Eric Lee / smarc-fsl-linux-kernel

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mm/kmemleak-test.c 3.15 KB
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81f7e3824   Eric Lee   Initial Release, ... 
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  /*
   * mm/kmemleak-test.c
   *
   * Copyright (C) 2008 ARM Limited
   * Written by Catalin Marinas <catalin.marinas@arm.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */
  
  #define pr_fmt(fmt) "kmemleak: " fmt
  
  #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);
  static DEFINE_PER_CPU(void *, kmemleak_test_pointer);
  
  /*
   * 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;
  
  	pr_info("Kmemleak testing
  ");
  
  	/* make some orphan objects */
  	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));
  #ifndef CONFIG_MODULES
  	pr_info("kmem_cache_alloc(files_cachep) = %p
  ",
  		kmem_cache_alloc(files_cachep, GFP_KERNEL));
  	pr_info("kmem_cache_alloc(files_cachep) = %p
  ",
  		kmem_cache_alloc(files_cachep, GFP_KERNEL));
  #endif
  	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));
  
  	/*
  	 * Add elements to a list. They should only appear as orphan
  	 * after the module is removed.
  	 */
  	for (i = 0; i < 10; i++) {
  		elem = kzalloc(sizeof(*elem), GFP_KERNEL);
  		pr_info("kzalloc(sizeof(*elem)) = %p
  ", elem);
  		if (!elem)
  			return -ENOMEM;
  		INIT_LIST_HEAD(&elem->list);
  		list_add_tail(&elem->list, &test_list);
  	}
  
  	for_each_possible_cpu(i) {
  		per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
  		pr_info("kmalloc(129) = %p
  ",
  			per_cpu(kmemleak_test_pointer, i));
  	}
  
  	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");