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lib/test_fprobe: Add a testcase for skipping exit_handler

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

Link: https://lkml.kernel.org/r/167526700658.433354.12922388040490848613.stgit@mhiramat.roam.corp.google.com

Cc: Florent Revest <revest@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu (Google) 2023-02-02 00:56:46 +09:00 committed by Steven Rostedt (Google)
parent 39d954200b
commit 87de2163a3
1 changed files with 25 additions and 1 deletions
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26
lib/test_fprobe.c
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@ -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),
{}
};