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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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