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selftests/ftrace: Fix multiple kprobe testcase

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[ Upstream commit 5cc6c8d4a9 ]

Fix multiple kprobe event testcase to work it correctly.
There are 2 bugfixes.
 - Since `wc -l FILE` returns not only line number but also
   FILE filename, following "if" statement always failed.
   Fix this bug by replacing it with 'cat FILE | wc -l'
 - Since "while do-done loop" block with pipeline becomes a
   subshell, $N local variable is not update outside of
   the loop.
   Fix this bug by using actual target number (256) instead
   of $N.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Masami Hiramatsu 2019-11-26 17:34:42 +09:00 committed by Greg Kroah-Hartman
parent c9f08701e6
commit f6a1ef2528
1 changed files with 3 additions and 3 deletions
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6
tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc
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@ -20,9 +20,9 @@ while read i; do
test $N -eq 256 && break
done
L=`wc -l kprobe_events`
if [ $L -ne $N ]; then
echo "The number of kprobes events ($L) is not $N"
L=`cat kprobe_events | wc -l`
if [ $L -ne 256 ]; then
echo "The number of kprobes events ($L) is not 256"
exit_fail
fi