From 1abbef4f51724fb11f09adf0e75275f7cb422a8a Mon Sep 17 00:00:00 2001 From: Hui Su Date: Tue, 13 Oct 2020 16:48:53 -0700 Subject: mm,kmemleak-test.c: move kmemleak-test.c to samples dir kmemleak-test.c is just a kmemleak test module, which also can not be used as a built-in kernel module. Thus, i think it may should not be in mm dir, and move the kmemleak-test.c to samples/kmemleak/kmemleak-test.c. Fix the spelling of built-in by the way. Signed-off-by: Hui Su Signed-off-by: Andrew Morton Cc: Catalin Marinas Cc: Jonathan Corbet Cc: Mauro Carvalho Chehab Cc: David S. Miller Cc: Rob Herring Cc: Masahiro Yamada Cc: Sam Ravnborg Cc: Josh Poimboeuf Cc: Steven Rostedt (VMware) Cc: Miguel Ojeda Cc: Divya Indi Cc: Tomas Winkler Cc: David Howells Link: https://lkml.kernel.org/r/20200925183729.GA172837@rlk Signed-off-by: Linus Torvalds --- samples/kmemleak/Makefile | 3 ++ samples/kmemleak/kmemleak-test.c | 99 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 102 insertions(+) create mode 100644 samples/kmemleak/Makefile create mode 100644 samples/kmemleak/kmemleak-test.c (limited to 'samples/kmemleak') diff --git a/samples/kmemleak/Makefile b/samples/kmemleak/Makefile new file mode 100644 index 000000000000..16b6132c540c --- /dev/null +++ b/samples/kmemleak/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only + +obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak-test.o diff --git a/samples/kmemleak/kmemleak-test.c b/samples/kmemleak/kmemleak-test.c new file mode 100644 index 000000000000..7b476eb8285f --- /dev/null +++ b/samples/kmemleak/kmemleak-test.c @@ -0,0 +1,99 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * samples/kmemleak/kmemleak-test.c + * + * Copyright (C) 2008 ARM Limited + * Written by Catalin Marinas + */ + +#define pr_fmt(fmt) "kmemleak: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +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\n"); + + /* make some orphan objects */ + pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); + pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); + pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); + pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); + pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); + pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); + pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); + pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); +#ifndef CONFIG_MODULES + pr_info("kmem_cache_alloc(files_cachep) = %p\n", + kmem_cache_alloc(files_cachep, GFP_KERNEL)); + pr_info("kmem_cache_alloc(files_cachep) = %p\n", + kmem_cache_alloc(files_cachep, GFP_KERNEL)); +#endif + pr_info("vmalloc(64) = %p\n", vmalloc(64)); + pr_info("vmalloc(64) = %p\n", vmalloc(64)); + pr_info("vmalloc(64) = %p\n", vmalloc(64)); + pr_info("vmalloc(64) = %p\n", vmalloc(64)); + pr_info("vmalloc(64) = %p\n", 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\n", 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\n", + 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"); -- cgit v1.2.3