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Date: Sat, 2 Jul 2022 14:45:21 -0700
From: Yury Norov <yury.norov@...il.com>
To: Sander Vanheule <sander@...nheule.net>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
elver@...gle.com, gregkh@...uxfoundation.org,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>, vschneid@...hat.com,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H . Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v4 3/5] lib/test: Introduce cpumask KUnit test suite
On Sat, Jul 02, 2022 at 06:08:26PM +0200, 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>
> ---
>
> Notes:
> 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
We have a special tag for it:
Suggested-by: Yury Norov <yury.norov@...il.com>
>
> Changes since v1:
> - New patch
>
> lib/Kconfig.debug | 9 +++
> lib/Makefile | 1 +
> lib/test_cpumask.c | 138 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 148 insertions(+)
> create mode 100644 lib/test_cpumask.c
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 2e24db4bff19..04aaa20d50f9 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -2021,6 +2021,15 @@ config LKDTM
> Documentation on how to use the module can be found in
> Documentation/fault-injection/provoke-crashes.rst
>
> +config TEST_CPUMASK
> + tristate "cpumask tests" 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.
> +
> + 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..de3e47453fe8 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -99,6 +99,7 @@ obj-$(CONFIG_TEST_HMM) += test_hmm.o
> obj-$(CONFIG_TEST_FREE_PAGES) += test_free_pages.o
> obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
> obj-$(CONFIG_TEST_REF_TRACKER) += test_ref_tracker.o
> +obj-$(CONFIG_TEST_CPUMASK) += test_cpumask.o
> CFLAGS_test_fprobe.o += $(CC_FLAGS_FTRACE)
> obj-$(CONFIG_FPROBE_SANITY_TEST) += test_fprobe.o
> #
> diff --git a/lib/test_cpumask.c b/lib/test_cpumask.c
> new file mode 100644
> index 000000000000..a31a1622f1f6
> --- /dev/null
> +++ b/lib/test_cpumask.c
> @@ -0,0 +1,138 @@
> +// 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;
> +
> +static void test_cpumask_weight(struct kunit *test)
> +{
> + KUNIT_EXPECT_TRUE(test, cpumask_empty(&mask_empty));
> + KUNIT_EXPECT_TRUE(test, cpumask_full(cpu_possible_mask));
> + 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_cpumask_bits - 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();
> +
> + 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);
> +
> + 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");
> --
> 2.36.1
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