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    Subject[PATCH 09/10] Simple testing for kmemleak
    Date
    From: Catalin Marinas <catalin.marinas@arm.com>

    This patch only contains some very simple testing at the moment. Proper
    testing will be needed.

    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    ---

    lib/Kconfig.debug | 9 ++++++
    mm/Makefile | 1 +
    mm/memleak-test.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 93 insertions(+), 0 deletions(-)

    diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
    index 5013375..5240d62 100644
    --- a/lib/Kconfig.debug
    +++ b/lib/Kconfig.debug
    @@ -181,6 +181,15 @@ config DEBUG_KEEP_INIT
    kernel initialization. It is useful for identifying memory
    leaks happening during the kernel or modules initialization.

    +config DEBUG_MEMLEAK_TEST
    + tristate "Test the kernel memory leak detector"
    + default n
    + depends on DEBUG_MEMLEAK
    + help
    + Say Y here to build the test harness for the kernel memory
    + leak detector. At the moment, this option enables a module
    + that explicitly leaks memory.
    +
    config DEBUG_PREEMPT
    bool "Debug preemptible kernel"
    depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT
    diff --git a/mm/Makefile b/mm/Makefile
    index edccbc0..fd46a73 100644
    --- a/mm/Makefile
    +++ b/mm/Makefile
    @@ -24,3 +24,4 @@ obj-$(CONFIG_MEMORY_HOTPLUG) += memory_h
    obj-$(CONFIG_FS_XIP) += filemap_xip.o
    obj-$(CONFIG_MIGRATION) += migrate.o
    obj-$(CONFIG_DEBUG_MEMLEAK) += memleak.o
    +obj-$(CONFIG_DEBUG_MEMLEAK_TEST) += memleak-test.o
    diff --git a/mm/memleak-test.c b/mm/memleak-test.c
    new file mode 100644
    index 0000000..4061f99
    --- /dev/null
    +++ b/mm/memleak-test.c
    @@ -0,0 +1,83 @@
    +/*
    + * mm/memleak-test.c
    + *
    + * Copyright (C) 2006 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
    + */
    +
    +#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/memleak.h>
    +
    +struct test_node {
    + long header[25];
    + struct list_head list;
    + long footer[25];
    +};
    +
    +static LIST_HEAD(test_list);
    +
    +/* Some very simple testing. This function needs to be extended for
    + * proper testing */
    +static int __init memleak_test_init(void)
    +{
    + struct test_node *elem;
    + int i;
    +
    + printk(KERN_INFO "KMemLeak testing\n");
    +
    + /* make some orphan pointers */
    + kmalloc(32, GFP_KERNEL);
    + kmalloc(32, GFP_KERNEL);
    +#ifndef CONFIG_MODULES
    + kmem_cache_alloc(files_cachep, GFP_KERNEL);
    + kmem_cache_alloc(files_cachep, GFP_KERNEL);
    +#endif
    + vmalloc(64);
    + 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 = kmalloc(sizeof(*elem), GFP_KERNEL);
    + if (!elem)
    + return -ENOMEM;
    + memset(elem, 0, sizeof(*elem));
    + INIT_LIST_HEAD(&elem->list);
    +
    + list_add_tail(&elem->list, &test_list);
    + }
    +
    + return 0;
    +}
    +module_init(memleak_test_init);
    +
    +static void __exit memleak_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(memleak_test_exit);
    +
    +MODULE_LICENSE("GPL");
    -
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