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Date: Sun, 31 Jul 2022 12:23:33 -0300
From: Maíra Canal <mairacanal@...eup.net>
To: Sander Vanheule <sander@...nheule.net>,
linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Brendan Higgins <brendanhiggins@...gle.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
David Gow <davidgow@...gle.com>,
Borislav Petkov <bp@...en8.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
Marco Elver <elver@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Valentin Schneider <vschneid@...hat.com>,
Yury Norov <yury.norov@...il.com>
Subject: Re: [PATCH v5 4/5] lib/test: introduce cpumask KUnit test suite
Hi Sander
On 7/29/22 04:01, Sander Vanheule wrote:
> Add a basic suite of tests for cpumask, providing some tests for empty and
> completely filled cpumasks.
>
> Signed-off-by: Sander Vanheule <sander@...nheule.net>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Suggested-by: Yury Norov <yury.norov@...il.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Marco Elver <elver@...gle.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Valentin Schneider <vschneid@...hat.com>
> Cc: Brendan Higgins <brendanhiggins@...gle.com>
> Cc: David Gow <davidgow@...gle.com>
> Cc: Maíra Canal <mairacanal@...eup.net>
> ---
> Changes since v4:
> - Belated addition of Yury's Suggested-by:
> - Follow KUnit style more closely
> - Drop full check on cpu_possible_mask
> - Update last check on cpu_possible_mask
> - Log masks when starting test
> - Update commit message
>
> Changes since v3:
> - Test for_each_cpu*() over empty mask and cpu_possible_mask
> - Add Andy's Reviewed-by
> - Use num_{online,present,possible}_cpus() for builtin masks
> - Guard against CPU hotplugging during test for dynamic builtin CPU masks
>
> Changes since v2:
> - Rework for_each_* test macros, as suggested by Yury
>
> Changes since v1:
> - New patch
>
> lib/Kconfig.debug | 12 ++++
> lib/Makefile | 1 +
> lib/cpumask_test.c | 147 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 160 insertions(+)
> create mode 100644 lib/cpumask_test.c
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 2e24db4bff19..e85e74646178 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -2021,6 +2021,18 @@ config LKDTM
> Documentation on how to use the module can be found in
> Documentation/fault-injection/provoke-crashes.rst
>
> +config CPUMASK_KUNIT_TEST
> + tristate "KUnit test for cpumask" if !KUNIT_ALL_TESTS
> + depends on KUNIT
> + default KUNIT_ALL_TESTS
> + help
> + Enable to turn on cpumask tests, running at boot or module load time.
> +
> + For more information on KUnit and unit tests in general, please refer
> + to the KUnit documentation in Documentation/dev-tools/kunit/.
> +
> + If unsure, say N.
> +
> config TEST_LIST_SORT
> tristate "Linked list sorting test" if !KUNIT_ALL_TESTS
> depends on KUNIT
> diff --git a/lib/Makefile b/lib/Makefile
> index bcc7e8ea0cde..9f9db1376538 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -59,6 +59,7 @@ obj-$(CONFIG_TEST_BPF) += test_bpf.o
> obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
> obj-$(CONFIG_TEST_BITOPS) += test_bitops.o
> CFLAGS_test_bitops.o += -Werror
> +obj-$(CONFIG_CPUMASK_KUNIT_TEST) += cpumask_test.o
> obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
> obj-$(CONFIG_TEST_SIPHASH) += test_siphash.o
> obj-$(CONFIG_HASH_KUNIT_TEST) += test_hash.o
> diff --git a/lib/cpumask_test.c b/lib/cpumask_test.c
> new file mode 100644
> index 000000000000..0f8059a5e93b
> --- /dev/null
> +++ b/lib/cpumask_test.c
In order to make the tests at lib/ with more compliant naming, it would
make more sense to name it test_cpumask.c.
Thank you for the respin to the series! All tests are passing now.
Tested-by: Maíra Canal <mairacanal@...eup.net>
Best Regards,
- Maíra Canal
> @@ -0,0 +1,147 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * KUnit tests for cpumask.
> + *
> + * Author: Sander Vanheule <sander@...nheule.net>
> + */
> +
> +#include <kunit/test.h>
> +#include <linux/cpu.h>
> +#include <linux/cpumask.h>
> +
> +#define EXPECT_FOR_EACH_CPU_EQ(test, mask) \
> + do { \
> + const cpumask_t *m = (mask); \
> + int mask_weight = cpumask_weight(m); \
> + int cpu, iter = 0; \
> + for_each_cpu(cpu, m) \
> + iter++; \
> + KUNIT_EXPECT_EQ((test), mask_weight, iter); \
> + } while (0)
> +
> +#define EXPECT_FOR_EACH_CPU_NOT_EQ(test, mask) \
> + do { \
> + const cpumask_t *m = (mask); \
> + int mask_weight = cpumask_weight(m); \
> + int cpu, iter = 0; \
> + for_each_cpu_not(cpu, m) \
> + iter++; \
> + KUNIT_EXPECT_EQ((test), nr_cpu_ids - mask_weight, iter); \
> + } while (0)
> +
> +#define EXPECT_FOR_EACH_CPU_WRAP_EQ(test, mask) \
> + do { \
> + const cpumask_t *m = (mask); \
> + int mask_weight = cpumask_weight(m); \
> + int cpu, iter = 0; \
> + for_each_cpu_wrap(cpu, m, nr_cpu_ids / 2) \
> + iter++; \
> + KUNIT_EXPECT_EQ((test), mask_weight, iter); \
> + } while (0)
> +
> +#define EXPECT_FOR_EACH_CPU_BUILTIN_EQ(test, name) \
> + do { \
> + int mask_weight = num_##name##_cpus(); \
> + int cpu, iter = 0; \
> + for_each_##name##_cpu(cpu) \
> + iter++; \
> + KUNIT_EXPECT_EQ((test), mask_weight, iter); \
> + } while (0)
> +
> +static cpumask_t mask_empty;
> +static cpumask_t mask_all;
> +
> +#define STR_MASK(m) #m
> +#define TEST_CPUMASK_PRINT(test, mask) \
> + kunit_info(test, "%s = '%*pbl'\n", STR_MASK(mask), nr_cpumask_bits, cpumask_bits(mask))
> +
> +static void test_cpumask_weight(struct kunit *test)
> +{
> + KUNIT_EXPECT_TRUE(test, cpumask_empty(&mask_empty));
> + KUNIT_EXPECT_TRUE(test, cpumask_full(&mask_all));
> +
> + KUNIT_EXPECT_EQ(test, 0, cpumask_weight(&mask_empty));
> + KUNIT_EXPECT_EQ(test, nr_cpu_ids, cpumask_weight(cpu_possible_mask));
> + KUNIT_EXPECT_EQ(test, nr_cpumask_bits, cpumask_weight(&mask_all));
> +}
> +
> +static void test_cpumask_first(struct kunit *test)
> +{
> + KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_first(&mask_empty));
> + KUNIT_EXPECT_EQ(test, 0, cpumask_first(cpu_possible_mask));
> +
> + KUNIT_EXPECT_EQ(test, 0, cpumask_first_zero(&mask_empty));
> + KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_first_zero(cpu_possible_mask));
> +}
> +
> +static void test_cpumask_last(struct kunit *test)
> +{
> + KUNIT_EXPECT_LE(test, nr_cpumask_bits, cpumask_last(&mask_empty));
> + KUNIT_EXPECT_EQ(test, nr_cpu_ids - 1, cpumask_last(cpu_possible_mask));
> +}
> +
> +static void test_cpumask_next(struct kunit *test)
> +{
> + KUNIT_EXPECT_EQ(test, 0, cpumask_next_zero(-1, &mask_empty));
> + KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_next_zero(-1, cpu_possible_mask));
> +
> + KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_next(-1, &mask_empty));
> + KUNIT_EXPECT_EQ(test, 0, cpumask_next(-1, cpu_possible_mask));
> +}
> +
> +static void test_cpumask_iterators(struct kunit *test)
> +{
> + EXPECT_FOR_EACH_CPU_EQ(test, &mask_empty);
> + EXPECT_FOR_EACH_CPU_NOT_EQ(test, &mask_empty);
> + EXPECT_FOR_EACH_CPU_WRAP_EQ(test, &mask_empty);
> +
> + EXPECT_FOR_EACH_CPU_EQ(test, cpu_possible_mask);
> + EXPECT_FOR_EACH_CPU_NOT_EQ(test, cpu_possible_mask);
> + EXPECT_FOR_EACH_CPU_WRAP_EQ(test, cpu_possible_mask);
> +}
> +
> +static void test_cpumask_iterators_builtin(struct kunit *test)
> +{
> + EXPECT_FOR_EACH_CPU_BUILTIN_EQ(test, possible);
> +
> + /* Ensure the dynamic masks are stable while running the tests */
> + cpu_hotplug_disable();
> +
> + TEST_CPUMASK_PRINT(test, cpu_online_mask);
> + TEST_CPUMASK_PRINT(test, cpu_present_mask);
> +
> + EXPECT_FOR_EACH_CPU_BUILTIN_EQ(test, online);
> + EXPECT_FOR_EACH_CPU_BUILTIN_EQ(test, present);
> +
> + cpu_hotplug_enable();
> +}
> +
> +static int test_cpumask_init(struct kunit *test)
> +{
> + cpumask_clear(&mask_empty);
> + cpumask_setall(&mask_all);
> +
> + TEST_CPUMASK_PRINT(test, &mask_all);
> + TEST_CPUMASK_PRINT(test, cpu_possible_mask);
> +
> + return 0;
> +}
> +
> +static struct kunit_case test_cpumask_cases[] = {
> + KUNIT_CASE(test_cpumask_weight),
> + KUNIT_CASE(test_cpumask_first),
> + KUNIT_CASE(test_cpumask_last),
> + KUNIT_CASE(test_cpumask_next),
> + KUNIT_CASE(test_cpumask_iterators),
> + KUNIT_CASE(test_cpumask_iterators_builtin),
> + {}
> +};
> +
> +static struct kunit_suite test_cpumask_suite = {
> + .name = "cpumask",
> + .init = test_cpumask_init,
> + .test_cases = test_cpumask_cases,
> +};
> +kunit_test_suite(test_cpumask_suite);
> +
> +MODULE_LICENSE("GPL");
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