lib/test_bitmap.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Test cases for bitmap API.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/bitmap.h>
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/printk.h>
  13 #include <linux/slab.h>
  14 #include <linux/string.h>
  15 #include <linux/uaccess.h>
  16
  17 #include "../tools/testing/selftests/kselftest_module.h"
  18
  19 KSTM_MODULE_GLOBALS();
  20
  21 static char pbl_buffer[PAGE_SIZE] __initdata;
  22
  23 static const unsigned long exp1[] __initconst = {
  24         BITMAP_FROM_U64(1),
  25         BITMAP_FROM_U64(2),
  26         BITMAP_FROM_U64(0x0000ffff),
  27         BITMAP_FROM_U64(0xffff0000),
  28         BITMAP_FROM_U64(0x55555555),
  29         BITMAP_FROM_U64(0xaaaaaaaa),
  30         BITMAP_FROM_U64(0x11111111),
  31         BITMAP_FROM_U64(0x22222222),
  32         BITMAP_FROM_U64(0xffffffff),
  33         BITMAP_FROM_U64(0xfffffffe),
  34         BITMAP_FROM_U64(0x3333333311111111ULL),
  35         BITMAP_FROM_U64(0xffffffff77777777ULL),
  36         BITMAP_FROM_U64(0),
  37 };
  38
  39 static const unsigned long exp2[] __initconst = {
  40         BITMAP_FROM_U64(0x3333333311111111ULL),
  41         BITMAP_FROM_U64(0xffffffff77777777ULL),
  42 };
  43
  44 /* Fibonacci sequence */
  45 static const unsigned long exp2_to_exp3_mask[] __initconst = {
  46         BITMAP_FROM_U64(0x008000020020212eULL),
  47 };
  48 /* exp3_0_1 = (exp2[0] & ~exp2_to_exp3_mask) | (exp2[1] & exp2_to_exp3_mask) */
  49 static const unsigned long exp3_0_1[] __initconst = {
  50         BITMAP_FROM_U64(0x33b3333311313137ULL),
  51 };
  52 /* exp3_1_0 = (exp2[1] & ~exp2_to_exp3_mask) | (exp2[0] & exp2_to_exp3_mask) */
  53 static const unsigned long exp3_1_0[] __initconst = {
  54         BITMAP_FROM_U64(0xff7fffff77575751ULL),
  55 };
  56
  57 static bool __init
  58 __check_eq_uint(const char *srcfile, unsigned int line,
  59                 const unsigned int exp_uint, unsigned int x)
  60 {
  61         if (exp_uint != x) {
  62                 pr_err("[%s:%u] expected %u, got %u\n",
  63                         srcfile, line, exp_uint, x);
  64                 return false;
  65         }
  66         return true;
  67 }
  68
  69
  70 static bool __init
  71 __check_eq_bitmap(const char *srcfile, unsigned int line,
  72                   const unsigned long *exp_bmap, const unsigned long *bmap,
  73                   unsigned int nbits)
  74 {
  75         if (!bitmap_equal(exp_bmap, bmap, nbits)) {
  76                 pr_warn("[%s:%u] bitmaps contents differ: expected \"%*pbl\", got \"%*pbl\"\n",
  77                         srcfile, line,
  78                         nbits, exp_bmap, nbits, bmap);
  79                 return false;
  80         }
  81         return true;
  82 }
  83
  84 static bool __init
  85 __check_eq_pbl(const char *srcfile, unsigned int line,
  86                const char *expected_pbl,
  87                const unsigned long *bitmap, unsigned int nbits)
  88 {
  89         snprintf(pbl_buffer, sizeof(pbl_buffer), "%*pbl", nbits, bitmap);
  90         if (strcmp(expected_pbl, pbl_buffer)) {
  91                 pr_warn("[%s:%u] expected \"%s\", got \"%s\"\n",
  92                         srcfile, line,
  93                         expected_pbl, pbl_buffer);
  94                 return false;
  95         }
  96         return true;
  97 }
  98
  99 static bool __init
 100 __check_eq_u32_array(const char *srcfile, unsigned int line,
 101                      const u32 *exp_arr, unsigned int exp_len,
 102                      const u32 *arr, unsigned int len) __used;
 103 static bool __init
 104 __check_eq_u32_array(const char *srcfile, unsigned int line,
 105                      const u32 *exp_arr, unsigned int exp_len,
 106                      const u32 *arr, unsigned int len)
 107 {
 108         if (exp_len != len) {
 109                 pr_warn("[%s:%u] array length differ: expected %u, got %u\n",
 110                         srcfile, line,
 111                         exp_len, len);
 112                 return false;
 113         }
 114
 115         if (memcmp(exp_arr, arr, len*sizeof(*arr))) {
 116                 pr_warn("[%s:%u] array contents differ\n", srcfile, line);
 117                 print_hex_dump(KERN_WARNING, "  exp:  ", DUMP_PREFIX_OFFSET,
 118                                32, 4, exp_arr, exp_len*sizeof(*exp_arr), false);
 119                 print_hex_dump(KERN_WARNING, "  got:  ", DUMP_PREFIX_OFFSET,
 120                                32, 4, arr, len*sizeof(*arr), false);
 121                 return false;
 122         }
 123
 124         return true;
 125 }
 126
 127 static bool __init __check_eq_clump8(const char *srcfile, unsigned int line,
 128                                     const unsigned int offset,
 129                                     const unsigned int size,
 130                                     const unsigned char *const clump_exp,
 131                                     const unsigned long *const clump)
 132 {
 133         unsigned long exp;
 134
 135         if (offset >= size) {
 136                 pr_warn("[%s:%u] bit offset for clump out-of-bounds: expected less than %u, got %u\n",
 137                         srcfile, line, size, offset);
 138                 return false;
 139         }
 140
 141         exp = clump_exp[offset / 8];
 142         if (!exp) {
 143                 pr_warn("[%s:%u] bit offset for zero clump: expected nonzero clump, got bit offset %u with clump value 0",
 144                         srcfile, line, offset);
 145                 return false;
 146         }
 147
 148         if (*clump != exp) {
 149                 pr_warn("[%s:%u] expected clump value of 0x%lX, got clump value of 0x%lX",
 150                         srcfile, line, exp, *clump);
 151                 return false;
 152         }
 153
 154         return true;
 155 }
 156
 157 #define __expect_eq(suffix, ...)                                        \
 158         ({                                                              \
 159                 int result = 0;                                         \
 160                 total_tests++;                                          \
 161                 if (!__check_eq_ ## suffix(__FILE__, __LINE__,          \
 162                                            ##__VA_ARGS__)) {            \
 163                         failed_tests++;                                 \
 164                         result = 1;                                     \
 165                 }                                                       \
 166                 result;                                                 \
 167         })
 168
 169 #define expect_eq_uint(...)             __expect_eq(uint, ##__VA_ARGS__)
 170 #define expect_eq_bitmap(...)           __expect_eq(bitmap, ##__VA_ARGS__)
 171 #define expect_eq_pbl(...)              __expect_eq(pbl, ##__VA_ARGS__)
 172 #define expect_eq_u32_array(...)        __expect_eq(u32_array, ##__VA_ARGS__)
 173 #define expect_eq_clump8(...)           __expect_eq(clump8, ##__VA_ARGS__)
 174
 175 static void __init test_zero_clear(void)
 176 {
 177         DECLARE_BITMAP(bmap, 1024);
 178
 179         /* Known way to set all bits */
 180         memset(bmap, 0xff, 128);
 181
 182         expect_eq_pbl("0-22", bmap, 23);
 183         expect_eq_pbl("0-1023", bmap, 1024);
 184
 185         /* single-word bitmaps */
 186         bitmap_clear(bmap, 0, 9);
 187         expect_eq_pbl("9-1023", bmap, 1024);
 188
 189         bitmap_zero(bmap, 35);
 190         expect_eq_pbl("64-1023", bmap, 1024);
 191
 192         /* cross boundaries operations */
 193         bitmap_clear(bmap, 79, 19);
 194         expect_eq_pbl("64-78,98-1023", bmap, 1024);
 195
 196         bitmap_zero(bmap, 115);
 197         expect_eq_pbl("128-1023", bmap, 1024);
 198
 199         /* Zeroing entire area */
 200         bitmap_zero(bmap, 1024);
 201         expect_eq_pbl("", bmap, 1024);
 202 }
 203
 204 static void __init test_fill_set(void)
 205 {
 206         DECLARE_BITMAP(bmap, 1024);
 207
 208         /* Known way to clear all bits */
 209         memset(bmap, 0x00, 128);
 210
 211         expect_eq_pbl("", bmap, 23);
 212         expect_eq_pbl("", bmap, 1024);
 213
 214         /* single-word bitmaps */
 215         bitmap_set(bmap, 0, 9);
 216         expect_eq_pbl("0-8", bmap, 1024);
 217
 218         bitmap_fill(bmap, 35);
 219         expect_eq_pbl("0-63", bmap, 1024);
 220
 221         /* cross boundaries operations */
 222         bitmap_set(bmap, 79, 19);
 223         expect_eq_pbl("0-63,79-97", bmap, 1024);
 224
 225         bitmap_fill(bmap, 115);
 226         expect_eq_pbl("0-127", bmap, 1024);
 227
 228         /* Zeroing entire area */
 229         bitmap_fill(bmap, 1024);
 230         expect_eq_pbl("0-1023", bmap, 1024);
 231 }
 232
 233 static void __init test_copy(void)
 234 {
 235         DECLARE_BITMAP(bmap1, 1024);
 236         DECLARE_BITMAP(bmap2, 1024);
 237
 238         bitmap_zero(bmap1, 1024);
 239         bitmap_zero(bmap2, 1024);
 240
 241         /* single-word bitmaps */
 242         bitmap_set(bmap1, 0, 19);
 243         bitmap_copy(bmap2, bmap1, 23);
 244         expect_eq_pbl("0-18", bmap2, 1024);
 245
 246         bitmap_set(bmap2, 0, 23);
 247         bitmap_copy(bmap2, bmap1, 23);
 248         expect_eq_pbl("0-18", bmap2, 1024);
 249
 250         /* multi-word bitmaps */
 251         bitmap_set(bmap1, 0, 109);
 252         bitmap_copy(bmap2, bmap1, 1024);
 253         expect_eq_pbl("0-108", bmap2, 1024);
 254
 255         bitmap_fill(bmap2, 1024);
 256         bitmap_copy(bmap2, bmap1, 1024);
 257         expect_eq_pbl("0-108", bmap2, 1024);
 258
 259         /* the following tests assume a 32- or 64-bit arch (even 128b
 260          * if we care)
 261          */
 262
 263         bitmap_fill(bmap2, 1024);
 264         bitmap_copy(bmap2, bmap1, 109);  /* ... but 0-padded til word length */
 265         expect_eq_pbl("0-108,128-1023", bmap2, 1024);
 266
 267         bitmap_fill(bmap2, 1024);
 268         bitmap_copy(bmap2, bmap1, 97);  /* ... but aligned on word length */
 269         expect_eq_pbl("0-108,128-1023", bmap2, 1024);
 270 }
 271
 272 #define EXP2_IN_BITS    (sizeof(exp2) * 8)
 273
 274 static void __init test_replace(void)
 275 {
 276         unsigned int nbits = 64;
 277         unsigned int nlongs = DIV_ROUND_UP(nbits, BITS_PER_LONG);
 278         DECLARE_BITMAP(bmap, 1024);
 279
 280         BUILD_BUG_ON(EXP2_IN_BITS < nbits * 2);
 281
 282         bitmap_zero(bmap, 1024);
 283         bitmap_replace(bmap, &exp2[0 * nlongs], &exp2[1 * nlongs], exp2_to_exp3_mask, nbits);
 284         expect_eq_bitmap(bmap, exp3_0_1, nbits);
 285
 286         bitmap_zero(bmap, 1024);
 287         bitmap_replace(bmap, &exp2[1 * nlongs], &exp2[0 * nlongs], exp2_to_exp3_mask, nbits);
 288         expect_eq_bitmap(bmap, exp3_1_0, nbits);
 289
 290         bitmap_fill(bmap, 1024);
 291         bitmap_replace(bmap, &exp2[0 * nlongs], &exp2[1 * nlongs], exp2_to_exp3_mask, nbits);
 292         expect_eq_bitmap(bmap, exp3_0_1, nbits);
 293
 294         bitmap_fill(bmap, 1024);
 295         bitmap_replace(bmap, &exp2[1 * nlongs], &exp2[0 * nlongs], exp2_to_exp3_mask, nbits);
 296         expect_eq_bitmap(bmap, exp3_1_0, nbits);
 297 }
 298
 299 #define PARSE_TIME      0x1
 300 #define NO_LEN          0x2
 301
 302 struct test_bitmap_parselist{
 303         const int errno;
 304         const char *in;
 305         const unsigned long *expected;
 306         const int nbits;
 307         const int flags;
 308 };
 309
 310 static const struct test_bitmap_parselist parselist_tests[] __initconst = {
 311 #define step (sizeof(u64) / sizeof(unsigned long))
 312
 313         {0, "0",                        &exp1[0], 8, 0},
 314         {0, "1",                        &exp1[1 * step], 8, 0},
 315         {0, "0-15",                     &exp1[2 * step], 32, 0},
 316         {0, "16-31",                    &exp1[3 * step], 32, 0},
 317         {0, "0-31:1/2",                 &exp1[4 * step], 32, 0},
 318         {0, "1-31:1/2",                 &exp1[5 * step], 32, 0},
 319         {0, "0-31:1/4",                 &exp1[6 * step], 32, 0},
 320         {0, "1-31:1/4",                 &exp1[7 * step], 32, 0},
 321         {0, "0-31:4/4",                 &exp1[8 * step], 32, 0},
 322         {0, "1-31:4/4",                 &exp1[9 * step], 32, 0},
 323         {0, "0-31:1/4,32-63:2/4",       &exp1[10 * step], 64, 0},
 324         {0, "0-31:3/4,32-63:4/4",       &exp1[11 * step], 64, 0},
 325         {0, "  ,,  0-31:3/4  ,, 32-63:4/4  ,,  ",       &exp1[11 * step], 64, 0},
 326
 327         {0, "0-31:1/4,32-63:2/4,64-95:3/4,96-127:4/4",  exp2, 128, 0},
 328
 329         {0, "0-2047:128/256", NULL, 2048, PARSE_TIME},
 330
 331         {0, "",                         &exp1[12 * step], 8, 0},
 332         {0, "\n",                       &exp1[12 * step], 8, 0},
 333         {0, ",,  ,,  , ,  ,",           &exp1[12 * step], 8, 0},
 334         {0, " ,  ,,  , ,   ",           &exp1[12 * step], 8, 0},
 335         {0, " ,  ,,  , ,   \n",         &exp1[12 * step], 8, 0},
 336
 337         {-EINVAL, "-1", NULL, 8, 0},
 338         {-EINVAL, "-0", NULL, 8, 0},
 339         {-EINVAL, "10-1", NULL, 8, 0},
 340         {-EINVAL, "0-31:", NULL, 8, 0},
 341         {-EINVAL, "0-31:0", NULL, 8, 0},
 342         {-EINVAL, "0-31:0/", NULL, 8, 0},
 343         {-EINVAL, "0-31:0/0", NULL, 8, 0},
 344         {-EINVAL, "0-31:1/0", NULL, 8, 0},
 345         {-EINVAL, "0-31:10/1", NULL, 8, 0},
 346         {-EOVERFLOW, "0-98765432123456789:10/1", NULL, 8, 0},
 347
 348         {-EINVAL, "a-31", NULL, 8, 0},
 349         {-EINVAL, "0-a1", NULL, 8, 0},
 350         {-EINVAL, "a-31:10/1", NULL, 8, 0},
 351         {-EINVAL, "0-31:a/1", NULL, 8, 0},
 352         {-EINVAL, "0-\n", NULL, 8, 0},
 353
 354 };
 355
 356 static void __init test_bitmap_parselist(void)
 357 {
 358         int i;
 359         int err;
 360         ktime_t time;
 361         DECLARE_BITMAP(bmap, 2048);
 362
 363         for (i = 0; i < ARRAY_SIZE(parselist_tests); i++) {
 364 #define ptest parselist_tests[i]
 365
 366                 time = ktime_get();
 367                 err = bitmap_parselist(ptest.in, bmap, ptest.nbits);
 368                 time = ktime_get() - time;
 369
 370                 if (err != ptest.errno) {
 371                         pr_err("parselist: %d: input is %s, errno is %d, expected %d\n",
 372                                         i, ptest.in, err, ptest.errno);
 373                         continue;
 374                 }
 375
 376                 if (!err && ptest.expected
 377                          && !__bitmap_equal(bmap, ptest.expected, ptest.nbits)) {
 378                         pr_err("parselist: %d: input is %s, result is 0x%lx, expected 0x%lx\n",
 379                                         i, ptest.in, bmap[0],
 380                                         *ptest.expected);
 381                         continue;
 382                 }
 383
 384                 if (ptest.flags & PARSE_TIME)
 385                         pr_err("parselist: %d: input is '%s' OK, Time: %llu\n",
 386                                         i, ptest.in, time);
 387
 388 #undef ptest
 389         }
 390 }
 391
 392 static const unsigned long parse_test[] __initconst = {
 393         BITMAP_FROM_U64(0),
 394         BITMAP_FROM_U64(1),
 395         BITMAP_FROM_U64(0xdeadbeef),
 396         BITMAP_FROM_U64(0x100000000ULL),
 397 };
 398
 399 static const unsigned long parse_test2[] __initconst = {
 400         BITMAP_FROM_U64(0x100000000ULL), BITMAP_FROM_U64(0xdeadbeef),
 401         BITMAP_FROM_U64(0x100000000ULL), BITMAP_FROM_U64(0xbaadf00ddeadbeef),
 402         BITMAP_FROM_U64(0x100000000ULL), BITMAP_FROM_U64(0x0badf00ddeadbeef),
 403 };
 404
 405 static const struct test_bitmap_parselist parse_tests[] __initconst = {
 406         {0, "",                         &parse_test[0 * step], 32, 0},
 407         {0, " ",                        &parse_test[0 * step], 32, 0},
 408         {0, "0",                        &parse_test[0 * step], 32, 0},
 409         {0, "0\n",                      &parse_test[0 * step], 32, 0},
 410         {0, "1",                        &parse_test[1 * step], 32, 0},
 411         {0, "deadbeef",                 &parse_test[2 * step], 32, 0},
 412         {0, "1,0",                      &parse_test[3 * step], 33, 0},
 413         {0, "deadbeef,\n,0,1",          &parse_test[2 * step], 96, 0},
 414
 415         {0, "deadbeef,1,0",             &parse_test2[0 * 2 * step], 96, 0},
 416         {0, "baadf00d,deadbeef,1,0",    &parse_test2[1 * 2 * step], 128, 0},
 417         {0, "badf00d,deadbeef,1,0",     &parse_test2[2 * 2 * step], 124, 0},
 418         {0, "badf00d,deadbeef,1,0",     &parse_test2[2 * 2 * step], 124, NO_LEN},
 419         {0, "  badf00d,deadbeef,1,0  ", &parse_test2[2 * 2 * step], 124, 0},
 420         {0, " , badf00d,deadbeef,1,0 , ",       &parse_test2[2 * 2 * step], 124, 0},
 421         {0, " , badf00d, ,, ,,deadbeef,1,0 , ", &parse_test2[2 * 2 * step], 124, 0},
 422
 423         {-EINVAL,    "goodfood,deadbeef,1,0",   NULL, 128, 0},
 424         {-EOVERFLOW, "3,0",                     NULL, 33, 0},
 425         {-EOVERFLOW, "123badf00d,deadbeef,1,0", NULL, 128, 0},
 426         {-EOVERFLOW, "badf00d,deadbeef,1,0",    NULL, 90, 0},
 427         {-EOVERFLOW, "fbadf00d,deadbeef,1,0",   NULL, 95, 0},
 428         {-EOVERFLOW, "badf00d,deadbeef,1,0",    NULL, 100, 0},
 429 #undef step
 430 };
 431
 432 static void __init test_bitmap_parse(void)
 433 {
 434         int i;
 435         int err;
 436         ktime_t time;
 437         DECLARE_BITMAP(bmap, 2048);
 438
 439         for (i = 0; i < ARRAY_SIZE(parse_tests); i++) {
 440                 struct test_bitmap_parselist test = parse_tests[i];
 441                 size_t len = test.flags & NO_LEN ? UINT_MAX : strlen(test.in);
 442
 443                 time = ktime_get();
 444                 err = bitmap_parse(test.in, len, bmap, test.nbits);
 445                 time = ktime_get() - time;
 446
 447                 if (err != test.errno) {
 448                         pr_err("parse: %d: input is %s, errno is %d, expected %d\n",
 449                                         i, test.in, err, test.errno);
 450                         continue;
 451                 }
 452
 453                 if (!err && test.expected
 454                          && !__bitmap_equal(bmap, test.expected, test.nbits)) {
 455                         pr_err("parse: %d: input is %s, result is 0x%lx, expected 0x%lx\n",
 456                                         i, test.in, bmap[0],
 457                                         *test.expected);
 458                         continue;
 459                 }
 460
 461                 if (test.flags & PARSE_TIME)
 462                         pr_err("parse: %d: input is '%s' OK, Time: %llu\n",
 463                                         i, test.in, time);
 464         }
 465 }
 466
 467 #define EXP1_IN_BITS    (sizeof(exp1) * 8)
 468
 469 static void __init test_bitmap_arr32(void)
 470 {
 471         unsigned int nbits, next_bit;
 472         u32 arr[EXP1_IN_BITS / 32];
 473         DECLARE_BITMAP(bmap2, EXP1_IN_BITS);
 474
 475         memset(arr, 0xa5, sizeof(arr));
 476
 477         for (nbits = 0; nbits < EXP1_IN_BITS; ++nbits) {
 478                 bitmap_to_arr32(arr, exp1, nbits);
 479                 bitmap_from_arr32(bmap2, arr, nbits);
 480                 expect_eq_bitmap(bmap2, exp1, nbits);
 481
 482                 next_bit = find_next_bit(bmap2,
 483                                 round_up(nbits, BITS_PER_LONG), nbits);
 484                 if (next_bit < round_up(nbits, BITS_PER_LONG))
 485                         pr_err("bitmap_copy_arr32(nbits == %d:"
 486                                 " tail is not safely cleared: %d\n",
 487                                 nbits, next_bit);
 488
 489                 if (nbits < EXP1_IN_BITS - 32)
 490                         expect_eq_uint(arr[DIV_ROUND_UP(nbits, 32)],
 491                                                                 0xa5a5a5a5);
 492         }
 493 }
 494
 495 static void noinline __init test_mem_optimisations(void)
 496 {
 497         DECLARE_BITMAP(bmap1, 1024);
 498         DECLARE_BITMAP(bmap2, 1024);
 499         unsigned int start, nbits;
 500
 501         for (start = 0; start < 1024; start += 8) {
 502                 for (nbits = 0; nbits < 1024 - start; nbits += 8) {
 503                         memset(bmap1, 0x5a, sizeof(bmap1));
 504                         memset(bmap2, 0x5a, sizeof(bmap2));
 505
 506                         bitmap_set(bmap1, start, nbits);
 507                         __bitmap_set(bmap2, start, nbits);
 508                         if (!bitmap_equal(bmap1, bmap2, 1024)) {
 509                                 printk("set not equal %d %d\n", start, nbits);
 510                                 failed_tests++;
 511                         }
 512                         if (!__bitmap_equal(bmap1, bmap2, 1024)) {
 513                                 printk("set not __equal %d %d\n", start, nbits);
 514                                 failed_tests++;
 515                         }
 516
 517                         bitmap_clear(bmap1, start, nbits);
 518                         __bitmap_clear(bmap2, start, nbits);
 519                         if (!bitmap_equal(bmap1, bmap2, 1024)) {
 520                                 printk("clear not equal %d %d\n", start, nbits);
 521                                 failed_tests++;
 522                         }
 523                         if (!__bitmap_equal(bmap1, bmap2, 1024)) {
 524                                 printk("clear not __equal %d %d\n", start,
 525                                                                         nbits);
 526                                 failed_tests++;
 527                         }
 528                 }
 529         }
 530 }
 531
 532 static const unsigned char clump_exp[] __initconst = {
 533         0x01,   /* 1 bit set */
 534         0x02,   /* non-edge 1 bit set */
 535         0x00,   /* zero bits set */
 536         0x38,   /* 3 bits set across 4-bit boundary */
 537         0x38,   /* Repeated clump */
 538         0x0F,   /* 4 bits set */
 539         0xFF,   /* all bits set */
 540         0x05,   /* non-adjacent 2 bits set */
 541 };
 542
 543 static void __init test_for_each_set_clump8(void)
 544 {
 545 #define CLUMP_EXP_NUMBITS 64
 546         DECLARE_BITMAP(bits, CLUMP_EXP_NUMBITS);
 547         unsigned int start;
 548         unsigned long clump;
 549
 550         /* set bitmap to test case */
 551         bitmap_zero(bits, CLUMP_EXP_NUMBITS);
 552         bitmap_set(bits, 0, 1);         /* 0x01 */
 553         bitmap_set(bits, 9, 1);         /* 0x02 */
 554         bitmap_set(bits, 27, 3);        /* 0x28 */
 555         bitmap_set(bits, 35, 3);        /* 0x28 */
 556         bitmap_set(bits, 40, 4);        /* 0x0F */
 557         bitmap_set(bits, 48, 8);        /* 0xFF */
 558         bitmap_set(bits, 56, 1);        /* 0x05 - part 1 */
 559         bitmap_set(bits, 58, 1);        /* 0x05 - part 2 */
 560
 561         for_each_set_clump8(start, clump, bits, CLUMP_EXP_NUMBITS)
 562                 expect_eq_clump8(start, CLUMP_EXP_NUMBITS, clump_exp, &clump);
 563 }
 564
 565 struct test_bitmap_cut {
 566         unsigned int first;
 567         unsigned int cut;
 568         unsigned int nbits;
 569         unsigned long in[4];
 570         unsigned long expected[4];
 571 };
 572
 573 static struct test_bitmap_cut test_cut[] = {
 574         {  0,  0,  8, { 0x0000000aUL, }, { 0x0000000aUL, }, },
 575         {  0,  0, 32, { 0xdadadeadUL, }, { 0xdadadeadUL, }, },
 576         {  0,  3,  8, { 0x000000aaUL, }, { 0x00000015UL, }, },
 577         {  3,  3,  8, { 0x000000aaUL, }, { 0x00000012UL, }, },
 578         {  0,  1, 32, { 0xa5a5a5a5UL, }, { 0x52d2d2d2UL, }, },
 579         {  0,  8, 32, { 0xdeadc0deUL, }, { 0x00deadc0UL, }, },
 580         {  1,  1, 32, { 0x5a5a5a5aUL, }, { 0x2d2d2d2cUL, }, },
 581         {  0, 15, 32, { 0xa5a5a5a5UL, }, { 0x00014b4bUL, }, },
 582         {  0, 16, 32, { 0xa5a5a5a5UL, }, { 0x0000a5a5UL, }, },
 583         { 15, 15, 32, { 0xa5a5a5a5UL, }, { 0x000125a5UL, }, },
 584         { 15, 16, 32, { 0xa5a5a5a5UL, }, { 0x0000a5a5UL, }, },
 585         { 16, 15, 32, { 0xa5a5a5a5UL, }, { 0x0001a5a5UL, }, },
 586
 587         { BITS_PER_LONG, BITS_PER_LONG, BITS_PER_LONG,
 588                 { 0xa5a5a5a5UL, 0xa5a5a5a5UL, },
 589                 { 0xa5a5a5a5UL, 0xa5a5a5a5UL, },
 590         },
 591         { 1, BITS_PER_LONG - 1, BITS_PER_LONG,
 592                 { 0xa5a5a5a5UL, 0xa5a5a5a5UL, },
 593                 { 0x00000001UL, 0x00000001UL, },
 594         },
 595
 596         { 0, BITS_PER_LONG * 2, BITS_PER_LONG * 2 + 1,
 597                 { 0xa5a5a5a5UL, 0x00000001UL, 0x00000001UL, 0x00000001UL },
 598                 { 0x00000001UL, },
 599         },
 600         { 16, BITS_PER_LONG * 2 + 1, BITS_PER_LONG * 2 + 1 + 16,
 601                 { 0x0000ffffUL, 0x5a5a5a5aUL, 0x5a5a5a5aUL, 0x5a5a5a5aUL },
 602                 { 0x2d2dffffUL, },
 603         },
 604 };
 605
 606 static void __init test_bitmap_cut(void)
 607 {
 608         unsigned long b[5], *in = &b[1], *out = &b[0];  /* Partial overlap */
 609         int i;
 610
 611         for (i = 0; i < ARRAY_SIZE(test_cut); i++) {
 612                 struct test_bitmap_cut *t = &test_cut[i];
 613
 614                 memcpy(in, t->in, sizeof(t->in));
 615
 616                 bitmap_cut(out, in, t->first, t->cut, t->nbits);
 617
 618                 expect_eq_bitmap(t->expected, out, t->nbits);
 619         }
 620 }
 621
 622 static void __init selftest(void)
 623 {
 624         test_zero_clear();
 625         test_fill_set();
 626         test_copy();
 627         test_replace();
 628         test_bitmap_arr32();
 629         test_bitmap_parse();
 630         test_bitmap_parselist();
 631         test_mem_optimisations();
 632         test_for_each_set_clump8();
 633         test_bitmap_cut();
 634 }
 635
 636 KSTM_MODULE_LOADERS(test_bitmap);
 637 MODULE_AUTHOR("david decotigny <david.decotigny@googlers.com>");
 638 MODULE_LICENSE("GPL");