linux-kernel - [PATCH 08/10] ftrace/selftests: Update the direct call selftests to test two direct calls

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Message-Id: <20191108213450.748178236@goodmis.org>
Date:   Fri, 08 Nov 2019 16:28:42 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        X86 ML <x86@...nel.org>, Nadav Amit <nadav.amit@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Song Liu <songliubraving@...com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: [PATCH 08/10] ftrace/selftests: Update the direct call selftests to test two direct
 calls

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

The register_ftrace_direct() takes a different path if there's already a
direct call registered, but this was not tested in the self tests. Now that
there's a second direct caller test module, we can use this to test not only
one direct caller, but two.

Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 .../ftrace/test.d/direct/ftrace-direct.tc     | 16 +++++
 .../ftrace/test.d/direct/kprobe-direct.tc     | 59 +++++++++++--------
 2 files changed, 52 insertions(+), 23 deletions(-)

diff --git a/tools/testing/selftests/ftrace/test.d/direct/ftrace-direct.tc b/tools/testing/selftests/ftrace/test.d/direct/ftrace-direct.tc
index 8b8ed3cad51b..cbc7a30c2e0f 100644
--- a/tools/testing/selftests/ftrace/test.d/direct/ftrace-direct.tc
+++ b/tools/testing/selftests/ftrace/test.d/direct/ftrace-direct.tc
@@ -51,3 +51,19 @@ done
 
 echo nop > current_tracer
 rmmod ftrace-direct ||:
+
+# Now do the same thing with another direct function registered
+echo "Running with another ftrace direct function"
+
+rmmod ftrace-direct-too ||:
+modprobe ftrace-direct-too
+
+for t in `cat available_tracers`; do
+	if [ "$t" != "nop" ]; then
+		test_tracer $t
+	fi
+done
+
+echo nop > current_tracer
+rmmod ftrace-direct ||:
+rmmod ftrace-direct-too ||:
diff --git a/tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc b/tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc
index 1561106765e4..d901416cb014 100644
--- a/tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc
+++ b/tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc
@@ -44,28 +44,41 @@ disable_probe() {
 	echo 0 > events/kprobes/kwake/enable
 }
 
-# probe -> direct -> no direct > no probe
-enable_probe
-start_direct
-stop_direct
-disable_probe
-
-# probe -> direct -> no probe > no direct
-enable_probe
-start_direct
-disable_probe
-stop_direct
-
-# direct -> probe -> no probe > no direct
-start_direct
-enable_probe
-disable_probe
-stop_direct
-
-# direct -> probe -> no direct > no noprobe
-start_direct
-enable_probe
-stop_direct
-disable_probe
+test_kprobes() {
+	# probe -> direct -> no direct > no probe
+	enable_probe
+	start_direct
+	stop_direct
+	disable_probe
+
+	# probe -> direct -> no probe > no direct
+	enable_probe
+	start_direct
+	disable_probe
+	stop_direct
+
+	# direct -> probe -> no probe > no direct
+	start_direct
+	enable_probe
+	disable_probe
+	stop_direct
+
+	# direct -> probe -> no direct > no noprobe
+	start_direct
+	enable_probe
+	stop_direct
+	disable_probe
+}
+
+test_kprobes
+
+# Now do this with a second registered direct function
+echo "Running with another ftrace direct function"
+
+modprobe ftrace-direct-too
+
+test_kprobes
+
+rmmod ftrace-direct-too
 
 echo > kprobe_events
-- 
2.23.0