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X-CRM114-Status: GOOD ( 17.18 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a success and failure case for smp_cond_load_relaxed_timeout(). Both test cases wait on some state in smp_cond_load_relaxed_timeout(). In the success case we spawn a kthread that pokes the bit. Signed-off-by: Ankur Arora --- lib/Kconfig.debug | 10 +++ lib/tests/Makefile | 1 + lib/tests/barrier-timeout-test.c | 125 +++++++++++++++++++++++++++++++ 3 files changed, 136 insertions(+) create mode 100644 lib/tests/barrier-timeout-test.c diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 93f356d2b3d9..dcd2d60a9391 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2398,6 +2398,16 @@ config FPROBE_SANITY_TEST Say N if you are unsure. +config BARRIER_TIMEOUT_TEST + tristate "KUnit tests for smp_cond_load_relaxed_timeout()" + depends on KUNIT + default KUNIT_ALL_TESTS + help + Builds KUnit tests that validate wake-up and timeout handling paths + in smp_cond_load_relaxed_timeout(). + + Say N if you are unsure. + config BACKTRACE_SELF_TEST tristate "Self test for the backtrace code" depends on DEBUG_KERNEL diff --git a/lib/tests/Makefile b/lib/tests/Makefile index 05f74edbc62b..3504d677b7b8 100644 --- a/lib/tests/Makefile +++ b/lib/tests/Makefile @@ -20,6 +20,7 @@ CFLAGS_fortify_kunit.o += $(DISABLE_STRUCTLEAK_PLUGIN) obj-$(CONFIG_FORTIFY_KUNIT_TEST) += fortify_kunit.o CFLAGS_test_fprobe.o += $(CC_FLAGS_FTRACE) obj-$(CONFIG_FPROBE_SANITY_TEST) += test_fprobe.o +obj-$(CONFIG_BARRIER_TIMEOUT_TEST) += barrier-timeout-test.o obj-$(CONFIG_GLOB_KUNIT_TEST) += glob_kunit.o obj-$(CONFIG_HASHTABLE_KUNIT_TEST) += hashtable_test.o obj-$(CONFIG_HASH_KUNIT_TEST) += test_hash.o diff --git a/lib/tests/barrier-timeout-test.c b/lib/tests/barrier-timeout-test.c new file mode 100644 index 000000000000..d72200daa0f2 --- /dev/null +++ b/lib/tests/barrier-timeout-test.c @@ -0,0 +1,125 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit tests exercising smp_cond_load_relaxed_timeout(). + * + * Copyright (c) 2026, Oracle Corp. + * Author: Ankur Arora + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +MODULE_IMPORT_NS("EXPORTED_FOR_KUNIT_TESTING"); + +struct clock_state { + s64 start_time; + s64 end_time; +}; + +#define TIMEOUT_MSEC 2 +#define TEST_FLAG_VAL BIT(2) +static unsigned int flag; + +static s64 basic_clock(struct clock_state *clk) +{ + clk->end_time = local_clock(); + return clk->end_time; +} + +static void update_flags(void) +{ + WRITE_ONCE(flag, TEST_FLAG_VAL); +} + +static s64 mock_clock(struct clock_state *clk) +{ + s64 clk_mid = clk->start_time + (TIMEOUT_MSEC * NSEC_PER_MSEC)/2; + + clk->end_time = local_clock(); + if (clk->end_time >= clk_mid) + update_flags(); + return clk->end_time; +} + +typedef s64 (*clkfn_t)(struct clock_state *); + +static void test_smp_cond_relaxed_timeout(struct kunit *test, + clkfn_t clock, bool succeeds) +{ + struct clock_state clk = { + .start_time = local_clock(), + .end_time = local_clock(), + }; + s64 runtime, timeout_ns = TIMEOUT_MSEC * NSEC_PER_MSEC; + unsigned int result; + + result = smp_cond_load_relaxed_timeout(&flag, + (VAL & TEST_FLAG_VAL), + clock(&clk), + timeout_ns); + + runtime = clk.end_time - clk.start_time; + KUNIT_EXPECT_EQ(test, (bool)(result & TEST_FLAG_VAL), succeeds); + KUNIT_EXPECT_EQ(test, runtime <= timeout_ns, succeeds); +} + +static int smp_cond_threadfn(void *data) +{ + udelay(TIMEOUT_MSEC * USEC_PER_MSEC / 4); + + /* + * Update flags after a delay to give smp_cond_relaxed_timeout() + * time to get started. + */ + update_flags(); + return 0; +} + +static void smp_cond_relaxed_timeout_succeeds(struct kunit *test) +{ + struct task_struct *task; + + flag = 0; + + task = kthread_run(smp_cond_threadfn, &flag, "smp_cond_thread"); + + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, task); + test_smp_cond_relaxed_timeout(test, &basic_clock, true); + + kthread_stop(task); +} + +static void smp_cond_relaxed_timeout_mocked(struct kunit *test) +{ + flag = 0; + test_smp_cond_relaxed_timeout(test, &mock_clock, true); +} + +static void smp_cond_relaxed_timeout_expires(struct kunit *test) +{ + flag = 0; + test_smp_cond_relaxed_timeout(test, &basic_clock, false); +} + +static struct kunit_case barrier_timeout_test_cases[] = { + KUNIT_CASE(smp_cond_relaxed_timeout_mocked), + KUNIT_CASE(smp_cond_relaxed_timeout_succeeds), + KUNIT_CASE(smp_cond_relaxed_timeout_expires), + {} +}; + +static struct kunit_suite barrier_timeout_test_suite = { + .name = "smp-cond-load-relaxed-timeout", + .test_cases = barrier_timeout_test_cases, +}; + +kunit_test_suite(barrier_timeout_test_suite); + +MODULE_DESCRIPTION("KUnit tests for smp_cond_load_relaxed_timeout()"); +MODULE_LICENSE("GPL"); -- 2.31.1