linux-kernel - [PATCH 2/3] selftests/ftrace: Pick only the first kprobe event to test

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Message-Id: <158834027133.28357.11196486193798517250.stgit@devnote2>
Date:   Fri,  1 May 2020 22:37:51 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Shuah Khan <shuah@...nel.org>, Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Li Philip <philip.li@...el.com>,
        Liu Yiding <yidingx.liu@...el.com>
Subject: [PATCH 2/3] selftests/ftrace: Pick only the first kprobe event to test

Since the kprobe/kprobe_args_type.tc reads out all event logs
from the trace buffer, the test can fail if there is another
fork event happens.
Use head command to pick only the first kprobe event from
the trace buffer to test the argument types.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 .../ftrace/test.d/kprobe/kprobe_args_type.tc       |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
index 1bcb67dcae26..81490ecaaa92 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
@@ -38,7 +38,7 @@ for width in 64 32 16 8; do
   echo 0 > events/kprobes/testprobe/enable
 
   : "Confirm the arguments is recorded in given types correctly"
-  ARGS=`grep "testprobe" trace | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
+  ARGS=`grep "testprobe" trace | head -n 1 | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
   check_types $ARGS $width
 
   : "Clear event for next loop"