Created
May 3, 2017 10:21
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refcount api test
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| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
| #include <linux/module.h> | |
| #include <linux/kernel.h> | |
| #include <linux/refcount.h> | |
| #include <linux/smp.h> | |
| #include <linux/slab.h> | |
| MODULE_DESCRIPTION("refcount api test"); | |
| MODULE_AUTHOR("masami256"); | |
| MODULE_LICENSE("GPL"); | |
| static refcount_t counter1 = REFCOUNT_INIT(1); | |
| static refcount_t *counter2; | |
| static int non_atomic_counter; | |
| static void refcounter_test_run(void *info) | |
| { | |
| pr_info("%s: cpu %d\n", __func__, smp_processor_id()); | |
| refcount_inc(&counter1); | |
| refcount_inc(counter2); | |
| non_atomic_counter++; | |
| } | |
| static int refcounter_test_init(void) | |
| { | |
| pr_info("%s start\n", __func__); | |
| counter2 = kmalloc(sizeof(refcount_t), GFP_KERNEL); | |
| if (!counter2) | |
| return -ENOMEM; | |
| refcount_set(counter2, 1); | |
| on_each_cpu(&refcounter_test_run, NULL, 1); | |
| pr_info("counter1: %d\n", refcount_read(&counter1)); | |
| pr_info("counter2: %d\n", refcount_read(counter2)); | |
| pr_info("non_atomic_counter: %d\n", non_atomic_counter); | |
| return 0; | |
| } | |
| static void refcounter_test_cleanup(void) | |
| { | |
| pr_info("%s bye\n", __func__); | |
| kfree(counter2); | |
| } | |
| module_init(refcounter_test_init); | |
| module_exit(refcounter_test_cleanup); |
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