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lib: add module support to string tests

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Extract the string test code into its own source file, to allow
compiling it either to a loadable module, or built into the kernel.

Fixes: 03270c13c5 ("lib/string.c: add testcases for memset16/32/64")
Link: http://lkml.kernel.org/r/1505397744-3387-1-git-send-email-geert@linux-m68k.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Matthew Wilcox <mawilcox@microsoft.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>
This commit is contained in:
Geert Uytterhoeven 2017-11-17 15:27:56 -08:00 • committed by Linus Torvalds
parent f5bba9d11a
commit d6b28e0996
4 changed files with 143 additions and 142 deletions
Download patch file Download diff file Expand all files Collapse all files

141
lib/test_string.c Normal file
View file

@ -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");