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lib: add module support to string tests
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: 03270c1 ("lib/string.c: add testcases for memset16/32/64") Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Geert Uytterhoeven <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Shuah Khan <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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"); |