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author | Geert Uytterhoeven <geert@linux-m68k.org> | 2017-05-08 15:55:26 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-08 17:15:10 -0700 |
commit | e327fd7c86678ba22d2b7cd25f6ceef1ffe29c8a (patch) | |
tree | d224eec1bee8c99031ef39b9cefe2a5d6b320e47 /lib | |
parent | 5c4e679898eabca844059743c05253cf33b90e94 (diff) | |
download | lwn-e327fd7c86678ba22d2b7cd25f6ceef1ffe29c8a.tar.gz lwn-e327fd7c86678ba22d2b7cd25f6ceef1ffe29c8a.zip |
lib: add module support to linked list sorting tests
Extract the linked list sorting test code into its own source file, to
allow to compile it either to a loadable module, or builtin into the
kernel.
Link: http://lkml.kernel.org/r/1488287219-15832-4-git-send-email-geert@linux-m68k.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r-- | lib/Kconfig.debug | 7 | ||||
-rw-r--r-- | lib/Makefile | 1 | ||||
-rw-r--r-- | lib/list_sort.c | 149 | ||||
-rw-r--r-- | lib/test_list_sort.c | 150 |
4 files changed, 155 insertions, 152 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index de3f7c151320..e4587ebe52c7 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1719,11 +1719,12 @@ config LKDTM Documentation/fault-injection/provoke-crashes.txt config TEST_LIST_SORT - bool "Linked list sorting test" - depends on DEBUG_KERNEL + tristate "Linked list sorting test" + depends on DEBUG_KERNEL || m help Enable this to turn on 'list_sort()' function test. This test is - executed only once during system boot, so affects only boot time. + executed only once during system boot (so affects only boot time), + or at module load time. If unsure, say N. diff --git a/lib/Makefile b/lib/Makefile index a155c73e3437..0166fbc0fa81 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -52,6 +52,7 @@ obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o obj-$(CONFIG_TEST_HASH) += test_hash.o test_siphash.o obj-$(CONFIG_TEST_KASAN) += test_kasan.o obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o +obj-$(CONFIG_TEST_LIST_SORT) += test_list_sort.o obj-$(CONFIG_TEST_LKM) += test_module.o obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o obj-$(CONFIG_TEST_SORT) += test_sort.o diff --git a/lib/list_sort.c b/lib/list_sort.c index 3fe401067e20..9e9acc37652f 100644 --- a/lib/list_sort.c +++ b/lib/list_sort.c @@ -1,6 +1,3 @@ - -#define pr_fmt(fmt) "list_sort_test: " fmt - #include <linux/kernel.h> #include <linux/bug.h> #include <linux/compiler.h> @@ -145,149 +142,3 @@ void list_sort(void *priv, struct list_head *head, merge_and_restore_back_links(priv, cmp, head, part[max_lev], list); } EXPORT_SYMBOL(list_sort); - -#ifdef CONFIG_TEST_LIST_SORT - -#include <linux/slab.h> -#include <linux/random.h> - -/* - * The pattern of set bits in the list length determines which cases - * are hit in list_sort(). - */ -#define TEST_LIST_LEN (512+128+2) /* not including head */ - -#define TEST_POISON1 0xDEADBEEF -#define TEST_POISON2 0xA324354C - -struct debug_el { - unsigned int poison1; - struct list_head list; - unsigned int poison2; - int value; - unsigned serial; -}; - -/* Array, containing pointers to all elements in the test list */ -static struct debug_el **elts __initdata; - -static int __init check(struct debug_el *ela, struct debug_el *elb) -{ - if (ela->serial >= TEST_LIST_LEN) { - pr_err("error: incorrect serial %d\n", ela->serial); - return -EINVAL; - } - if (elb->serial >= TEST_LIST_LEN) { - pr_err("error: incorrect serial %d\n", elb->serial); - return -EINVAL; - } - if (elts[ela->serial] != ela || elts[elb->serial] != elb) { - pr_err("error: phantom element\n"); - return -EINVAL; - } - if (ela->poison1 != TEST_POISON1 || ela->poison2 != TEST_POISON2) { - pr_err("error: bad poison: %#x/%#x\n", - ela->poison1, ela->poison2); - return -EINVAL; - } - if (elb->poison1 != TEST_POISON1 || elb->poison2 != TEST_POISON2) { - pr_err("error: bad poison: %#x/%#x\n", - elb->poison1, elb->poison2); - return -EINVAL; - } - return 0; -} - -static int __init cmp(void *priv, struct list_head *a, struct list_head *b) -{ - struct debug_el *ela, *elb; - - ela = container_of(a, struct debug_el, list); - elb = container_of(b, struct debug_el, list); - - check(ela, elb); - return ela->value - elb->value; -} - -static int __init list_sort_test(void) -{ - int i, count = 1, err = -ENOMEM; - struct debug_el *el; - struct list_head *cur; - LIST_HEAD(head); - - pr_debug("start testing list_sort()\n"); - - elts = kcalloc(TEST_LIST_LEN, sizeof(*elts), GFP_KERNEL); - if (!elts) { - pr_err("error: cannot allocate memory\n"); - return err; - } - - for (i = 0; i < TEST_LIST_LEN; i++) { - el = kmalloc(sizeof(*el), GFP_KERNEL); - if (!el) { - pr_err("error: cannot allocate memory\n"); - goto exit; - } - /* force some equivalencies */ - el->value = prandom_u32() % (TEST_LIST_LEN / 3); - el->serial = i; - el->poison1 = TEST_POISON1; - el->poison2 = TEST_POISON2; - elts[i] = el; - list_add_tail(&el->list, &head); - } - - list_sort(NULL, &head, cmp); - - err = -EINVAL; - for (cur = head.next; cur->next != &head; cur = cur->next) { - struct debug_el *el1; - int cmp_result; - - if (cur->next->prev != cur) { - pr_err("error: list is corrupted\n"); - goto exit; - } - - cmp_result = cmp(NULL, cur, cur->next); - if (cmp_result > 0) { - pr_err("error: list is not sorted\n"); - goto exit; - } - - el = container_of(cur, struct debug_el, list); - el1 = container_of(cur->next, struct debug_el, list); - if (cmp_result == 0 && el->serial >= el1->serial) { - pr_err("error: order of equivalent elements not " - "preserved\n"); - goto exit; - } - - if (check(el, el1)) { - pr_err("error: element check failed\n"); - goto exit; - } - count++; - } - if (head.prev != cur) { - pr_err("error: list is corrupted\n"); - goto exit; - } - - - if (count != TEST_LIST_LEN) { - pr_err("error: bad list length %d", count); - goto exit; - } - - err = 0; -exit: - for (i = 0; i < TEST_LIST_LEN; i++) - kfree(elts[i]); - kfree(elts); - return err; -} -late_initcall(list_sort_test); -#endif /* CONFIG_TEST_LIST_SORT */ diff --git a/lib/test_list_sort.c b/lib/test_list_sort.c new file mode 100644 index 000000000000..28e817387b04 --- /dev/null +++ b/lib/test_list_sort.c @@ -0,0 +1,150 @@ +#define pr_fmt(fmt) "list_sort_test: " fmt + +#include <linux/kernel.h> +#include <linux/list_sort.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/printk.h> +#include <linux/slab.h> +#include <linux/random.h> + +/* + * The pattern of set bits in the list length determines which cases + * are hit in list_sort(). + */ +#define TEST_LIST_LEN (512+128+2) /* not including head */ + +#define TEST_POISON1 0xDEADBEEF +#define TEST_POISON2 0xA324354C + +struct debug_el { + unsigned int poison1; + struct list_head list; + unsigned int poison2; + int value; + unsigned serial; +}; + +/* Array, containing pointers to all elements in the test list */ +static struct debug_el **elts __initdata; + +static int __init check(struct debug_el *ela, struct debug_el *elb) +{ + if (ela->serial >= TEST_LIST_LEN) { + pr_err("error: incorrect serial %d\n", ela->serial); + return -EINVAL; + } + if (elb->serial >= TEST_LIST_LEN) { + pr_err("error: incorrect serial %d\n", elb->serial); + return -EINVAL; + } + if (elts[ela->serial] != ela || elts[elb->serial] != elb) { + pr_err("error: phantom element\n"); + return -EINVAL; + } + if (ela->poison1 != TEST_POISON1 || ela->poison2 != TEST_POISON2) { + pr_err("error: bad poison: %#x/%#x\n", + ela->poison1, ela->poison2); + return -EINVAL; + } + if (elb->poison1 != TEST_POISON1 || elb->poison2 != TEST_POISON2) { + pr_err("error: bad poison: %#x/%#x\n", + elb->poison1, elb->poison2); + return -EINVAL; + } + return 0; +} + +static int __init cmp(void *priv, struct list_head *a, struct list_head *b) +{ + struct debug_el *ela, *elb; + + ela = container_of(a, struct debug_el, list); + elb = container_of(b, struct debug_el, list); + + check(ela, elb); + return ela->value - elb->value; +} + +static int __init list_sort_test(void) +{ + int i, count = 1, err = -ENOMEM; + struct debug_el *el; + struct list_head *cur; + LIST_HEAD(head); + + pr_debug("start testing list_sort()\n"); + + elts = kcalloc(TEST_LIST_LEN, sizeof(*elts), GFP_KERNEL); + if (!elts) { + pr_err("error: cannot allocate memory\n"); + return err; + } + + for (i = 0; i < TEST_LIST_LEN; i++) { + el = kmalloc(sizeof(*el), GFP_KERNEL); + if (!el) { + pr_err("error: cannot allocate memory\n"); + goto exit; + } + /* force some equivalencies */ + el->value = prandom_u32() % (TEST_LIST_LEN / 3); + el->serial = i; + el->poison1 = TEST_POISON1; + el->poison2 = TEST_POISON2; + elts[i] = el; + list_add_tail(&el->list, &head); + } + + list_sort(NULL, &head, cmp); + + err = -EINVAL; + for (cur = head.next; cur->next != &head; cur = cur->next) { + struct debug_el *el1; + int cmp_result; + + if (cur->next->prev != cur) { + pr_err("error: list is corrupted\n"); + goto exit; + } + + cmp_result = cmp(NULL, cur, cur->next); + if (cmp_result > 0) { + pr_err("error: list is not sorted\n"); + goto exit; + } + + el = container_of(cur, struct debug_el, list); + el1 = container_of(cur->next, struct debug_el, list); + if (cmp_result == 0 && el->serial >= el1->serial) { + pr_err("error: order of equivalent elements not " + "preserved\n"); + goto exit; + } + + if (check(el, el1)) { + pr_err("error: element check failed\n"); + goto exit; + } + count++; + } + if (head.prev != cur) { + pr_err("error: list is corrupted\n"); + goto exit; + } + + + if (count != TEST_LIST_LEN) { + pr_err("error: bad list length %d", count); + goto exit; + } + + err = 0; +exit: + for (i = 0; i < TEST_LIST_LEN; i++) + kfree(elts[i]); + kfree(elts); + return err; +} +module_init(list_sort_test); +MODULE_LICENSE("GPL"); |