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-rw-r--r--lib/Kconfig2
-rw-r--r--lib/Kconfig.debug19
-rw-r--r--lib/Makefile2
-rw-r--r--lib/bug.c25
-rw-r--r--lib/dma-debug.c20
-rw-r--r--lib/dynamic_debug.c4
-rw-r--r--lib/genalloc.c10
-rw-r--r--lib/int_sqrt.c7
-rw-r--r--lib/interval_tree_test.c4
-rw-r--r--lib/nmi_backtrace.c4
-rw-r--r--lib/rbtree_test.c2
-rw-r--r--lib/string.c141
-rw-r--r--lib/test_find_bit.c144
-rw-r--r--lib/test_kasan.c5
-rw-r--r--lib/test_kmod.c8
-rw-r--r--lib/test_list_sort.c9
-rw-r--r--lib/test_string.c141
17 files changed, 374 insertions, 173 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index a2b6745324ab..368972f0db78 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -584,7 +584,7 @@ config PRIME_NUMBERS
tristate
config STRING_SELFTEST
- bool "Test string functions"
+ tristate "Test string functions"
endmenu
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 8ffd891857ab..947d3e2ed5c2 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -756,6 +756,16 @@ config KCOV
For more details, see Documentation/dev-tools/kcov.rst.
+config KCOV_ENABLE_COMPARISONS
+ bool "Enable comparison operands collection by KCOV"
+ depends on KCOV
+ default n
+ help
+ KCOV also exposes operands of every comparison in the instrumented
+ code along with operand sizes and PCs of the comparison instructions.
+ These operands can be used by fuzzing engines to improve the quality
+ of fuzzing coverage.
+
config KCOV_INSTRUMENT_ALL
bool "Instrument all code by default"
depends on KCOV
@@ -1850,6 +1860,15 @@ config TEST_BPF
If unsure, say N.
+config TEST_FIND_BIT
+ tristate "Test find_bit functions"
+ default n
+ help
+ This builds the "test_find_bit" module that measure find_*_bit()
+ functions performance.
+
+ If unsure, say N.
+
config TEST_FIRMWARE
tristate "Test firmware loading via userspace interface"
default n
diff --git a/lib/Makefile b/lib/Makefile
index 136a0b254564..d11c48ec8ffd 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -40,12 +40,14 @@ obj-y += bcd.o div64.o sort.o parser.o debug_locks.o random32.o \
bsearch.o find_bit.o llist.o memweight.o kfifo.o \
percpu-refcount.o percpu_ida.o rhashtable.o reciprocal_div.o \
once.o refcount.o usercopy.o errseq.o
+obj-$(CONFIG_STRING_SELFTEST) += test_string.o
obj-y += string_helpers.o
obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o
obj-y += hexdump.o
obj-$(CONFIG_TEST_HEXDUMP) += test_hexdump.o
obj-y += kstrtox.o
obj-$(CONFIG_TEST_BPF) += test_bpf.o
+obj-$(CONFIG_TEST_FIND_BIT) += test_find_bit.o
obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
obj-$(CONFIG_TEST_HASH) += test_hash.o test_siphash.o
diff --git a/lib/bug.c b/lib/bug.c
index 1e094408c893..c1b0fad31b10 100644
--- a/lib/bug.c
+++ b/lib/bug.c
@@ -186,7 +186,7 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
return BUG_TRAP_TYPE_WARN;
}
- printk(KERN_DEFAULT "------------[ cut here ]------------\n");
+ printk(KERN_DEFAULT CUT_HERE);
if (file)
pr_crit("kernel BUG at %s:%u!\n", file, line);
@@ -196,3 +196,26 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
return BUG_TRAP_TYPE_BUG;
}
+
+static void clear_once_table(struct bug_entry *start, struct bug_entry *end)
+{
+ struct bug_entry *bug;
+
+ for (bug = start; bug < end; bug++)
+ bug->flags &= ~BUGFLAG_DONE;
+}
+
+void generic_bug_clear_once(void)
+{
+#ifdef CONFIG_MODULES
+ struct module *mod;
+
+ rcu_read_lock_sched();
+ list_for_each_entry_rcu(mod, &module_bug_list, bug_list)
+ clear_once_table(mod->bug_table,
+ mod->bug_table + mod->num_bugs);
+ rcu_read_unlock_sched();
+#endif
+
+ clear_once_table(__start___bug_table, __stop___bug_table);
+}
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index ea4cc3dde4f1..1b34d210452c 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -1495,14 +1495,22 @@ void debug_dma_alloc_coherent(struct device *dev, size_t size,
if (!entry)
return;
+ /* handle vmalloc and linear addresses */
+ if (!is_vmalloc_addr(virt) && !virt_to_page(virt))
+ return;
+
entry->type = dma_debug_coherent;
entry->dev = dev;
- entry->pfn = page_to_pfn(virt_to_page(virt));
entry->offset = offset_in_page(virt);
entry->size = size;
entry->dev_addr = dma_addr;
entry->direction = DMA_BIDIRECTIONAL;
+ if (is_vmalloc_addr(virt))
+ entry->pfn = vmalloc_to_pfn(virt);
+ else
+ entry->pfn = page_to_pfn(virt_to_page(virt));
+
add_dma_entry(entry);
}
EXPORT_SYMBOL(debug_dma_alloc_coherent);
@@ -1513,13 +1521,21 @@ void debug_dma_free_coherent(struct device *dev, size_t size,
struct dma_debug_entry ref = {
.type = dma_debug_coherent,
.dev = dev,
- .pfn = page_to_pfn(virt_to_page(virt)),
.offset = offset_in_page(virt),
.dev_addr = addr,
.size = size,
.direction = DMA_BIDIRECTIONAL,
};
+ /* handle vmalloc and linear addresses */
+ if (!is_vmalloc_addr(virt) && !virt_to_page(virt))
+ return;
+
+ if (is_vmalloc_addr(virt))
+ ref.pfn = vmalloc_to_pfn(virt);
+ else
+ ref.pfn = page_to_pfn(virt_to_page(virt));
+
if (unlikely(dma_debug_disabled()))
return;
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index da796e2dc4f5..c7c96bc7654a 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -360,6 +360,10 @@ static int ddebug_parse_query(char *words[], int nwords,
if (parse_lineno(last, &query->last_lineno) < 0)
return -EINVAL;
+ /* special case for last lineno not specified */
+ if (query->last_lineno == 0)
+ query->last_lineno = UINT_MAX;
+
if (query->last_lineno < query->first_lineno) {
pr_err("last-line:%d < 1st-line:%d\n",
query->last_lineno,
diff --git a/lib/genalloc.c b/lib/genalloc.c
index 144fe6b1a03e..ca06adc4f445 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -194,7 +194,7 @@ int gen_pool_add_virt(struct gen_pool *pool, unsigned long virt, phys_addr_t phy
chunk->phys_addr = phys;
chunk->start_addr = virt;
chunk->end_addr = virt + size - 1;
- atomic_set(&chunk->avail, size);
+ atomic_long_set(&chunk->avail, size);
spin_lock(&pool->lock);
list_add_rcu(&chunk->next_chunk, &pool->chunks);
@@ -304,7 +304,7 @@ unsigned long gen_pool_alloc_algo(struct gen_pool *pool, size_t size,
nbits = (size + (1UL << order) - 1) >> order;
rcu_read_lock();
list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) {
- if (size > atomic_read(&chunk->avail))
+ if (size > atomic_long_read(&chunk->avail))
continue;
start_bit = 0;
@@ -324,7 +324,7 @@ retry:
addr = chunk->start_addr + ((unsigned long)start_bit << order);
size = nbits << order;
- atomic_sub(size, &chunk->avail);
+ atomic_long_sub(size, &chunk->avail);
break;
}
rcu_read_unlock();
@@ -390,7 +390,7 @@ void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size)
remain = bitmap_clear_ll(chunk->bits, start_bit, nbits);
BUG_ON(remain);
size = nbits << order;
- atomic_add(size, &chunk->avail);
+ atomic_long_add(size, &chunk->avail);
rcu_read_unlock();
return;
}
@@ -464,7 +464,7 @@ size_t gen_pool_avail(struct gen_pool *pool)
rcu_read_lock();
list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk)
- avail += atomic_read(&chunk->avail);
+ avail += atomic_long_read(&chunk->avail);
rcu_read_unlock();
return avail;
}
diff --git a/lib/int_sqrt.c b/lib/int_sqrt.c
index db0b5aa071fc..e2d329099bf7 100644
--- a/lib/int_sqrt.c
+++ b/lib/int_sqrt.c
@@ -8,12 +8,13 @@
#include <linux/kernel.h>
#include <linux/export.h>
+#include <linux/bitops.h>
/**
- * int_sqrt - rough approximation to sqrt
+ * int_sqrt - computes the integer square root
* @x: integer of which to calculate the sqrt
*
- * A very rough approximation to the sqrt() function.
+ * Computes: floor(sqrt(x))
*/
unsigned long int_sqrt(unsigned long x)
{
@@ -22,7 +23,7 @@ unsigned long int_sqrt(unsigned long x)
if (x <= 1)
return x;
- m = 1UL << (BITS_PER_LONG - 2);
+ m = 1UL << (__fls(x) & ~1UL);
while (m != 0) {
b = y + m;
y >>= 1;
diff --git a/lib/interval_tree_test.c b/lib/interval_tree_test.c
index 0e343fd29570..835242e74aaa 100644
--- a/lib/interval_tree_test.c
+++ b/lib/interval_tree_test.c
@@ -11,10 +11,10 @@
MODULE_PARM_DESC(name, msg);
__param(int, nnodes, 100, "Number of nodes in the interval tree");
-__param(int, perf_loops, 100000, "Number of iterations modifying the tree");
+__param(int, perf_loops, 1000, "Number of iterations modifying the tree");
__param(int, nsearches, 100, "Number of searches to the interval tree");
-__param(int, search_loops, 10000, "Number of iterations searching the tree");
+__param(int, search_loops, 1000, "Number of iterations searching the tree");
__param(bool, search_all, false, "Searches will iterate all nodes in the tree");
__param(uint, max_endpoint, ~0, "Largest value for the interval's endpoint");
diff --git a/lib/nmi_backtrace.c b/lib/nmi_backtrace.c
index 46e4c749e4eb..61a6b5aab07e 100644
--- a/lib/nmi_backtrace.c
+++ b/lib/nmi_backtrace.c
@@ -93,8 +93,8 @@ bool nmi_cpu_backtrace(struct pt_regs *regs)
if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
arch_spin_lock(&lock);
if (regs && cpu_in_idle(instruction_pointer(regs))) {
- pr_warn("NMI backtrace for cpu %d skipped: idling at pc %#lx\n",
- cpu, instruction_pointer(regs));
+ pr_warn("NMI backtrace for cpu %d skipped: idling at %pS\n",
+ cpu, (void *)instruction_pointer(regs));
} else {
pr_warn("NMI backtrace for cpu %d\n", cpu);
if (regs)
diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c
index 191a238e5a9d..7d36c1e27ff6 100644
--- a/lib/rbtree_test.c
+++ b/lib/rbtree_test.c
@@ -11,7 +11,7 @@
MODULE_PARM_DESC(name, msg);
__param(int, nnodes, 100, "Number of nodes in the rb-tree");
-__param(int, perf_loops, 100000, "Number of iterations modifying the rb-tree");
+__param(int, perf_loops, 1000, "Number of iterations modifying the rb-tree");
__param(int, check_loops, 100, "Number of iterations modifying and verifying the rb-tree");
struct test_node {
diff --git a/lib/string.c b/lib/string.c
index 5e8d410a93df..64a9e33f1daa 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -1052,144 +1052,3 @@ void fortify_panic(const char *name)
BUG();
}
EXPORT_SYMBOL(fortify_panic);
-
-#ifdef CONFIG_STRING_SELFTEST
-#include <linux/slab.h>
-#include <linux/module.h>
-
-static __init int memset16_selftest(void)
-{
- unsigned i, j, k;
- u16 v, *p;
-
- p = kmalloc(256 * 2 * 2, GFP_KERNEL);
- if (!p)
- return -1;
-
- for (i = 0; i < 256; i++) {
- for (j = 0; j < 256; j++) {
- memset(p, 0xa1, 256 * 2 * sizeof(v));
- memset16(p + i, 0xb1b2, j);
- for (k = 0; k < 512; k++) {
- v = p[k];
- if (k < i) {
- if (v != 0xa1a1)
- goto fail;
- } else if (k < i + j) {
- if (v != 0xb1b2)
- goto fail;
- } else {
- if (v != 0xa1a1)
- goto fail;
- }
- }
- }
- }
-
-fail:
- kfree(p);
- if (i < 256)
- return (i << 24) | (j << 16) | k;
- return 0;
-}
-
-static __init int memset32_selftest(void)
-{
- unsigned i, j, k;
- u32 v, *p;
-
- p = kmalloc(256 * 2 * 4, GFP_KERNEL);
- if (!p)
- return -1;
-
- for (i = 0; i < 256; i++) {
- for (j = 0; j < 256; j++) {
- memset(p, 0xa1, 256 * 2 * sizeof(v));
- memset32(p + i, 0xb1b2b3b4, j);
- for (k = 0; k < 512; k++) {
- v = p[k];
- if (k < i) {
- if (v != 0xa1a1a1a1)
- goto fail;
- } else if (k < i + j) {
- if (v != 0xb1b2b3b4)
- goto fail;
- } else {
- if (v != 0xa1a1a1a1)
- goto fail;
- }
- }
- }
- }
-
-fail:
- kfree(p);
- if (i < 256)
- return (i << 24) | (j << 16) | k;
- return 0;
-}
-
-static __init int memset64_selftest(void)
-{
- unsigned i, j, k;
- u64 v, *p;
-
- p = kmalloc(256 * 2 * 8, GFP_KERNEL);
- if (!p)
- return -1;
-
- for (i = 0; i < 256; i++) {
- for (j = 0; j < 256; j++) {
- memset(p, 0xa1, 256 * 2 * sizeof(v));
- memset64(p + i, 0xb1b2b3b4b5b6b7b8ULL, j);
- for (k = 0; k < 512; k++) {
- v = p[k];
- if (k < i) {
- if (v != 0xa1a1a1a1a1a1a1a1ULL)
- goto fail;
- } else if (k < i + j) {
- if (v != 0xb1b2b3b4b5b6b7b8ULL)
- goto fail;
- } else {
- if (v != 0xa1a1a1a1a1a1a1a1ULL)
- goto fail;
- }
- }
- }
- }
-
-fail:
- kfree(p);
- if (i < 256)
- return (i << 24) | (j << 16) | k;
- return 0;
-}
-
-static __init int string_selftest_init(void)
-{
- int test, subtest;
-
- test = 1;
- subtest = memset16_selftest();
- if (subtest)
- goto fail;
-
- test = 2;
- subtest = memset32_selftest();
- if (subtest)
- goto fail;
-
- test = 3;
- subtest = memset64_selftest();
- if (subtest)
- goto fail;
-
- pr_info("String selftests succeeded\n");
- return 0;
-fail:
- pr_crit("String selftest failure %d.%08x\n", test, subtest);
- return 0;
-}
-
-module_init(string_selftest_init);
-#endif /* CONFIG_STRING_SELFTEST */
diff --git a/lib/test_find_bit.c b/lib/test_find_bit.c
new file mode 100644
index 000000000000..f4394a36f9aa
--- /dev/null
+++ b/lib/test_find_bit.c
@@ -0,0 +1,144 @@
+/*
+ * Test for find_*_bit functions.
+ *
+ * Copyright (c) 2017 Cavium.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License 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.
+ */
+
+/*
+ * find_bit functions are widely used in kernel, so the successful boot
+ * is good enough test for correctness.
+ *
+ * This test is focused on performance of traversing bitmaps. Two typical
+ * scenarios are reproduced:
+ * - randomly filled bitmap with approximately equal number of set and
+ * cleared bits;
+ * - sparse bitmap with few set bits at random positions.
+ */
+
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/random.h>
+
+#define BITMAP_LEN (4096UL * 8 * 10)
+#define SPARSE 500
+
+static DECLARE_BITMAP(bitmap, BITMAP_LEN) __initdata;
+
+/*
+ * This is Schlemiel the Painter's algorithm. It should be called after
+ * all other tests for the same bitmap because it sets all bits of bitmap to 1.
+ */
+static int __init test_find_first_bit(void *bitmap, unsigned long len)
+{
+ unsigned long i, cnt;
+ cycles_t cycles;
+
+ cycles = get_cycles();
+ for (cnt = i = 0; i < len; cnt++) {
+ i = find_first_bit(bitmap, len);
+ __clear_bit(i, bitmap);
+ }
+ cycles = get_cycles() - cycles;
+ pr_err("find_first_bit:\t\t%llu cycles,\t%ld iterations\n",
+ (u64)cycles, cnt);
+
+ return 0;
+}
+
+static int __init test_find_next_bit(const void *bitmap, unsigned long len)
+{
+ unsigned long i, cnt;
+ cycles_t cycles;
+
+ cycles = get_cycles();
+ for (cnt = i = 0; i < BITMAP_LEN; cnt++)
+ i = find_next_bit(bitmap, BITMAP_LEN, i) + 1;
+ cycles = get_cycles() - cycles;
+ pr_err("find_next_bit:\t\t%llu cycles,\t%ld iterations\n",
+ (u64)cycles, cnt);
+
+ return 0;
+}
+
+static int __init test_find_next_zero_bit(const void *bitmap, unsigned long len)
+{
+ unsigned long i, cnt;
+ cycles_t cycles;
+
+ cycles = get_cycles();
+ for (cnt = i = 0; i < BITMAP_LEN; cnt++)
+ i = find_next_zero_bit(bitmap, len, i) + 1;
+ cycles = get_cycles() - cycles;
+ pr_err("find_next_zero_bit:\t%llu cycles,\t%ld iterations\n",
+ (u64)cycles, cnt);
+
+ return 0;
+}
+
+static int __init test_find_last_bit(const void *bitmap, unsigned long len)
+{
+ unsigned long l, cnt = 0;
+ cycles_t cycles;
+
+ cycles = get_cycles();
+ do {
+ cnt++;
+ l = find_last_bit(bitmap, len);
+ if (l >= len)
+ break;
+ len = l;
+ } while (len);
+ cycles = get_cycles() - cycles;
+ pr_err("find_last_bit:\t\t%llu cycles,\t%ld iterations\n",
+ (u64)cycles, cnt);
+
+ return 0;
+}
+
+static int __init find_bit_test(void)
+{
+ unsigned long nbits = BITMAP_LEN / SPARSE;
+
+ pr_err("\nStart testing find_bit() with random-filled bitmap\n");
+
+ get_random_bytes(bitmap, sizeof(bitmap));
+
+ test_find_next_bit(bitmap, BITMAP_LEN);
+ test_find_next_zero_bit(bitmap, BITMAP_LEN);
+ test_find_last_bit(bitmap, BITMAP_LEN);
+ test_find_first_bit(bitmap, BITMAP_LEN);
+
+ pr_err("\nStart testing find_bit() with sparse bitmap\n");
+
+ bitmap_zero(bitmap, BITMAP_LEN);
+
+ while (nbits--)
+ __set_bit(prandom_u32() % BITMAP_LEN, bitmap);
+
+ test_find_next_bit(bitmap, BITMAP_LEN);
+ test_find_next_zero_bit(bitmap, BITMAP_LEN);
+ test_find_last_bit(bitmap, BITMAP_LEN);
+ test_find_first_bit(bitmap, BITMAP_LEN);
+
+ return 0;
+}
+module_init(find_bit_test);
+
+static void __exit test_find_bit_cleanup(void)
+{
+}
+module_exit(test_find_bit_cleanup);
+
+MODULE_LICENSE("GPL");
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index a25c9763fce1..ef1a3ac1397e 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -353,10 +353,9 @@ static noinline void __init memcg_accounted_kmem_cache(void)
*/
for (i = 0; i < 5; i++) {
p = kmem_cache_alloc(cache, GFP_KERNEL);
- if (!p) {
- pr_err("Allocation failed\n");
+ if (!p)
goto free_cache;
- }
+
kmem_cache_free(cache, p);
msleep(100);
}
diff --git a/lib/test_kmod.c b/lib/test_kmod.c
index fba78d25e825..337f408b4de6 100644
--- a/lib/test_kmod.c
+++ b/lib/test_kmod.c
@@ -783,10 +783,8 @@ static int kmod_config_sync_info(struct kmod_test_device *test_dev)
free_test_dev_info(test_dev);
test_dev->info = vzalloc(config->num_threads *
sizeof(struct kmod_test_device_info));
- if (!test_dev->info) {
- dev_err(test_dev->dev, "Cannot alloc test_dev info\n");
+ if (!test_dev->info)
return -ENOMEM;
- }
return 0;
}
@@ -1089,10 +1087,8 @@ static struct kmod_test_device *alloc_test_dev_kmod(int idx)
struct miscdevice *misc_dev;
test_dev = vzalloc(sizeof(struct kmod_test_device));
- if (!test_dev) {
- pr_err("Cannot alloc test_dev\n");
+ if (!test_dev)
goto err_out;
- }
mutex_init(&test_dev->config_mutex);
mutex_init(&test_dev->trigger_mutex);
diff --git a/lib/test_list_sort.c b/lib/test_list_sort.c
index 28e817387b04..5474f3f3e41d 100644
--- a/lib/test_list_sort.c
+++ b/lib/test_list_sort.c
@@ -76,17 +76,14 @@ static int __init list_sort_test(void)
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");
+ if (!elts)
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");
+ if (!el)
goto exit;
- }
+
/* force some equivalencies */
el->value = prandom_u32() % (TEST_LIST_LEN / 3);
el->serial = i;
diff --git a/lib/test_string.c b/lib/test_string.c
new file mode 100644
index 000000000000..0fcdb82dca86
--- /dev/null
+++ b/lib/test_string.c
@@ -0,0 +1,141 @@
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+static __init int memset16_selftest(void)
+{
+ unsigned i, j, k;
+ u16 v, *p;
+
+ p = kmalloc(256 * 2 * 2, GFP_KERNEL);
+ if (!p)
+ return -1;
+
+ for (i = 0; i < 256; i++) {
+ for (j = 0; j < 256; j++) {
+ memset(p, 0xa1, 256 * 2 * sizeof(v));
+ memset16(p + i, 0xb1b2, j);
+ for (k = 0; k < 512; k++) {
+ v = p[k];
+ if (k < i) {
+ if (v != 0xa1a1)
+ goto fail;
+ } else if (k < i + j) {
+ if (v != 0xb1b2)
+ goto fail;
+ } else {
+ if (v != 0xa1a1)
+ goto fail;
+ }
+ }
+ }
+ }
+
+fail:
+ kfree(p);
+ if (i < 256)
+ return (i << 24) | (j << 16) | k;
+ return 0;
+}
+
+static __init int memset32_selftest(void)
+{
+ unsigned i, j, k;
+ u32 v, *p;
+
+ p = kmalloc(256 * 2 * 4, GFP_KERNEL);
+ if (!p)
+ return -1;
+
+ for (i = 0; i < 256; i++) {
+ for (j = 0; j < 256; j++) {
+ memset(p, 0xa1, 256 * 2 * sizeof(v));
+ memset32(p + i, 0xb1b2b3b4, j);
+ for (k = 0; k < 512; k++) {
+ v = p[k];
+ if (k < i) {
+ if (v != 0xa1a1a1a1)
+ goto fail;
+ } else if (k < i + j) {
+ if (v != 0xb1b2b3b4)
+ goto fail;
+ } else {
+ if (v != 0xa1a1a1a1)
+ goto fail;
+ }
+ }
+ }
+ }
+
+fail:
+ kfree(p);
+ if (i < 256)
+ return (i << 24) | (j << 16) | k;
+ return 0;
+}
+
+static __init int memset64_selftest(void)
+{
+ unsigned i, j, k;
+ u64 v, *p;
+
+ p = kmalloc(256 * 2 * 8, GFP_KERNEL);
+ if (!p)
+ return -1;
+
+ for (i = 0; i < 256; i++) {
+ for (j = 0; j < 256; j++) {
+ memset(p, 0xa1, 256 * 2 * sizeof(v));
+ memset64(p + i, 0xb1b2b3b4b5b6b7b8ULL, j);
+ for (k = 0; k < 512; k++) {
+ v = p[k];
+ if (k < i) {
+ if (v != 0xa1a1a1a1a1a1a1a1ULL)
+ goto fail;
+ } else if (k < i + j) {
+ if (v != 0xb1b2b3b4b5b6b7b8ULL)
+ goto fail;
+ } else {
+ if (v != 0xa1a1a1a1a1a1a1a1ULL)
+ goto fail;
+ }
+ }
+ }
+ }
+
+fail:
+ kfree(p);
+ if (i < 256)
+ return (i << 24) | (j << 16) | k;
+ return 0;
+}
+
+static __init int string_selftest_init(void)
+{
+ int test, subtest;
+
+ test = 1;
+ subtest = memset16_selftest();
+ if (subtest)
+ goto fail;
+
+ test = 2;
+ subtest = memset32_selftest();
+ if (subtest)
+ goto fail;
+
+ test = 3;
+ subtest = memset64_selftest();
+ if (subtest)
+ goto fail;
+
+ pr_info("String selftests succeeded\n");
+ return 0;
+fail:
+ pr_crit("String selftest failure %d.%08x\n", test, subtest);
+ return 0;
+}
+
+module_init(string_selftest_init);
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 16:38:37 +0100