Eric Lee / smarc-fsl-linux-kernel

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mm/kmemleak-test.c 2.56 KB
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450515395   Thomas Gleixner   treewide: Replace... 
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  // SPDX-License-Identifier: GPL-2.0-only
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  /*
   * mm/kmemleak-test.c
   *
   * Copyright (C) 2008 ARM Limited
   * Written by Catalin Marinas <catalin.marinas@arm.com>
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   */
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  #define pr_fmt(fmt) "kmemleak: " fmt
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  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/slab.h>
  #include <linux/vmalloc.h>
  #include <linux/list.h>
  #include <linux/percpu.h>
  #include <linux/fdtable.h>
  
  #include <linux/kmemleak.h>
  
  struct test_node {
  	long header[25];
  	struct list_head list;
  	long footer[25];
  };
  
  static LIST_HEAD(test_list);
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  static DEFINE_PER_CPU(void *, kmemleak_test_pointer);
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  /*
   * Some very simple testing. This function needs to be extended for
   * proper testing.
   */
  static int __init kmemleak_test_init(void)
  {
  	struct test_node *elem;
  	int i;
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  	pr_info("Kmemleak testing
  ");
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  	/* make some orphan objects */
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  	pr_info("kmalloc(32) = %p
  ", kmalloc(32, GFP_KERNEL));
  	pr_info("kmalloc(32) = %p
  ", kmalloc(32, GFP_KERNEL));
  	pr_info("kmalloc(1024) = %p
  ", kmalloc(1024, GFP_KERNEL));
  	pr_info("kmalloc(1024) = %p
  ", kmalloc(1024, GFP_KERNEL));
  	pr_info("kmalloc(2048) = %p
  ", kmalloc(2048, GFP_KERNEL));
  	pr_info("kmalloc(2048) = %p
  ", kmalloc(2048, GFP_KERNEL));
  	pr_info("kmalloc(4096) = %p
  ", kmalloc(4096, GFP_KERNEL));
  	pr_info("kmalloc(4096) = %p
  ", kmalloc(4096, GFP_KERNEL));
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  #ifndef CONFIG_MODULES
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  	pr_info("kmem_cache_alloc(files_cachep) = %p
  ",
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  		kmem_cache_alloc(files_cachep, GFP_KERNEL));
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  	pr_info("kmem_cache_alloc(files_cachep) = %p
  ",
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  		kmem_cache_alloc(files_cachep, GFP_KERNEL));
  #endif
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  	pr_info("vmalloc(64) = %p
  ", vmalloc(64));
  	pr_info("vmalloc(64) = %p
  ", vmalloc(64));
  	pr_info("vmalloc(64) = %p
  ", vmalloc(64));
  	pr_info("vmalloc(64) = %p
  ", vmalloc(64));
  	pr_info("vmalloc(64) = %p
  ", vmalloc(64));
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  	/*
  	 * Add elements to a list. They should only appear as orphan
  	 * after the module is removed.
  	 */
  	for (i = 0; i < 10; i++) {
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  		elem = kzalloc(sizeof(*elem), GFP_KERNEL);
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  		pr_info("kzalloc(sizeof(*elem)) = %p
  ", elem);
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  		if (!elem)
  			return -ENOMEM;
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  		INIT_LIST_HEAD(&elem->list);
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  		list_add_tail(&elem->list, &test_list);
  	}
  
  	for_each_possible_cpu(i) {
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  		per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
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  		pr_info("kmalloc(129) = %p
  ",
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  			per_cpu(kmemleak_test_pointer, i));
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  	}
  
  	return 0;
  }
  module_init(kmemleak_test_init);
  
  static void __exit kmemleak_test_exit(void)
  {
  	struct test_node *elem, *tmp;
  
  	/*
  	 * Remove the list elements without actually freeing the
  	 * memory.
  	 */
  	list_for_each_entry_safe(elem, tmp, &test_list, list)
  		list_del(&elem->list);
  }
  module_exit(kmemleak_test_exit);
  
  MODULE_LICENSE("GPL");