[PATCH AUTOSEL 4.19 116/237] selftests/ftrace: Fix to test kprobe $comm arg only if available

Sasha Levin
2019-11-16T15:43:39Z

From: Masami Hiramatsu <mhiramat@kernel.org>

[ Upstream commit 2452c96e617a0ff6fb2692e55217a3fa57a7322c ]

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 <mhiramat@kernel.org>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc | 3 +++
1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc
index d026ff4e562f3..92ffb3bd33d82 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc
@@ -78,8 +78,11 @@ 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"
+fi

: "Indirect memory access"
test_goodarg "+0(${GOODREG})" "-0(${GOODREG})" "+10(\$stack)" \
--
2.20.1