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h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jTMRjFLThSMMc/w3StUWqu1LpTWLAsUOncWy0PHshAk=; b=xQS5CzkIcPO109Cb+436Qqh/cxYj3inN1re6Kjq5Boj4l3I1jsOvvNNKHFxwTEa+mnx5YT x8s+MjZu0OWymu98RI9/82lzQcCq+5xcpxjoM2ziXjyF6FhkJm3vslJ/Mr9rBm1jxMMFPU HNfDwHkPmKwNzJbuXSzQeUPfgKjbDHpJwAQjzOPGqB125yBnQ8tJzMcSotAA5FcPRnveHW OiUDYFDo4YJIFn8+mfHqQu+E79pWcbroR1NktHv5qvX+TePUiUdc+DeZRB4PB+1v0Uycg6 gp3BlzM4yye6JXSBRrlw7mUXCkB4wqZLmBCPZQBorRKi0smgiPiRAjT310k3xA== From: Eugene Mavick Date: Sat, 01 Aug 2026 18:59:44 +0800 Subject: [PATCH v4 4/5] kunit: add test for ref_trace_final_put MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260801-refcount-final-put-trace-v4-4-2e58678f0ffd@mavick.dev> References: <20260801-refcount-final-put-trace-v4-0-2e58678f0ffd@mavick.dev> In-Reply-To: <20260801-refcount-final-put-trace-v4-0-2e58678f0ffd@mavick.dev> To: Will Deacon , Peter Zijlstra , Boqun Feng , Mark Rutland , Gary Guo , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Andrew Morton , Dennis Zhou , Tejun Heo , Christoph Lameter Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, Eugene Mavick X-Developer-Signature: v=1; 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The test registers a probe function and triggers both refcount_t and percpu_ref final put paths, verifying that the tracepoint fires correctly and that the recorded fields match expected values. Signed-off-by: Eugene Mavick --- lib/Kconfig | 10 ++++ lib/tests/Makefile | 1 + lib/tests/ref_trace_kunit.c | 141 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 152 insertions(+) diff --git a/lib/Kconfig b/lib/Kconfig index 00a9509636c1..7e2746be6d16 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -52,6 +52,16 @@ config PACKING_KUNIT_TEST When in doubt, say N. +config REF_TRACE_KUNIT_TEST + bool "ref_trace kunit test" if !KUNIT_ALL_TESTS + depends on KUNIT && TRACEPOINTS + default KUNIT_ALL_TESTS + help + This option enables the KUnit test suite for the ref_trace_final_put + tracepoint. + + If unsure, say N. + config BITREVERSE tristate diff --git a/lib/tests/Makefile b/lib/tests/Makefile index 7e9c2fa52e35..828a030ad8c7 100644 --- a/lib/tests/Makefile +++ b/lib/tests/Makefile @@ -57,5 +57,6 @@ obj-$(CONFIG_USERCOPY_KUNIT_TEST) += usercopy_kunit.o obj-$(CONFIG_UTIL_MACROS_KUNIT) += util_macros_kunit.o obj-$(CONFIG_RATELIMIT_KUNIT_TEST) += test_ratelimit.o obj-$(CONFIG_UUID_KUNIT_TEST) += uuid_kunit.o +obj-$(CONFIG_REF_TRACE_KUNIT_TEST) += ref_trace_kunit.o obj-$(CONFIG_TEST_RUNTIME_MODULE) += module/ diff --git a/lib/tests/ref_trace_kunit.c b/lib/tests/ref_trace_kunit.c new file mode 100644 index 000000000000..17f6936ecc1a --- /dev/null +++ b/lib/tests/ref_trace_kunit.c @@ -0,0 +1,141 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct data { + unsigned long caller; + unsigned long ip; + const void *obj; + atomic_t count; +}; + +struct data capture; + +const void *chk_obj; + +#define test_init() \ + do { \ + KUNIT_EXPECT_FALSE( \ + test, register_trace_ref_trace_final_put(probe, NULL)); \ + \ + atomic_set_release(&capture.count, 0); \ + \ + chk_obj = &obj; \ + } while (0) + + +#define test_exit() \ + do { \ + /* wait for probe completion */ \ + int notimeout = wait_var_event_timeout( \ + &capture.count, \ + atomic_read_acquire(&capture.count), \ + msecs_to_jiffies(10000) \ + ); \ + \ + unregister_trace_ref_trace_final_put(probe, NULL); \ + tracepoint_synchronize_unregister(); \ + \ + KUNIT_ASSERT_TRUE(test, notimeout); \ + \ + KUNIT_EXPECT_EQ(test, atomic_read_acquire(&capture.count), 1); \ + \ + KUNIT_EXPECT_TRUE(test, __kernel_text_address(capture.caller)); \ + KUNIT_EXPECT_TRUE(test, __kernel_text_address(capture.ip)); \ + \ + KUNIT_EXPECT_PTR_EQ(test, capture.obj, &obj); \ + } while (0) + +static void probe( + void *ignore, + unsigned long caller, + unsigned long ip, + const void *obj) +{ + //prevent non test func final_puts from changing captured values + if (chk_obj != obj) + return; + + capture.caller = caller; + capture.ip = ip; + capture.obj = obj; + + atomic_inc_return_release(&capture.count); //increase count +} + +static void test_refcount_sub_and_test(struct kunit *test) +{ + refcount_t obj; + + test_init(); + refcount_set(&obj, 2); + + KUNIT_EXPECT_FALSE(test, refcount_dec_and_test(&obj)); + KUNIT_EXPECT_TRUE(test, refcount_dec_and_test(&obj)); + + test_exit(); +} + +static void test_refcount_dec_if_one(struct kunit *test) +{ + refcount_t obj; + + test_init(); + refcount_set(&obj, 2); + + KUNIT_EXPECT_FALSE(test, refcount_dec_and_test(&obj)); + KUNIT_EXPECT_TRUE(test, refcount_dec_if_one(&obj)); + + test_exit(); +} +static void dummy_release(struct percpu_ref *ref) {} + +static void test_percpu_ref_put_many(struct kunit *test) +{ + struct percpu_ref obj; + + test_init(); + + KUNIT_ASSERT_FALSE(test, percpu_ref_init(&obj, dummy_release, 0, GFP_KERNEL)); + + percpu_ref_get(&obj); + percpu_ref_get(&obj); + + percpu_ref_put(&obj); + percpu_ref_put(&obj); + + percpu_ref_switch_to_atomic_sync(&obj); + + percpu_ref_put(&obj); + + test_exit(); + percpu_ref_exit(&obj); +} + +static struct kunit_case __refdata ref_trace_test_cases[] = { + KUNIT_CASE(test_refcount_sub_and_test), + KUNIT_CASE(test_refcount_dec_if_one), + KUNIT_CASE(test_percpu_ref_put_many), + {} +}; + +static struct kunit_suite ref_trace_test_suite = { + .name = "ref-trace", + .test_cases = ref_trace_test_cases +}; + +kunit_test_suites(&ref_trace_test_suite); + +MODULE_AUTHOR("Eugene Mavick "); +MODULE_DESCRIPTION("KUnit test for ref_trace"); +MODULE_LICENSE("GPL"); -- 2.51.2