lib/test_printf.c

   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         unsigned long value;
 590         const char *fmt;
 591         const char *name;
 592 };
 593
 594 static struct page_flags_test pft[] = {
 595         {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
 596          0, "%d", "section"},
 597         {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
 598          0, "%d", "node"},
 599         {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
 600          0, "%d", "zone"},
 601         {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
 602          0, "%#x", "lastcpupid"},
 603         {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
 604          0, "%#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, int flags, const char *name, char *cmp_buf)
 610 {
 611         unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag};
 612         unsigned long page_flags = 0;
 613         unsigned long size = 0;
 614         bool append = false;
 615         int i;
 616
 617         flags &= PAGEFLAGS_MASK;
 618         if (flags) {
 619                 page_flags |= flags;
 620                 snprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
 621                 size = strlen(cmp_buf);
 622 #if SECTIONS_WIDTH || NODES_WIDTH || ZONES_WIDTH || \
 623         LAST_CPUPID_WIDTH || KASAN_TAG_WIDTH
 624                 /* Other information also included in page flags */
 625                 snprintf(cmp_buf + size, BUF_SIZE - size, "|");
 626                 size = strlen(cmp_buf);
 627 #endif
 628         }
 629
 630         /* Set the test value */
 631         for (i = 0; i < ARRAY_SIZE(pft); i++)
 632                 pft[i].value = values[i];
 633
 634         for (i = 0; i < ARRAY_SIZE(pft); i++) {
 635                 if (!pft[i].width)
 636                         continue;
 637
 638                 if (append) {
 639                         snprintf(cmp_buf + size, BUF_SIZE - size, "|");
 640                         size = strlen(cmp_buf);
 641                 }
 642
 643                 page_flags |= (pft[i].value & pft[i].mask) << pft[i].shift;
 644                 snprintf(cmp_buf + size, BUF_SIZE - size, "%s=", pft[i].name);
 645                 size = strlen(cmp_buf);
 646                 snprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
 647                          pft[i].value & pft[i].mask);
 648                 size = strlen(cmp_buf);
 649                 append = true;
 650         }
 651
 652         test(cmp_buf, "%pGp", &page_flags);
 653 }
 654
 655 static void __init
 656 flags(void)
 657 {
 658         unsigned long flags;
 659         char *cmp_buffer;
 660         gfp_t gfp;
 661
 662         cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
 663         if (!cmp_buffer)
 664                 return;
 665
 666         flags = 0;
 667         page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
 668
 669         flags = 1UL << NR_PAGEFLAGS;
 670         page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
 671
 672         flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
 673                 | 1UL << PG_active | 1UL << PG_swapbacked;
 674         page_flags_test(1, 1, 1, 0x1fffff, 1, flags,
 675                         "uptodate|dirty|lru|active|swapbacked",
 676                         cmp_buffer);
 677
 678         flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
 679         test("read|exec|mayread|maywrite|mayexec", "%pGv", &flags);
 680
 681         gfp = GFP_TRANSHUGE;
 682         test("GFP_TRANSHUGE", "%pGg", &gfp);
 683
 684         gfp = GFP_ATOMIC|__GFP_DMA;
 685         test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
 686
 687         gfp = __GFP_ATOMIC;
 688         test("__GFP_ATOMIC", "%pGg", &gfp);
 689
 690         /* Any flags not translated by the table should remain numeric */
 691         gfp = ~__GFP_BITS_MASK;
 692         snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
 693         test(cmp_buffer, "%pGg", &gfp);
 694
 695         snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
 696                                                         (unsigned long) gfp);
 697         gfp |= __GFP_ATOMIC;
 698         test(cmp_buffer, "%pGg", &gfp);
 699
 700         kfree(cmp_buffer);
 701 }
 702
 703 static void __init fwnode_pointer(void)
 704 {
 705         const struct software_node softnodes[] = {
 706                 { .name = "first", },
 707                 { .name = "second", .parent = &softnodes[0], },
 708                 { .name = "third", .parent = &softnodes[1], },
 709                 { NULL /* Guardian */ }
 710         };
 711         const char * const full_name = "first/second/third";
 712         const char * const full_name_second = "first/second";
 713         const char * const second_name = "second";
 714         const char * const third_name = "third";
 715         int rval;
 716
 717         rval = software_node_register_nodes(softnodes);
 718         if (rval) {
 719                 pr_warn("cannot register softnodes; rval %d\n", rval);
 720                 return;
 721         }
 722
 723         test(full_name_second, "%pfw", software_node_fwnode(&softnodes[1]));
 724         test(full_name, "%pfw", software_node_fwnode(&softnodes[2]));
 725         test(full_name, "%pfwf", software_node_fwnode(&softnodes[2]));
 726         test(second_name, "%pfwP", software_node_fwnode(&softnodes[1]));
 727         test(third_name, "%pfwP", software_node_fwnode(&softnodes[2]));
 728
 729         software_node_unregister_nodes(softnodes);
 730 }
 731
 732 static void __init fourcc_pointer(void)
 733 {
 734         struct {
 735                 u32 code;
 736                 char *str;
 737         } const try[] = {
 738                 { 0x3231564e, "NV12 little-endian (0x3231564e)", },
 739                 { 0xb231564e, "NV12 big-endian (0xb231564e)", },
 740                 { 0x10111213, ".... little-endian (0x10111213)", },
 741                 { 0x20303159, "Y10  little-endian (0x20303159)", },
 742         };
 743         unsigned int i;
 744
 745         for (i = 0; i < ARRAY_SIZE(try); i++)
 746                 test(try[i].str, "%p4cc", &try[i].code);
 747 }
 748
 749 static void __init
 750 errptr(void)
 751 {
 752         test("-1234", "%pe", ERR_PTR(-1234));
 753
 754         /* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
 755         BUILD_BUG_ON(IS_ERR(PTR));
 756         test_hashed("%pe", PTR);
 757
 758 #ifdef CONFIG_SYMBOLIC_ERRNAME
 759         test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
 760         test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
 761         BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
 762         test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
 763         test("[-EIO    ]", "[%-8pe]", ERR_PTR(-EIO));
 764         test("[    -EIO]", "[%8pe]", ERR_PTR(-EIO));
 765         test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
 766 #endif
 767 }
 768
 769 static void __init
 770 test_pointer(void)
 771 {
 772         plain();
 773         null_pointer();
 774         error_pointer();
 775         invalid_pointer();
 776         symbol_ptr();
 777         kernel_ptr();
 778         struct_resource();
 779         addr();
 780         escaped_str();
 781         hex_string();
 782         mac();
 783         ip();
 784         uuid();
 785         dentry();
 786         struct_va_format();
 787         time_and_date();
 788         struct_clk();
 789         bitmap();
 790         netdev_features();
 791         flags();
 792         errptr();
 793         fwnode_pointer();
 794         fourcc_pointer();
 795 }
 796
 797 static void __init selftest(void)
 798 {
 799         alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
 800         if (!alloced_buffer)
 801                 return;
 802         test_buffer = alloced_buffer + PAD_SIZE;
 803
 804         test_basic();
 805         test_number();
 806         test_string();
 807         test_pointer();
 808
 809         kfree(alloced_buffer);
 810 }
 811
 812 KSTM_MODULE_LOADERS(test_printf);
 813 MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
 814 MODULE_LICENSE("GPL");