1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Test cases for printf facility. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/init.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/printk.h> 12 #include <linux/random.h> 13 #include <linux/rtc.h> 14 #include <linux/slab.h> 15 #include <linux/string.h> 16 17 #include <linux/bitmap.h> 18 #include <linux/dcache.h> 19 #include <linux/socket.h> 20 #include <linux/in.h> 21 22 #include <linux/gfp.h> 23 #include <linux/mm.h> 24 25 #include <linux/property.h> 26 27 #include "../tools/testing/selftests/kselftest_module.h" 28 29 #define BUF_SIZE 256 30 #define PAD_SIZE 16 31 #define FILL_CHAR '$' 32 33 KSTM_MODULE_GLOBALS(); 34 35 static char *test_buffer __initdata; 36 static char *alloced_buffer __initdata; 37 38 extern bool no_hash_pointers; 39 40 static int __printf(4, 0) __init 41 do_test(int bufsize, const char *expect, int elen, 42 const char *fmt, va_list ap) 43 { 44 va_list aq; 45 int ret, written; 46 47 total_tests++; 48 49 memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE); 50 va_copy(aq, ap); 51 ret = vsnprintf(test_buffer, bufsize, fmt, aq); 52 va_end(aq); 53 54 if (ret != elen) { 55 pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n", 56 bufsize, fmt, ret, elen); 57 return 1; 58 } 59 60 if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) { 61 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt); 62 return 1; 63 } 64 65 if (!bufsize) { 66 if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) { 67 pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n", 68 fmt); 69 return 1; 70 } 71 return 0; 72 } 73 74 written = min(bufsize-1, elen); 75 if (test_buffer[written]) { 76 pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n", 77 bufsize, fmt); 78 return 1; 79 } 80 81 if (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) { 82 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n", 83 bufsize, fmt); 84 return 1; 85 } 86 87 if (memcmp(test_buffer, expect, written)) { 88 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n", 89 bufsize, fmt, test_buffer, written, expect); 90 return 1; 91 } 92 return 0; 93 } 94 95 static void __printf(3, 4) __init 96 __test(const char *expect, int elen, const char *fmt, ...) 97 { 98 va_list ap; 99 int rand; 100 char *p; 101 102 if (elen >= BUF_SIZE) { 103 pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n", 104 elen, fmt); 105 failed_tests++; 106 return; 107 } 108 109 va_start(ap, fmt); 110 111 /* 112 * Every fmt+args is subjected to four tests: Three where we 113 * tell vsnprintf varying buffer sizes (plenty, not quite 114 * enough and 0), and then we also test that kvasprintf would 115 * be able to print it as expected. 116 */ 117 failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap); 118 rand = 1 + prandom_u32_max(elen+1); 119 /* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */ 120 failed_tests += do_test(rand, expect, elen, fmt, ap); 121 failed_tests += do_test(0, expect, elen, fmt, ap); 122 123 p = kvasprintf(GFP_KERNEL, fmt, ap); 124 if (p) { 125 total_tests++; 126 if (memcmp(p, expect, elen+1)) { 127 pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n", 128 fmt, p, expect); 129 failed_tests++; 130 } 131 kfree(p); 132 } 133 va_end(ap); 134 } 135 136 #define test(expect, fmt, ...) \ 137 __test(expect, strlen(expect), fmt, ##__VA_ARGS__) 138 139 static void __init 140 test_basic(void) 141 { 142 /* Work around annoying "warning: zero-length gnu_printf format string". */ 143 char nul = '\0'; 144 145 test("", &nul); 146 test("100%", "100%%"); 147 test("xxx%yyy", "xxx%cyyy", '%'); 148 __test("xxx\0yyy", 7, "xxx%cyyy", '\0'); 149 } 150 151 static void __init 152 test_number(void) 153 { 154 test("0x1234abcd ", "%#-12x", 0x1234abcd); 155 test(" 0x1234abcd", "%#12x", 0x1234abcd); 156 test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234); 157 test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1); 158 test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1); 159 test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627); 160 /* 161 * POSIX/C99: »The result of converting zero with an explicit 162 * precision of zero shall be no characters.« Hence the output 163 * from the below test should really be "00|0||| ". However, 164 * the kernel's printf also produces a single 0 in that 165 * case. This test case simply documents the current 166 * behaviour. 167 */ 168 test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0); 169 #ifndef __CHAR_UNSIGNED__ 170 { 171 /* 172 * Passing a 'char' to a %02x specifier doesn't do 173 * what was presumably the intention when char is 174 * signed and the value is negative. One must either & 175 * with 0xff or cast to u8. 176 */ 177 char val = -16; 178 test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val); 179 } 180 #endif 181 } 182 183 static void __init 184 test_string(void) 185 { 186 test("", "%s%.0s", "", "123"); 187 test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456"); 188 test("1 | 2|3 | 4|5 ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5"); 189 test("1234 ", "%-10.4s", "123456"); 190 test(" 1234", "%10.4s", "123456"); 191 /* 192 * POSIX and C99 say that a negative precision (which is only 193 * possible to pass via a * argument) should be treated as if 194 * the precision wasn't present, and that if the precision is 195 * omitted (as in %.s), the precision should be taken to be 196 * 0. However, the kernel's printf behave exactly opposite, 197 * treating a negative precision as 0 and treating an omitted 198 * precision specifier as if no precision was given. 199 * 200 * These test cases document the current behaviour; should 201 * anyone ever feel the need to follow the standards more 202 * closely, this can be revisited. 203 */ 204 test(" ", "%4.*s", -5, "123456"); 205 test("123456", "%.s", "123456"); 206 test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c"); 207 test("a | | ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c"); 208 } 209 210 #define PLAIN_BUF_SIZE 64 /* leave some space so we don't oops */ 211 212 #if BITS_PER_LONG == 64 213 214 #define PTR_WIDTH 16 215 #define PTR ((void *)0xffff0123456789abUL) 216 #define PTR_STR "ffff0123456789ab" 217 #define PTR_VAL_NO_CRNG "(____ptrval____)" 218 #define ZEROS "00000000" /* hex 32 zero bits */ 219 #define ONES "ffffffff" /* hex 32 one bits */ 220 221 static int __init 222 plain_format(void) 223 { 224 char buf[PLAIN_BUF_SIZE]; 225 int nchars; 226 227 nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR); 228 229 if (nchars != PTR_WIDTH) 230 return -1; 231 232 if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) { 233 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"", 234 PTR_VAL_NO_CRNG); 235 return 0; 236 } 237 238 if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0) 239 return -1; 240 241 return 0; 242 } 243 244 #else 245 246 #define PTR_WIDTH 8 247 #define PTR ((void *)0x456789ab) 248 #define PTR_STR "456789ab" 249 #define PTR_VAL_NO_CRNG "(ptrval)" 250 #define ZEROS "" 251 #define ONES "" 252 253 static int __init 254 plain_format(void) 255 { 256 /* Format is implicitly tested for 32 bit machines by plain_hash() */ 257 return 0; 258 } 259 260 #endif /* BITS_PER_LONG == 64 */ 261 262 static int __init 263 plain_hash_to_buffer(const void *p, char *buf, size_t len) 264 { 265 int nchars; 266 267 nchars = snprintf(buf, len, "%p", p); 268 269 if (nchars != PTR_WIDTH) 270 return -1; 271 272 if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) { 273 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"", 274 PTR_VAL_NO_CRNG); 275 return 0; 276 } 277 278 return 0; 279 } 280 281 static int __init 282 plain_hash(void) 283 { 284 char buf[PLAIN_BUF_SIZE]; 285 int ret; 286 287 ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE); 288 if (ret) 289 return ret; 290 291 if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0) 292 return -1; 293 294 return 0; 295 } 296 297 /* 298 * We can't use test() to test %p because we don't know what output to expect 299 * after an address is hashed. 300 */ 301 static void __init 302 plain(void) 303 { 304 int err; 305 306 if (no_hash_pointers) { 307 pr_warn("skipping plain 'p' tests"); 308 skipped_tests += 2; 309 return; 310 } 311 312 err = plain_hash(); 313 if (err) { 314 pr_warn("plain 'p' does not appear to be hashed\n"); 315 failed_tests++; 316 return; 317 } 318 319 err = plain_format(); 320 if (err) { 321 pr_warn("hashing plain 'p' has unexpected format\n"); 322 failed_tests++; 323 } 324 } 325 326 static void __init 327 test_hashed(const char *fmt, const void *p) 328 { 329 char buf[PLAIN_BUF_SIZE]; 330 int ret; 331 332 /* 333 * No need to increase failed test counter since this is assumed 334 * to be called after plain(). 335 */ 336 ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE); 337 if (ret) 338 return; 339 340 test(buf, fmt, p); 341 } 342 343 /* 344 * NULL pointers aren't hashed. 345 */ 346 static void __init 347 null_pointer(void) 348 { 349 test(ZEROS "00000000", "%p", NULL); 350 test(ZEROS "00000000", "%px", NULL); 351 test("(null)", "%pE", NULL); 352 } 353 354 /* 355 * Error pointers aren't hashed. 356 */ 357 static void __init 358 error_pointer(void) 359 { 360 test(ONES "fffffff5", "%p", ERR_PTR(-11)); 361 test(ONES "fffffff5", "%px", ERR_PTR(-11)); 362 test("(efault)", "%pE", ERR_PTR(-11)); 363 } 364 365 #define PTR_INVALID ((void *)0x000000ab) 366 367 static void __init 368 invalid_pointer(void) 369 { 370 test_hashed("%p", PTR_INVALID); 371 test(ZEROS "000000ab", "%px", PTR_INVALID); 372 test("(efault)", "%pE", PTR_INVALID); 373 } 374 375 static void __init 376 symbol_ptr(void) 377 { 378 } 379 380 static void __init 381 kernel_ptr(void) 382 { 383 /* We can't test this without access to kptr_restrict. */ 384 } 385 386 static void __init 387 struct_resource(void) 388 { 389 } 390 391 static void __init 392 addr(void) 393 { 394 } 395 396 static void __init 397 escaped_str(void) 398 { 399 } 400 401 static void __init 402 hex_string(void) 403 { 404 const char buf[3] = {0xc0, 0xff, 0xee}; 405 406 test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee", 407 "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf); 408 test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee", 409 "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf); 410 } 411 412 static void __init 413 mac(void) 414 { 415 const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05}; 416 417 test("2d:48:d6:fc:7a:05", "%pM", addr); 418 test("05:7a:fc:d6:48:2d", "%pMR", addr); 419 test("2d-48-d6-fc-7a-05", "%pMF", addr); 420 test("2d48d6fc7a05", "%pm", addr); 421 test("057afcd6482d", "%pmR", addr); 422 } 423 424 static void __init 425 ip4(void) 426 { 427 struct sockaddr_in sa; 428 429 sa.sin_family = AF_INET; 430 sa.sin_port = cpu_to_be16(12345); 431 sa.sin_addr.s_addr = cpu_to_be32(0x7f000001); 432 433 test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr); 434 test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa); 435 sa.sin_addr.s_addr = cpu_to_be32(0x01020304); 436 test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa); 437 } 438 439 static void __init 440 ip6(void) 441 { 442 } 443 444 static void __init 445 ip(void) 446 { 447 ip4(); 448 ip6(); 449 } 450 451 static void __init 452 uuid(void) 453 { 454 const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 455 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf}; 456 457 test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid); 458 test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid); 459 test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid); 460 test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid); 461 } 462 463 static struct dentry test_dentry[4] __initdata = { 464 { .d_parent = &test_dentry[0], 465 .d_name = QSTR_INIT(test_dentry[0].d_iname, 3), 466 .d_iname = "foo" }, 467 { .d_parent = &test_dentry[0], 468 .d_name = QSTR_INIT(test_dentry[1].d_iname, 5), 469 .d_iname = "bravo" }, 470 { .d_parent = &test_dentry[1], 471 .d_name = QSTR_INIT(test_dentry[2].d_iname, 4), 472 .d_iname = "alfa" }, 473 { .d_parent = &test_dentry[2], 474 .d_name = QSTR_INIT(test_dentry[3].d_iname, 5), 475 .d_iname = "romeo" }, 476 }; 477 478 static void __init 479 dentry(void) 480 { 481 test("foo", "%pd", &test_dentry[0]); 482 test("foo", "%pd2", &test_dentry[0]); 483 484 test("(null)", "%pd", NULL); 485 test("(efault)", "%pd", PTR_INVALID); 486 test("(null)", "%pD", NULL); 487 test("(efault)", "%pD", PTR_INVALID); 488 489 test("romeo", "%pd", &test_dentry[3]); 490 test("alfa/romeo", "%pd2", &test_dentry[3]); 491 test("bravo/alfa/romeo", "%pd3", &test_dentry[3]); 492 test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]); 493 test("/bravo/alfa", "%pd4", &test_dentry[2]); 494 495 test("bravo/alfa |bravo/alfa ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]); 496 test(" bravo/alfa| bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]); 497 } 498 499 static void __init 500 struct_va_format(void) 501 { 502 } 503 504 static void __init 505 time_and_date(void) 506 { 507 /* 1543210543 */ 508 const struct rtc_time tm = { 509 .tm_sec = 43, 510 .tm_min = 35, 511 .tm_hour = 5, 512 .tm_mday = 26, 513 .tm_mon = 10, 514 .tm_year = 118, 515 }; 516 /* 2019-01-04T15:32:23 */ 517 time64_t t = 1546615943; 518 519 test("(%pt?)", "%pt", &tm); 520 test("2018-11-26T05:35:43", "%ptR", &tm); 521 test("0118-10-26T05:35:43", "%ptRr", &tm); 522 test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm); 523 test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm); 524 test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm); 525 test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm); 526 527 test("2019-01-04T15:32:23", "%ptT", &t); 528 test("0119-00-04T15:32:23", "%ptTr", &t); 529 test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t); 530 test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t); 531 532 test("2019-01-04 15:32:23", "%ptTs", &t); 533 test("0119-00-04 15:32:23", "%ptTsr", &t); 534 test("15:32:23|2019-01-04", "%ptTts|%ptTds", &t, &t); 535 test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t); 536 } 537 538 static void __init 539 struct_clk(void) 540 { 541 } 542 543 static void __init 544 large_bitmap(void) 545 { 546 const int nbits = 1 << 16; 547 unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL); 548 if (!bits) 549 return; 550 551 bitmap_set(bits, 1, 20); 552 bitmap_set(bits, 60000, 15); 553 test("1-20,60000-60014", "%*pbl", nbits, bits); 554 bitmap_free(bits); 555 } 556 557 static void __init 558 bitmap(void) 559 { 560 DECLARE_BITMAP(bits, 20); 561 const int primes[] = {2,3,5,7,11,13,17,19}; 562 int i; 563 564 bitmap_zero(bits, 20); 565 test("00000|00000", "%20pb|%*pb", bits, 20, bits); 566 test("|", "%20pbl|%*pbl", bits, 20, bits); 567 568 for (i = 0; i < ARRAY_SIZE(primes); ++i) 569 set_bit(primes[i], bits); 570 test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits); 571 test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits); 572 573 bitmap_fill(bits, 20); 574 test("fffff|fffff", "%20pb|%*pb", bits, 20, bits); 575 test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits); 576 577 large_bitmap(); 578 } 579 580 static void __init 581 netdev_features(void) 582 { 583 } 584 585 struct page_flags_test { 586 int width; 587 int shift; 588 int mask; 589 const char *fmt; 590 const char *name; 591 }; 592 593 static const struct page_flags_test pft[] = { 594 {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK, 595 "%d", "section"}, 596 {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK, 597 "%d", "node"}, 598 {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK, 599 "%d", "zone"}, 600 {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK, 601 "%#x", "lastcpupid"}, 602 {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK, 603 "%#x", "kasantag"}, 604 }; 605 606 static void __init 607 page_flags_test(int section, int node, int zone, int last_cpupid, 608 int kasan_tag, unsigned long flags, const char *name, 609 char *cmp_buf) 610 { 611 unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag}; 612 unsigned long size; 613 bool append = false; 614 int i; 615 616 for (i = 0; i < ARRAY_SIZE(values); i++) 617 flags |= (values[i] & pft[i].mask) << pft[i].shift; 618 619 size = scnprintf(cmp_buf, BUF_SIZE, "%#lx(", flags); 620 if (flags & PAGEFLAGS_MASK) { 621 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name); 622 append = true; 623 } 624 625 for (i = 0; i < ARRAY_SIZE(pft); i++) { 626 if (!pft[i].width) 627 continue; 628 629 if (append) 630 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "|"); 631 632 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s=", 633 pft[i].name); 634 size += scnprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt, 635 values[i] & pft[i].mask); 636 append = true; 637 } 638 639 snprintf(cmp_buf + size, BUF_SIZE - size, ")"); 640 641 test(cmp_buf, "%pGp", &flags); 642 } 643 644 static void __init 645 flags(void) 646 { 647 unsigned long flags; 648 char *cmp_buffer; 649 gfp_t gfp; 650 651 cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL); 652 if (!cmp_buffer) 653 return; 654 655 flags = 0; 656 page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer); 657 658 flags = 1UL << NR_PAGEFLAGS; 659 page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer); 660 661 flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru 662 | 1UL << PG_active | 1UL << PG_swapbacked; 663 page_flags_test(1, 1, 1, 0x1fffff, 1, flags, 664 "uptodate|dirty|lru|active|swapbacked", 665 cmp_buffer); 666 667 flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; 668 test("read|exec|mayread|maywrite|mayexec", "%pGv", &flags); 669 670 gfp = GFP_TRANSHUGE; 671 test("GFP_TRANSHUGE", "%pGg", &gfp); 672 673 gfp = GFP_ATOMIC|__GFP_DMA; 674 test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp); 675 676 gfp = __GFP_ATOMIC; 677 test("__GFP_ATOMIC", "%pGg", &gfp); 678 679 /* Any flags not translated by the table should remain numeric */ 680 gfp = ~__GFP_BITS_MASK; 681 snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp); 682 test(cmp_buffer, "%pGg", &gfp); 683 684 snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx", 685 (unsigned long) gfp); 686 gfp |= __GFP_ATOMIC; 687 test(cmp_buffer, "%pGg", &gfp); 688 689 kfree(cmp_buffer); 690 } 691 692 static void __init fwnode_pointer(void) 693 { 694 const struct software_node softnodes[] = { 695 { .name = "first", }, 696 { .name = "second", .parent = &softnodes[0], }, 697 { .name = "third", .parent = &softnodes[1], }, 698 { NULL /* Guardian */ } 699 }; 700 const char * const full_name = "first/second/third"; 701 const char * const full_name_second = "first/second"; 702 const char * const second_name = "second"; 703 const char * const third_name = "third"; 704 int rval; 705 706 rval = software_node_register_nodes(softnodes); 707 if (rval) { 708 pr_warn("cannot register softnodes; rval %d\n", rval); 709 return; 710 } 711 712 test(full_name_second, "%pfw", software_node_fwnode(&softnodes[1])); 713 test(full_name, "%pfw", software_node_fwnode(&softnodes[2])); 714 test(full_name, "%pfwf", software_node_fwnode(&softnodes[2])); 715 test(second_name, "%pfwP", software_node_fwnode(&softnodes[1])); 716 test(third_name, "%pfwP", software_node_fwnode(&softnodes[2])); 717 718 software_node_unregister_nodes(softnodes); 719 } 720 721 static void __init fourcc_pointer(void) 722 { 723 struct { 724 u32 code; 725 char *str; 726 } const try[] = { 727 { 0x3231564e, "NV12 little-endian (0x3231564e)", }, 728 { 0xb231564e, "NV12 big-endian (0xb231564e)", }, 729 { 0x10111213, ".... little-endian (0x10111213)", }, 730 { 0x20303159, "Y10 little-endian (0x20303159)", }, 731 }; 732 unsigned int i; 733 734 for (i = 0; i < ARRAY_SIZE(try); i++) 735 test(try[i].str, "%p4cc", &try[i].code); 736 } 737 738 static void __init 739 errptr(void) 740 { 741 test("-1234", "%pe", ERR_PTR(-1234)); 742 743 /* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */ 744 BUILD_BUG_ON(IS_ERR(PTR)); 745 test_hashed("%pe", PTR); 746 747 #ifdef CONFIG_SYMBOLIC_ERRNAME 748 test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK)); 749 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN)); 750 BUILD_BUG_ON(EAGAIN != EWOULDBLOCK); 751 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK)); 752 test("[-EIO ]", "[%-8pe]", ERR_PTR(-EIO)); 753 test("[ -EIO]", "[%8pe]", ERR_PTR(-EIO)); 754 test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER)); 755 #endif 756 } 757 758 static void __init 759 test_pointer(void) 760 { 761 plain(); 762 null_pointer(); 763 error_pointer(); 764 invalid_pointer(); 765 symbol_ptr(); 766 kernel_ptr(); 767 struct_resource(); 768 addr(); 769 escaped_str(); 770 hex_string(); 771 mac(); 772 ip(); 773 uuid(); 774 dentry(); 775 struct_va_format(); 776 time_and_date(); 777 struct_clk(); 778 bitmap(); 779 netdev_features(); 780 flags(); 781 errptr(); 782 fwnode_pointer(); 783 fourcc_pointer(); 784 } 785 786 static void __init selftest(void) 787 { 788 alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL); 789 if (!alloced_buffer) 790 return; 791 test_buffer = alloced_buffer + PAD_SIZE; 792 793 test_basic(); 794 test_number(); 795 test_string(); 796 test_pointer(); 797 798 kfree(alloced_buffer); 799 } 800 801 KSTM_MODULE_LOADERS(test_printf); 802 MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>"); 803 MODULE_LICENSE("GPL"); 804