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 #define NOWARN(option, comment, block) \ 34 __diag_push(); \ 35 __diag_ignore_all(#option, comment); \ 36 block \ 37 __diag_pop(); 38 39 KSTM_MODULE_GLOBALS(); 40 41 static char *test_buffer __initdata; 42 static char *alloced_buffer __initdata; 43 44 extern bool no_hash_pointers; 45 46 static int __printf(4, 0) __init 47 do_test(int bufsize, const char *expect, int elen, 48 const char *fmt, va_list ap) 49 { 50 va_list aq; 51 int ret, written; 52 53 total_tests++; 54 55 memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE); 56 va_copy(aq, ap); 57 ret = vsnprintf(test_buffer, bufsize, fmt, aq); 58 va_end(aq); 59 60 if (ret != elen) { 61 pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n", 62 bufsize, fmt, ret, elen); 63 return 1; 64 } 65 66 if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) { 67 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt); 68 return 1; 69 } 70 71 if (!bufsize) { 72 if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) { 73 pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n", 74 fmt); 75 return 1; 76 } 77 return 0; 78 } 79 80 written = min(bufsize-1, elen); 81 if (test_buffer[written]) { 82 pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n", 83 bufsize, fmt); 84 return 1; 85 } 86 87 if (memchr_inv(test_buffer + written + 1, FILL_CHAR, bufsize - (written + 1))) { 88 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n", 89 bufsize, fmt); 90 return 1; 91 } 92 93 if (memchr_inv(test_buffer + bufsize, FILL_CHAR, BUF_SIZE + PAD_SIZE - bufsize)) { 94 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond buffer\n", bufsize, fmt); 95 return 1; 96 } 97 98 if (memcmp(test_buffer, expect, written)) { 99 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n", 100 bufsize, fmt, test_buffer, written, expect); 101 return 1; 102 } 103 return 0; 104 } 105 106 static void __printf(3, 4) __init 107 __test(const char *expect, int elen, const char *fmt, ...) 108 { 109 va_list ap; 110 int rand; 111 char *p; 112 113 if (elen >= BUF_SIZE) { 114 pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n", 115 elen, fmt); 116 failed_tests++; 117 return; 118 } 119 120 va_start(ap, fmt); 121 122 /* 123 * Every fmt+args is subjected to four tests: Three where we 124 * tell vsnprintf varying buffer sizes (plenty, not quite 125 * enough and 0), and then we also test that kvasprintf would 126 * be able to print it as expected. 127 */ 128 failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap); 129 rand = get_random_u32_inclusive(1, elen + 1); 130 /* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */ 131 failed_tests += do_test(rand, expect, elen, fmt, ap); 132 failed_tests += do_test(0, expect, elen, fmt, ap); 133 134 p = kvasprintf(GFP_KERNEL, fmt, ap); 135 if (p) { 136 total_tests++; 137 if (memcmp(p, expect, elen+1)) { 138 pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n", 139 fmt, p, expect); 140 failed_tests++; 141 } 142 kfree(p); 143 } 144 va_end(ap); 145 } 146 147 #define test(expect, fmt, ...) \ 148 __test(expect, strlen(expect), fmt, ##__VA_ARGS__) 149 150 static void __init 151 test_basic(void) 152 { 153 /* Work around annoying "warning: zero-length gnu_printf format string". */ 154 char nul = '\0'; 155 156 test("", &nul); 157 test("100%", "100%%"); 158 test("xxx%yyy", "xxx%cyyy", '%'); 159 __test("xxx\0yyy", 7, "xxx%cyyy", '\0'); 160 } 161 162 static void __init 163 test_number(void) 164 { 165 test("0x1234abcd ", "%#-12x", 0x1234abcd); 166 test(" 0x1234abcd", "%#12x", 0x1234abcd); 167 test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234); 168 NOWARN(-Wformat, "Intentionally test narrowing conversion specifiers.", { 169 test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1); 170 test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1); 171 test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627); 172 }) 173 /* 174 * POSIX/C99: »The result of converting zero with an explicit 175 * precision of zero shall be no characters.« Hence the output 176 * from the below test should really be "00|0||| ". However, 177 * the kernel's printf also produces a single 0 in that 178 * case. This test case simply documents the current 179 * behaviour. 180 */ 181 test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0); 182 } 183 184 static void __init 185 test_string(void) 186 { 187 test("", "%s%.0s", "", "123"); 188 test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456"); 189 test("1 | 2|3 | 4|5 ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5"); 190 test("1234 ", "%-10.4s", "123456"); 191 test(" 1234", "%10.4s", "123456"); 192 /* 193 * POSIX and C99 say that a negative precision (which is only 194 * possible to pass via a * argument) should be treated as if 195 * the precision wasn't present, and that if the precision is 196 * omitted (as in %.s), the precision should be taken to be 197 * 0. However, the kernel's printf behave exactly opposite, 198 * treating a negative precision as 0 and treating an omitted 199 * precision specifier as if no precision was given. 200 * 201 * These test cases document the current behaviour; should 202 * anyone ever feel the need to follow the standards more 203 * closely, this can be revisited. 204 */ 205 test(" ", "%4.*s", -5, "123456"); 206 test("123456", "%.s", "123456"); 207 test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c"); 208 test("a | | ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c"); 209 } 210 211 #define PLAIN_BUF_SIZE 64 /* leave some space so we don't oops */ 212 213 #if BITS_PER_LONG == 64 214 215 #define PTR_WIDTH 16 216 #define PTR ((void *)0xffff0123456789abUL) 217 #define PTR_STR "ffff0123456789ab" 218 #define PTR_VAL_NO_CRNG "(____ptrval____)" 219 #define ZEROS "00000000" /* hex 32 zero bits */ 220 #define ONES "ffffffff" /* hex 32 one bits */ 221 222 static int __init 223 plain_format(void) 224 { 225 char buf[PLAIN_BUF_SIZE]; 226 int nchars; 227 228 nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR); 229 230 if (nchars != PTR_WIDTH) 231 return -1; 232 233 if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) { 234 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"", 235 PTR_VAL_NO_CRNG); 236 return 0; 237 } 238 239 if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0) 240 return -1; 241 242 return 0; 243 } 244 245 #else 246 247 #define PTR_WIDTH 8 248 #define PTR ((void *)0x456789ab) 249 #define PTR_STR "456789ab" 250 #define PTR_VAL_NO_CRNG "(ptrval)" 251 #define ZEROS "" 252 #define ONES "" 253 254 static int __init 255 plain_format(void) 256 { 257 /* Format is implicitly tested for 32 bit machines by plain_hash() */ 258 return 0; 259 } 260 261 #endif /* BITS_PER_LONG == 64 */ 262 263 static int __init 264 plain_hash_to_buffer(const void *p, char *buf, size_t len) 265 { 266 int nchars; 267 268 nchars = snprintf(buf, len, "%p", p); 269 270 if (nchars != PTR_WIDTH) 271 return -1; 272 273 if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) { 274 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"", 275 PTR_VAL_NO_CRNG); 276 return 0; 277 } 278 279 return 0; 280 } 281 282 static int __init 283 plain_hash(void) 284 { 285 char buf[PLAIN_BUF_SIZE]; 286 int ret; 287 288 ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE); 289 if (ret) 290 return ret; 291 292 if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0) 293 return -1; 294 295 return 0; 296 } 297 298 /* 299 * We can't use test() to test %p because we don't know what output to expect 300 * after an address is hashed. 301 */ 302 static void __init 303 plain(void) 304 { 305 int err; 306 307 if (no_hash_pointers) { 308 pr_warn("skipping plain 'p' tests"); 309 skipped_tests += 2; 310 return; 311 } 312 313 err = plain_hash(); 314 if (err) { 315 pr_warn("plain 'p' does not appear to be hashed\n"); 316 failed_tests++; 317 return; 318 } 319 320 err = plain_format(); 321 if (err) { 322 pr_warn("hashing plain 'p' has unexpected format\n"); 323 failed_tests++; 324 } 325 } 326 327 static void __init 328 test_hashed(const char *fmt, const void *p) 329 { 330 char buf[PLAIN_BUF_SIZE]; 331 int ret; 332 333 /* 334 * No need to increase failed test counter since this is assumed 335 * to be called after plain(). 336 */ 337 ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE); 338 if (ret) 339 return; 340 341 test(buf, fmt, p); 342 } 343 344 /* 345 * NULL pointers aren't hashed. 346 */ 347 static void __init 348 null_pointer(void) 349 { 350 test(ZEROS "00000000", "%p", NULL); 351 test(ZEROS "00000000", "%px", NULL); 352 test("(null)", "%pE", NULL); 353 } 354 355 /* 356 * Error pointers aren't hashed. 357 */ 358 static void __init 359 error_pointer(void) 360 { 361 test(ONES "fffffff5", "%p", ERR_PTR(-11)); 362 test(ONES "fffffff5", "%px", ERR_PTR(-11)); 363 test("(efault)", "%pE", ERR_PTR(-11)); 364 } 365 366 #define PTR_INVALID ((void *)0x000000ab) 367 368 static void __init 369 invalid_pointer(void) 370 { 371 test_hashed("%p", PTR_INVALID); 372 test(ZEROS "000000ab", "%px", PTR_INVALID); 373 test("(efault)", "%pE", PTR_INVALID); 374 } 375 376 static void __init 377 symbol_ptr(void) 378 { 379 } 380 381 static void __init 382 kernel_ptr(void) 383 { 384 /* We can't test this without access to kptr_restrict. */ 385 } 386 387 static void __init 388 struct_resource(void) 389 { 390 } 391 392 static void __init 393 addr(void) 394 { 395 } 396 397 static void __init 398 escaped_str(void) 399 { 400 } 401 402 static void __init 403 hex_string(void) 404 { 405 const char buf[3] = {0xc0, 0xff, 0xee}; 406 407 test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee", 408 "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf); 409 test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee", 410 "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf); 411 } 412 413 static void __init 414 mac(void) 415 { 416 const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05}; 417 418 test("2d:48:d6:fc:7a:05", "%pM", addr); 419 test("05:7a:fc:d6:48:2d", "%pMR", addr); 420 test("2d-48-d6-fc-7a-05", "%pMF", addr); 421 test("2d48d6fc7a05", "%pm", addr); 422 test("057afcd6482d", "%pmR", addr); 423 } 424 425 static void __init 426 ip4(void) 427 { 428 struct sockaddr_in sa; 429 430 sa.sin_family = AF_INET; 431 sa.sin_port = cpu_to_be16(12345); 432 sa.sin_addr.s_addr = cpu_to_be32(0x7f000001); 433 434 test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr); 435 test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa); 436 sa.sin_addr.s_addr = cpu_to_be32(0x01020304); 437 test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa); 438 } 439 440 static void __init 441 ip6(void) 442 { 443 } 444 445 static void __init 446 ip(void) 447 { 448 ip4(); 449 ip6(); 450 } 451 452 static void __init 453 uuid(void) 454 { 455 const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 456 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf}; 457 458 test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid); 459 test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid); 460 test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid); 461 test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid); 462 } 463 464 static struct dentry test_dentry[4] __initdata = { 465 { .d_parent = &test_dentry[0], 466 .d_name = QSTR_INIT(test_dentry[0].d_iname, 3), 467 .d_iname = "foo" }, 468 { .d_parent = &test_dentry[0], 469 .d_name = QSTR_INIT(test_dentry[1].d_iname, 5), 470 .d_iname = "bravo" }, 471 { .d_parent = &test_dentry[1], 472 .d_name = QSTR_INIT(test_dentry[2].d_iname, 4), 473 .d_iname = "alfa" }, 474 { .d_parent = &test_dentry[2], 475 .d_name = QSTR_INIT(test_dentry[3].d_iname, 5), 476 .d_iname = "romeo" }, 477 }; 478 479 static void __init 480 dentry(void) 481 { 482 test("foo", "%pd", &test_dentry[0]); 483 test("foo", "%pd2", &test_dentry[0]); 484 485 test("(null)", "%pd", NULL); 486 test("(efault)", "%pd", PTR_INVALID); 487 test("(null)", "%pD", NULL); 488 test("(efault)", "%pD", PTR_INVALID); 489 490 test("romeo", "%pd", &test_dentry[3]); 491 test("alfa/romeo", "%pd2", &test_dentry[3]); 492 test("bravo/alfa/romeo", "%pd3", &test_dentry[3]); 493 test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]); 494 test("/bravo/alfa", "%pd4", &test_dentry[2]); 495 496 test("bravo/alfa |bravo/alfa ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]); 497 test(" bravo/alfa| bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]); 498 } 499 500 static void __init 501 struct_va_format(void) 502 { 503 } 504 505 static void __init 506 time_and_date(void) 507 { 508 /* 1543210543 */ 509 const struct rtc_time tm = { 510 .tm_sec = 43, 511 .tm_min = 35, 512 .tm_hour = 5, 513 .tm_mday = 26, 514 .tm_mon = 10, 515 .tm_year = 118, 516 }; 517 /* 2019-01-04T15:32:23 */ 518 time64_t t = 1546615943; 519 520 test("(%pt?)", "%pt", &tm); 521 test("2018-11-26T05:35:43", "%ptR", &tm); 522 test("0118-10-26T05:35:43", "%ptRr", &tm); 523 test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm); 524 test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm); 525 test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm); 526 test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm); 527 528 test("2019-01-04T15:32:23", "%ptT", &t); 529 test("0119-00-04T15:32:23", "%ptTr", &t); 530 test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t); 531 test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t); 532 533 test("2019-01-04 15:32:23", "%ptTs", &t); 534 test("0119-00-04 15:32:23", "%ptTsr", &t); 535 test("15:32:23|2019-01-04", "%ptTts|%ptTds", &t, &t); 536 test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t); 537 } 538 539 static void __init 540 struct_clk(void) 541 { 542 } 543 544 static void __init 545 large_bitmap(void) 546 { 547 const int nbits = 1 << 16; 548 unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL); 549 if (!bits) 550 return; 551 552 bitmap_set(bits, 1, 20); 553 bitmap_set(bits, 60000, 15); 554 test("1-20,60000-60014", "%*pbl", nbits, bits); 555 bitmap_free(bits); 556 } 557 558 static void __init 559 bitmap(void) 560 { 561 DECLARE_BITMAP(bits, 20); 562 const int primes[] = {2,3,5,7,11,13,17,19}; 563 int i; 564 565 bitmap_zero(bits, 20); 566 test("00000|00000", "%20pb|%*pb", bits, 20, bits); 567 test("|", "%20pbl|%*pbl", bits, 20, bits); 568 569 for (i = 0; i < ARRAY_SIZE(primes); ++i) 570 set_bit(primes[i], bits); 571 test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits); 572 test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits); 573 574 bitmap_fill(bits, 20); 575 test("fffff|fffff", "%20pb|%*pb", bits, 20, bits); 576 test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits); 577 578 large_bitmap(); 579 } 580 581 static void __init 582 netdev_features(void) 583 { 584 } 585 586 struct page_flags_test { 587 int width; 588 int shift; 589 int mask; 590 const char *fmt; 591 const char *name; 592 }; 593 594 static const struct page_flags_test pft[] = { 595 {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK, 596 "%d", "section"}, 597 {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK, 598 "%d", "node"}, 599 {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK, 600 "%d", "zone"}, 601 {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK, 602 "%#x", "lastcpupid"}, 603 {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK, 604 "%#x", "kasantag"}, 605 }; 606 607 static void __init 608 page_flags_test(int section, int node, int zone, int last_cpupid, 609 int kasan_tag, unsigned long flags, const char *name, 610 char *cmp_buf) 611 { 612 unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag}; 613 unsigned long size; 614 bool append = false; 615 int i; 616 617 for (i = 0; i < ARRAY_SIZE(values); i++) 618 flags |= (values[i] & pft[i].mask) << pft[i].shift; 619 620 size = scnprintf(cmp_buf, BUF_SIZE, "%#lx(", flags); 621 if (flags & PAGEFLAGS_MASK) { 622 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name); 623 append = true; 624 } 625 626 for (i = 0; i < ARRAY_SIZE(pft); i++) { 627 if (!pft[i].width) 628 continue; 629 630 if (append) 631 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "|"); 632 633 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s=", 634 pft[i].name); 635 size += scnprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt, 636 values[i] & pft[i].mask); 637 append = true; 638 } 639 640 snprintf(cmp_buf + size, BUF_SIZE - size, ")"); 641 642 test(cmp_buf, "%pGp", &flags); 643 } 644 645 static void __init 646 flags(void) 647 { 648 unsigned long flags; 649 char *cmp_buffer; 650 gfp_t gfp; 651 652 cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL); 653 if (!cmp_buffer) 654 return; 655 656 flags = 0; 657 page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer); 658 659 flags = 1UL << NR_PAGEFLAGS; 660 page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer); 661 662 flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru 663 | 1UL << PG_active | 1UL << PG_swapbacked; 664 page_flags_test(1, 1, 1, 0x1fffff, 1, flags, 665 "uptodate|dirty|lru|active|swapbacked", 666 cmp_buffer); 667 668 flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; 669 test("read|exec|mayread|maywrite|mayexec", "%pGv", &flags); 670 671 gfp = GFP_TRANSHUGE; 672 test("GFP_TRANSHUGE", "%pGg", &gfp); 673 674 gfp = GFP_ATOMIC|__GFP_DMA; 675 test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp); 676 677 gfp = __GFP_ATOMIC; 678 test("__GFP_ATOMIC", "%pGg", &gfp); 679 680 /* Any flags not translated by the table should remain numeric */ 681 gfp = ~__GFP_BITS_MASK; 682 snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp); 683 test(cmp_buffer, "%pGg", &gfp); 684 685 snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx", 686 (unsigned long) gfp); 687 gfp |= __GFP_ATOMIC; 688 test(cmp_buffer, "%pGg", &gfp); 689 690 kfree(cmp_buffer); 691 } 692 693 static void __init fwnode_pointer(void) 694 { 695 const struct software_node first = { .name = "first" }; 696 const struct software_node second = { .name = "second", .parent = &first }; 697 const struct software_node third = { .name = "third", .parent = &second }; 698 const struct software_node *group[] = { &first, &second, &third, NULL }; 699 const char * const full_name_second = "first/second"; 700 const char * const full_name_third = "first/second/third"; 701 const char * const second_name = "second"; 702 const char * const third_name = "third"; 703 int rval; 704 705 rval = software_node_register_node_group(group); 706 if (rval) { 707 pr_warn("cannot register softnodes; rval %d\n", rval); 708 return; 709 } 710 711 test(full_name_second, "%pfw", software_node_fwnode(&second)); 712 test(full_name_third, "%pfw", software_node_fwnode(&third)); 713 test(full_name_third, "%pfwf", software_node_fwnode(&third)); 714 test(second_name, "%pfwP", software_node_fwnode(&second)); 715 test(third_name, "%pfwP", software_node_fwnode(&third)); 716 717 software_node_unregister_node_group(group); 718 } 719 720 static void __init fourcc_pointer(void) 721 { 722 struct { 723 u32 code; 724 char *str; 725 } const try[] = { 726 { 0x3231564e, "NV12 little-endian (0x3231564e)", }, 727 { 0xb231564e, "NV12 big-endian (0xb231564e)", }, 728 { 0x10111213, ".... little-endian (0x10111213)", }, 729 { 0x20303159, "Y10 little-endian (0x20303159)", }, 730 }; 731 unsigned int i; 732 733 for (i = 0; i < ARRAY_SIZE(try); i++) 734 test(try[i].str, "%p4cc", &try[i].code); 735 } 736 737 static void __init 738 errptr(void) 739 { 740 test("-1234", "%pe", ERR_PTR(-1234)); 741 742 /* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */ 743 BUILD_BUG_ON(IS_ERR(PTR)); 744 test_hashed("%pe", PTR); 745 746 #ifdef CONFIG_SYMBOLIC_ERRNAME 747 test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK)); 748 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN)); 749 BUILD_BUG_ON(EAGAIN != EWOULDBLOCK); 750 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK)); 751 test("[-EIO ]", "[%-8pe]", ERR_PTR(-EIO)); 752 test("[ -EIO]", "[%8pe]", ERR_PTR(-EIO)); 753 test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER)); 754 #endif 755 } 756 757 static void __init 758 test_pointer(void) 759 { 760 plain(); 761 null_pointer(); 762 error_pointer(); 763 invalid_pointer(); 764 symbol_ptr(); 765 kernel_ptr(); 766 struct_resource(); 767 addr(); 768 escaped_str(); 769 hex_string(); 770 mac(); 771 ip(); 772 uuid(); 773 dentry(); 774 struct_va_format(); 775 time_and_date(); 776 struct_clk(); 777 bitmap(); 778 netdev_features(); 779 flags(); 780 errptr(); 781 fwnode_pointer(); 782 fourcc_pointer(); 783 } 784 785 static void __init selftest(void) 786 { 787 alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL); 788 if (!alloced_buffer) 789 return; 790 test_buffer = alloced_buffer + PAD_SIZE; 791 792 test_basic(); 793 test_number(); 794 test_string(); 795 test_pointer(); 796 797 kfree(alloced_buffer); 798 } 799 800 KSTM_MODULE_LOADERS(test_printf); 801 MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>"); 802 MODULE_LICENSE("GPL"); 803