linux-kernel - [PATCH] selftests/ftrace: Return unsupported if no error

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Message-Id: <159040205682.10129.10826221002090446642.stgit@devnote2>
Date:   Mon, 25 May 2020 19:20:57 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Shuah Khan <skhan@...uxfoundation.org>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <shuah@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [PATCH] selftests/ftrace: Return unsupported if no error_log file

Check whether error_log file exists in tracing/error_log testcase
and return UNSUPPORTED if no error_log file.

This can happen if we run the ftracetest on the older stable
kernel.

Fixes: 4eab1cc461a6 ("selftests/ftrace: Add tracing/error_log testcase")
Cc: stable@...r.kernel.org
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 .../ftrace/test.d/ftrace/tracing-error-log.tc      |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc b/tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc
index 021c03fd885d..23465823532b 100644
--- a/tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc
@@ -14,6 +14,8 @@ if [ ! -f set_event ]; then
     exit_unsupported
 fi
 
+[ -f error_log ] || exit_unsupported
+
 ftrace_errlog_check 'event filter parse error' '((sig >= 10 && sig < 15) || dsig ^== 17) && comm != bash' 'events/signal/signal_generate/filter'
 
 exit 0