[PATCH v2 06/10] lib/test_fprobe: Add a testcase for skipping exit_handler

From: Masami Hiramatsu (Google)
Date: Tue Jan 31 2023 - 11:16:21 EST


From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>

Add a testcase for skipping exit_handler if entry_handler
returns !0.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
---
lib/test_fprobe.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/lib/test_fprobe.c b/lib/test_fprobe.c
index 9fa2ac9eda83..0fe5273e960b 100644
--- a/lib/test_fprobe.c
+++ b/lib/test_fprobe.c
@@ -21,6 +21,7 @@ static u32 (*target_nest)(u32 value, u32 (*nest)(u32));
static unsigned long target_ip;
static unsigned long target2_ip;
static unsigned long target_nest_ip;
+static int entry_return_value;

static noinline u32 fprobe_selftest_target(u32 value)
{
@@ -52,7 +53,7 @@ static notrace int fp_entry_handler(struct fprobe *fp, unsigned long ip,
} else
KUNIT_EXPECT_NULL(current_test, data);

- return 0;
+ return entry_return_value;
}

static notrace void fp_exit_handler(struct fprobe *fp, unsigned long ip,
@@ -205,6 +206,28 @@ static void test_fprobe_nest(struct kunit *test)
KUNIT_EXPECT_EQ(test, 0, unregister_fprobe(&fp));
}

+static void test_fprobe_skip(struct kunit *test)
+{
+ struct fprobe fp = {
+ .entry_handler = fp_entry_handler,
+ .exit_handler = fp_exit_handler,
+ };
+
+ current_test = test;
+ KUNIT_EXPECT_EQ(test, 0, register_fprobe(&fp, "fprobe_selftest_target", NULL));
+
+ entry_return_value = 1;
+ entry_val = 0;
+ exit_val = 0;
+ target(rand1);
+ KUNIT_EXPECT_NE(test, 0, entry_val);
+ KUNIT_EXPECT_EQ(test, 0, exit_val);
+ KUNIT_EXPECT_EQ(test, 0, fp.nmissed);
+ entry_return_value = 0;
+
+ KUNIT_EXPECT_EQ(test, 0, unregister_fprobe(&fp));
+}
+
static unsigned long get_ftrace_location(void *func)
{
unsigned long size, addr = (unsigned long)func;
@@ -234,6 +257,7 @@ static struct kunit_case fprobe_testcases[] = {
KUNIT_CASE(test_fprobe_syms),
KUNIT_CASE(test_fprobe_data),
KUNIT_CASE(test_fprobe_nest),
+ KUNIT_CASE(test_fprobe_skip),
{}
};