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a=JfrnYn6hAAAA:8 a=dxJKRP51JkTsrzIwPSsA:9 a=Ytm653ucTKQjCvbzLygB:22 a=HkZW87K1Qel5hWWM3VKY:22 a=a-qgeE7W1pNrGK8U0ZQC:22 a=TPcZfFuj8SYsoCJAFAiX:22 a=1CNFftbPRP8L7MoqJWF3:22 a=5yU3S35YU4bGjq-dph-N:22 a=Bho9c0fBagfJEIQBS7DQ:22 cc=ntf awl=host:12298 X-Proofpoint-GUID: 3pUWIj6tmhy4CBgawQ2oA0OppMHSXxot X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260521_013126_079562_BE87A8F4 X-CRM114-Status: GOOD ( 19.32 ) 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 success and failure case tests for smp_cond_load_*_timeout(). All of the test cases wait on some state in smp_cond_load_*_timeout(). In the success case we spawn a kthread that pokes the bit. Success or failure cases depend on the expected bit being set (or not). Additionally in failure cases smp_cond_load_*_timeout() cannot return before timeout. Signed-off-by: Ankur Arora Cc: Andrew Morton Cc: Arnd Bergmann Cc: Boqun Feng Cc: Boqun Feng Cc: Catalin Marinas Cc: Christoph Lameter Cc: Haris Okanovic Cc: Ingo Molnar Cc: Konrad Dybcio Cc: Mark Brown Cc: Peter Zijlstra Cc: Will Deacon --- Note: This fixes an error in the test case reported by Mark Brown in https://lore.kernel.org/lkml/agr_RxvNtfASfevg@sirena.org.uk/. There are three changes over the old version: - One of the test conditions used in the test was much too strict. The test was treating success as implying that the smp_cond_load_relaxed_timeout() call has to return before timeout. (runtime <= timeout_ns). However, all that we know is that on failure (!success), the smp_cond_load_relaxed_timeout() *cannot* return before timeout. (runtime >= timeout_ns). - The test can run in a wide variety of environments including in emulation. So to reduce the chance of failure due to timing, remove the kthreaded case. - Parametrize the test cases. --- lib/Kconfig.debug | 10 +++ lib/tests/Makefile | 1 + lib/tests/barrier-timeout-test.c | 128 +++++++++++++++++++++++++++++++ 3 files changed, 139 insertions(+) create mode 100644 lib/tests/barrier-timeout-test.c diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index ce25724be414..9d54c48d7d98 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2413,6 +2413,16 @@ 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 7e9c2fa52e35..19c1d6b17856 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..2160844b27b8 --- /dev/null +++ b/lib/tests/barrier-timeout-test.c @@ -0,0 +1,128 @@ +// 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 + +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 mocked_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 *); +struct smp_cond_update_params { + clkfn_t clock; + bool acquire; + bool succeeds; +}; + +static const struct smp_cond_update_params update_params_list[] = { + /* mocked-clock updates flag inline. */ + { .clock = &mocked_clock, .succeeds=true, .acquire=false, }, + { .clock = &mocked_clock, .succeeds=true, .acquire=true, }, + + /* basic-clock doesn't update flag. */ + { .clock = &basic_clock, .succeeds=false, .acquire=true, }, + { .clock = &basic_clock, .succeeds=false, .acquire=false, }, +}; + +static void param_to_desc(const struct smp_cond_update_params *p, char *desc) +{ + char *clk, *update; + + if (p->clock == &mocked_clock) { + clk = "mocked"; + update = "inline"; + } else if (p->clock == &basic_clock) { + clk = "basic"; + update = "none"; + } + + + snprintf(desc, KUNIT_PARAM_DESC_SIZE, "smp_cond_%s_timeout: clock-%s, update=%s", + p->acquire ? "acquire": "relaxed", clk, update); +} + +KUNIT_ARRAY_PARAM(smp_cond_update_params, update_params_list, param_to_desc); + + +static void test_smp_cond_timeout(struct kunit *test) +{ + const struct smp_cond_update_params *p = test->param_value; + struct clock_state clk = { + .start_time = local_clock(), + .end_time = local_clock(), + }; + s64 runtime, timeout_ns = TIMEOUT_MSEC * NSEC_PER_MSEC; + unsigned int result; + + flag = 0; + if (p->acquire) { + result = smp_cond_load_acquire_timeout(&flag, + (VAL & TEST_FLAG_VAL), + p->clock(&clk), + timeout_ns); + } else { + result = smp_cond_load_relaxed_timeout(&flag, + (VAL & TEST_FLAG_VAL), + p->clock(&clk), + timeout_ns); + } + + runtime = clk.end_time - clk.start_time; + KUNIT_EXPECT_EQ(test, (bool)(result & TEST_FLAG_VAL), p->succeeds); + if (!p->succeeds) + KUNIT_EXPECT_GE(test, runtime, timeout_ns); +} + +static struct kunit_case barrier_timeout_test_cases[] = { + KUNIT_CASE_PARAM(test_smp_cond_timeout, smp_cond_update_params_gen_params), + {} +}; + +static struct kunit_suite barrier_timeout_test_suite = { + .name = "smp-cond-load-*-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"); -- 2.43.7