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Date:   Thu, 30 Aug 2018 23:16:13 +0900
From:   Masami Hiramatsu <>
To:     Shuah Khan <>, Steven Rostedt <>
Cc:     Ingo Molnar <>,
        Masami Hiramatsu <>,,
Subject: [PATCH v3 08/28] selftests/ftrace: Fix to test kprobe $comm arg only if available

Test $comm in kprobe-event argument syntax testcase
only if it is supported on the kernel because
$comm has been introduced 4.8 kernel.
So on older stable kernel, it should be skipped.

Signed-off-by: Masami Hiramatsu <>
 .../ftrace/test.d/kprobe/     |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/ b/tools/testing/selftests/ftrace/test.d/kprobe/
index d783a8ce0692..6f0f19953193 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/
@@ -75,8 +75,11 @@ test_badarg "\$stackp" "\$stack0+10" "\$stack1-10"
 echo "r ${PROBEFUNC} \$retval" > kprobe_events
 ! echo "p ${PROBEFUNC} \$retval" > kprobe_events
+# $comm was introduced in 4.8, older kernels reject it.
+if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then
 : "Comm access"
 test_goodarg "\$comm"
 : "Indirect memory access"
 test_goodarg "+0(${GOODREG})" "-0(${GOODREG})" "+10(\$stack)" \

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