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Message-Id: <166792258988.919356.1550112303992706866.stgit@devnote3>
Date: Wed, 9 Nov 2022 00:49:49 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: linux-trace-kernel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
mhiramat@...nel.org, Florent Revest <revest@...omium.org>,
Mark Rutland <mark.rutland@....com>,
Will Deacon <will@...nel.org>
Subject: [RFC PATCH 4/9] lib/test_fprobe: Add a test case for nr_maxactive
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Add a test case for nr_maxactive. If the number of active
functions is more than nr_maxactive, it must be skipped.
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
lib/test_fprobe.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/lib/test_fprobe.c b/lib/test_fprobe.c
index 941bf5234c31..976fb3f7cb01 100644
--- a/lib/test_fprobe.c
+++ b/lib/test_fprobe.c
@@ -17,8 +17,10 @@ static u32 rand1, entry_val, exit_val;
/* Use indirect calls to avoid inlining the target functions */
static u32 (*target)(u32 value);
static u32 (*target2)(u32 value);
+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 noinline u32 fprobe_selftest_target(u32 value)
{
@@ -30,6 +32,11 @@ static noinline u32 fprobe_selftest_target2(u32 value)
return (value / div_factor) + 1;
}
+static noinline u32 fprobe_selftest_nest_target(u32 value, u32 (*nest)(u32))
+{
+ return nest(value + 2);
+}
+
static notrace void fp_entry_handler(struct fprobe *fp, unsigned long ip,
struct pt_regs *regs, void *data)
{
@@ -67,6 +74,19 @@ static notrace void fp_exit_handler(struct fprobe *fp, unsigned long ip,
KUNIT_EXPECT_NULL(current_test, data);
}
+static notrace void nest_entry_handler(struct fprobe *fp, unsigned long ip,
+ struct pt_regs *regs, void *data)
+{
+ KUNIT_EXPECT_FALSE(current_test, preemptible());
+}
+
+static notrace void nest_exit_handler(struct fprobe *fp, unsigned long ip,
+ struct pt_regs *regs, void *data)
+{
+ KUNIT_EXPECT_FALSE(current_test, preemptible());
+ KUNIT_EXPECT_EQ(current_test, ip, target_nest_ip);
+}
+
/* Test entry only (no rethook) */
static void test_fprobe_entry(struct kunit *test)
{
@@ -163,6 +183,25 @@ static void test_fprobe_data(struct kunit *test)
KUNIT_EXPECT_EQ(test, 0, unregister_fprobe(&fp));
}
+/* Test nr_maxactive */
+static void test_fprobe_nest(struct kunit *test)
+{
+ static const char *syms[] = {"fprobe_selftest_target", "fprobe_selftest_nest_target"};
+ struct fprobe fp = {
+ .entry_handler = nest_entry_handler,
+ .exit_handler = nest_exit_handler,
+ .nr_maxactive = 1,
+ };
+
+ current_test = test;
+ KUNIT_EXPECT_EQ(test, 0, register_fprobe_syms(&fp, syms, 2));
+
+ target_nest(rand1, target);
+ KUNIT_EXPECT_EQ(test, 1, fp.nmissed);
+
+ KUNIT_EXPECT_EQ(test, 0, unregister_fprobe(&fp));
+}
+
static unsigned long get_ftrace_location(void *func)
{
unsigned long size, addr = (unsigned long)func;
@@ -181,8 +220,10 @@ static int fprobe_test_init(struct kunit *test)
target = fprobe_selftest_target;
target2 = fprobe_selftest_target2;
+ target_nest = fprobe_selftest_nest_target;
target_ip = get_ftrace_location(target);
target2_ip = get_ftrace_location(target2);
+ target_nest_ip = get_ftrace_location(target_nest);
return 0;
}
@@ -192,6 +233,7 @@ static struct kunit_case fprobe_testcases[] = {
KUNIT_CASE(test_fprobe),
KUNIT_CASE(test_fprobe_syms),
KUNIT_CASE(test_fprobe_data),
+ KUNIT_CASE(test_fprobe_nest),
{}
};
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