lin <glin@...e.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
CC:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Martin Loviska <mloviska@...e.com>
Subject: [PATCH bpf] net/bpfilter: specify the log level for the kmsg message

Per the kmsg document(*), if we don't specify the log level with a
prefix "<N>" in the message string, the default log level will be
applied to the message. Since the default level could be warning(4),
this would make the log utility such as journalctl treat the message,
"Started bpfilter", as a warning. To avoid confusion, this commit adds
the prefix "<5>" to make the message always a notice.

(*) https://www.kernel.org/doc/Documentation/ABI/testing/dev-kmsg

Fixes: 36c4357c63f3 ("net: bpfilter: print umh messages to /dev/kmsg")
Reported-by: Martin Loviska <mloviska@...e.com>
Signed-off-by: Gary Lin <glin@...e.com>
---
 net/bpfilter/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bpfilter/main.c b/net/bpfilter/main.c
index 05e1cfc1e5cd..291a92546246 100644
--- a/net/bpfilter/main.c
+++ b/net/bpfilter/main.c
@@ -57,7 +57,7 @@ int main(void)
 {
 	debug_f = fopen("/dev/kmsg", "w");
 	setvbuf(debug_f, 0, _IOLBF, 0);
-	fprintf(debug_f, "Started bpfilter\n");
+	fprintf(debug_f, "<5>Started bpfilter\n");
 	loop();
 	fclose(debug_f);
 	return 0;
-- 
2.31.1