From: Wen Yang <[email protected]> Add KUnit tests covering the reactor register/unregister lifecycle (including duplicate and name-length rejection) and rv_react() dispatch (a no-op without a callback, exactly one invocation with one; the mdelay callback keeps the CPU busy so a timer interrupt exercises the LD_WAIT_SPIN lockdep context). The Kconfig entry is tristate so the tests can be built as a module when CONFIG_KUNIT=m; only RV_REACTORS is required.
Signed-off-by: Wen Yang <[email protected]> --- kernel/trace/rv/Kconfig | 12 +++ kernel/trace/rv/Makefile | 1 + kernel/trace/rv/rv_reactors_kunit.c | 143 ++++++++++++++++++++++++++++ 3 files changed, 156 insertions(+) create mode 100644 kernel/trace/rv/rv_reactors_kunit.c diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig index efa930f94ea4..9bfd429ffdea 100644 --- a/kernel/trace/rv/Kconfig +++ b/kernel/trace/rv/Kconfig @@ -113,6 +113,18 @@ config RV_REACT_PANIC Enables the panic reactor. The panic reactor emits a printk() message if an exception is found and panic()s the system. +config RV_REACTORS_KUNIT + tristate "KUnit tests for RV reactors" if !KUNIT_ALL_TESTS + depends on KUNIT + depends on RV_REACTORS + default KUNIT_ALL_TESTS + help + Enable KUnit tests for RV reactor registration and dispatch. + These tests verify the register/unregister lifecycle, duplicate + rejection, and that rv_react() correctly invokes callbacks. + + If unsure, say N. + config RV_MONITORS_KUNIT_TEST tristate "KUnit tests for RV monitors" if !KUNIT_ALL_TESTS depends on KUNIT && RV && RV_REACTORS diff --git a/kernel/trace/rv/Makefile b/kernel/trace/rv/Makefile index cdbf68c84f5a..c895d81dfdad 100644 --- a/kernel/trace/rv/Makefile +++ b/kernel/trace/rv/Makefile @@ -25,4 +25,5 @@ obj-$(CONFIG_RV_MON_WAKEUP) += monitors/wakeup/wakeup.o obj-$(CONFIG_RV_REACTORS) += rv_reactors.o obj-$(CONFIG_RV_REACT_PRINTK) += reactor_printk.o obj-$(CONFIG_RV_REACT_PANIC) += reactor_panic.o +obj-$(CONFIG_RV_REACTORS_KUNIT) += rv_reactors_kunit.o obj-$(CONFIG_RV_MONITORS_KUNIT_TEST) += rv_monitors_test.o diff --git a/kernel/trace/rv/rv_reactors_kunit.c b/kernel/trace/rv/rv_reactors_kunit.c new file mode 100644 index 000000000000..32c25dcf0cb6 --- /dev/null +++ b/kernel/trace/rv/rv_reactors_kunit.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit tests for RV reactor registration and dispatch. + */ + +#include <kunit/test.h> +#include <linux/rv.h> +#include <linux/delay.h> +#include <linux/atomic.h> +#include "rv.h" + +static struct rv_reactor test_reactor = { + .name = "kunit_test_reactor", + .description = "KUnit test reactor", +}; + +/* + * rv_unregister_reactor() on a reactor that was never registered would + * list_del() an uninitialized list_head, so track registration and only + * unregister in the teardown if it is still on the list. + */ +static bool test_reactor_registered; + +static int unregister_test_reactor(void) +{ + int ret = 0; + + if (test_reactor_registered) { + ret = rv_unregister_reactor(&test_reactor); + test_reactor_registered = false; + } + + return ret; +} + +/* + * The teardown action guarantees the reactor is unregistered even if a + * test fails mid-way, so a leftover entry cannot corrupt later tests. + */ +static void reactor_teardown(void *arg) +{ + unregister_test_reactor(); +} + +static void register_test_reactor(struct kunit *test) +{ + KUNIT_ASSERT_EQ(test, rv_register_reactor(&test_reactor), 0); + test_reactor_registered = true; + KUNIT_ASSERT_EQ(test, + kunit_add_action_or_reset(test, reactor_teardown, NULL), 0); +} + +static void test_register_unregister(struct kunit *test) +{ + register_test_reactor(test); + + KUNIT_EXPECT_EQ(test, unregister_test_reactor(), 0); +} + +static void test_double_register(struct kunit *test) +{ + register_test_reactor(test); + + KUNIT_EXPECT_EQ(test, rv_register_reactor(&test_reactor), -EINVAL); + + KUNIT_EXPECT_EQ(test, unregister_test_reactor(), 0); +} + +static void test_name_too_long(struct kunit *test) +{ + /* Name length of MAX_RV_REACTOR_NAME_SIZE (32) must be rejected. */ + static struct rv_reactor long_reactor = { + .name = "kunit_reactor_name_too_long_xxx_", + }; + + KUNIT_ASSERT_EQ(test, (int)strlen(long_reactor.name), + MAX_RV_REACTOR_NAME_SIZE); + KUNIT_EXPECT_EQ(test, rv_register_reactor(&long_reactor), -EINVAL); +} + +static struct kunit_case rv_reactor_registration_cases[] = { + KUNIT_CASE(test_register_unregister), + KUNIT_CASE(test_double_register), + KUNIT_CASE(test_name_too_long), + {} +}; + +static struct kunit_suite rv_reactor_registration_suite = { + .name = "rv_reactor_registration", + .test_cases = rv_reactor_registration_cases, +}; + +static atomic_t react_call_count; + +__printf(1, 0) static void mock_react(const char *msg, va_list args) +{ + atomic_inc(&react_call_count); + /* + * Hold the CPU for 5 ms so a timer interrupt is likely to fire + * inside rv_react()'s lockdep context, exercising the LD_WAIT_SPIN + * constraint. mdelay() is a calibrated busy-wait with no scheduler + * interaction. + */ + mdelay(5); +} + +static void test_react_no_callback(struct kunit *test) +{ + struct rv_monitor monitor = { + .name = "kunit_null_react", + }; + + /* rv_react() must silently return when monitor->react is NULL. */ + rv_react(&monitor, "no callback"); +} + +static void test_react_callback_invoked(struct kunit *test) +{ + struct rv_monitor monitor = { + .name = "kunit_dispatch_monitor", + .react = mock_react, + }; + + atomic_set(&react_call_count, 0); + rv_react(&monitor, "callback invocation test"); + KUNIT_EXPECT_EQ(test, atomic_read(&react_call_count), 1); +} + +static struct kunit_case rv_react_dispatch_cases[] = { + KUNIT_CASE(test_react_no_callback), + KUNIT_CASE(test_react_callback_invoked), + {} +}; + +static struct kunit_suite rv_react_dispatch_suite = { + .name = "rv_react_dispatch", + .test_cases = rv_react_dispatch_cases, +}; + +kunit_test_suites(&rv_reactor_registration_suite, &rv_react_dispatch_suite); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("KUnit tests for RV reactor registration and dispatch"); -- 2.25.1
