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: 03270c13c5ffaa6a ("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>

1 files changed, 0 insertions, 141 deletions

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 */