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 #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 = 1 + prandom_u32_max(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 #ifndef __CHAR_UNSIGNED__
 183         {
 184                 /*
 185                  * Passing a 'char' to a %02x specifier doesn't do
 186                  * what was presumably the intention when char is
 187                  * signed and the value is negative. One must either &
 188                  * with 0xff or cast to u8.
 189                  */
 190                 char val = -16;
 191                 test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val);
 192         }
 193 #endif
 194 }
 195
 196 static void __init
 197 test_string(void)
 198 {
 199         test("", "%s%.0s", "", "123");
 200         test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
 201         test("1  |  2|3  |  4|5  ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
 202         test("1234      ", "%-10.4s", "123456");
 203         test("      1234", "%10.4s", "123456");
 204         /*
 205          * POSIX and C99 say that a negative precision (which is only
 206          * possible to pass via a * argument) should be treated as if
 207          * the precision wasn't present, and that if the precision is
 208          * omitted (as in %.s), the precision should be taken to be
 209          * 0. However, the kernel's printf behave exactly opposite,
 210          * treating a negative precision as 0 and treating an omitted
 211          * precision specifier as if no precision was given.
 212          *
 213          * These test cases document the current behaviour; should
 214          * anyone ever feel the need to follow the standards more
 215          * closely, this can be revisited.
 216          */
 217         test("    ", "%4.*s", -5, "123456");
 218         test("123456", "%.s", "123456");
 219         test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
 220         test("a  |   |   ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
 221 }
 222
 223 #define PLAIN_BUF_SIZE 64       /* leave some space so we don't oops */
 224
 225 #if BITS_PER_LONG == 64
 226
 227 #define PTR_WIDTH 16
 228 #define PTR ((void *)0xffff0123456789abUL)
 229 #define PTR_STR "ffff0123456789ab"
 230 #define PTR_VAL_NO_CRNG "(____ptrval____)"
 231 #define ZEROS "00000000"        /* hex 32 zero bits */
 232 #define ONES "ffffffff"         /* hex 32 one bits */
 233
 234 static int __init
 235 plain_format(void)
 236 {
 237         char buf[PLAIN_BUF_SIZE];
 238         int nchars;
 239
 240         nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
 241
 242         if (nchars != PTR_WIDTH)
 243                 return -1;
 244
 245         if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
 246                 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
 247                         PTR_VAL_NO_CRNG);
 248                 return 0;
 249         }
 250
 251         if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
 252                 return -1;
 253
 254         return 0;
 255 }
 256
 257 #else
 258
 259 #define PTR_WIDTH 8
 260 #define PTR ((void *)0x456789ab)
 261 #define PTR_STR "456789ab"
 262 #define PTR_VAL_NO_CRNG "(ptrval)"
 263 #define ZEROS ""
 264 #define ONES ""
 265
 266 static int __init
 267 plain_format(void)
 268 {
 269         /* Format is implicitly tested for 32 bit machines by plain_hash() */
 270         return 0;
 271 }
 272
 273 #endif  /* BITS_PER_LONG == 64 */
 274
 275 static int __init
 276 plain_hash_to_buffer(const void *p, char *buf, size_t len)
 277 {
 278         int nchars;
 279
 280         nchars = snprintf(buf, len, "%p", p);
 281
 282         if (nchars != PTR_WIDTH)
 283                 return -1;
 284
 285         if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
 286                 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
 287                         PTR_VAL_NO_CRNG);
 288                 return 0;
 289         }
 290
 291         return 0;
 292 }
 293
 294 static int __init
 295 plain_hash(void)
 296 {
 297         char buf[PLAIN_BUF_SIZE];
 298         int ret;
 299
 300         ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE);
 301         if (ret)
 302                 return ret;
 303
 304         if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
 305                 return -1;
 306
 307         return 0;
 308 }
 309
 310 /*
 311  * We can't use test() to test %p because we don't know what output to expect
 312  * after an address is hashed.
 313  */
 314 static void __init
 315 plain(void)
 316 {
 317         int err;
 318
 319         if (no_hash_pointers) {
 320                 pr_warn("skipping plain 'p' tests");
 321                 skipped_tests += 2;
 322                 return;
 323         }
 324
 325         err = plain_hash();
 326         if (err) {
 327                 pr_warn("plain 'p' does not appear to be hashed\n");
 328                 failed_tests++;
 329                 return;
 330         }
 331
 332         err = plain_format();
 333         if (err) {
 334                 pr_warn("hashing plain 'p' has unexpected format\n");
 335                 failed_tests++;
 336         }
 337 }
 338
 339 static void __init
 340 test_hashed(const char *fmt, const void *p)
 341 {
 342         char buf[PLAIN_BUF_SIZE];
 343         int ret;
 344
 345         /*
 346          * No need to increase failed test counter since this is assumed
 347          * to be called after plain().
 348          */
 349         ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE);
 350         if (ret)
 351                 return;
 352
 353         test(buf, fmt, p);
 354 }
 355
 356 /*
 357  * NULL pointers aren't hashed.
 358  */
 359 static void __init
 360 null_pointer(void)
 361 {
 362         test(ZEROS "00000000", "%p", NULL);
 363         test(ZEROS "00000000", "%px", NULL);
 364         test("(null)", "%pE", NULL);
 365 }
 366
 367 /*
 368  * Error pointers aren't hashed.
 369  */
 370 static void __init
 371 error_pointer(void)
 372 {
 373         test(ONES "fffffff5", "%p", ERR_PTR(-11));
 374         test(ONES "fffffff5", "%px", ERR_PTR(-11));
 375         test("(efault)", "%pE", ERR_PTR(-11));
 376 }
 377
 378 #define PTR_INVALID ((void *)0x000000ab)
 379
 380 static void __init
 381 invalid_pointer(void)
 382 {
 383         test_hashed("%p", PTR_INVALID);
 384         test(ZEROS "000000ab", "%px", PTR_INVALID);
 385         test("(efault)", "%pE", PTR_INVALID);
 386 }
 387
 388 static void __init
 389 symbol_ptr(void)
 390 {
 391 }
 392
 393 static void __init
 394 kernel_ptr(void)
 395 {
 396         /* We can't test this without access to kptr_restrict. */
 397 }
 398
 399 static void __init
 400 struct_resource(void)
 401 {
 402 }
 403
 404 static void __init
 405 addr(void)
 406 {
 407 }
 408
 409 static void __init
 410 escaped_str(void)
 411 {
 412 }
 413
 414 static void __init
 415 hex_string(void)
 416 {
 417         const char buf[3] = {0xc0, 0xff, 0xee};
 418
 419         test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
 420              "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
 421         test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
 422              "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
 423 }
 424
 425 static void __init
 426 mac(void)
 427 {
 428         const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
 429
 430         test("2d:48:d6:fc:7a:05", "%pM", addr);
 431         test("05:7a:fc:d6:48:2d", "%pMR", addr);
 432         test("2d-48-d6-fc-7a-05", "%pMF", addr);
 433         test("2d48d6fc7a05", "%pm", addr);
 434         test("057afcd6482d", "%pmR", addr);
 435 }
 436
 437 static void __init
 438 ip4(void)
 439 {
 440         struct sockaddr_in sa;
 441
 442         sa.sin_family = AF_INET;
 443         sa.sin_port = cpu_to_be16(12345);
 444         sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
 445
 446         test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
 447         test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
 448         sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
 449         test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
 450 }
 451
 452 static void __init
 453 ip6(void)
 454 {
 455 }
 456
 457 static void __init
 458 ip(void)
 459 {
 460         ip4();
 461         ip6();
 462 }
 463
 464 static void __init
 465 uuid(void)
 466 {
 467         const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
 468                                0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
 469
 470         test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
 471         test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
 472         test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
 473         test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
 474 }
 475
 476 static struct dentry test_dentry[4] __initdata = {
 477         { .d_parent = &test_dentry[0],
 478           .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
 479           .d_iname = "foo" },
 480         { .d_parent = &test_dentry[0],
 481           .d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
 482           .d_iname = "bravo" },
 483         { .d_parent = &test_dentry[1],
 484           .d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
 485           .d_iname = "alfa" },
 486         { .d_parent = &test_dentry[2],
 487           .d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
 488           .d_iname = "romeo" },
 489 };
 490
 491 static void __init
 492 dentry(void)
 493 {
 494         test("foo", "%pd", &test_dentry[0]);
 495         test("foo", "%pd2", &test_dentry[0]);
 496
 497         test("(null)", "%pd", NULL);
 498         test("(efault)", "%pd", PTR_INVALID);
 499         test("(null)", "%pD", NULL);
 500         test("(efault)", "%pD", PTR_INVALID);
 501
 502         test("romeo", "%pd", &test_dentry[3]);
 503         test("alfa/romeo", "%pd2", &test_dentry[3]);
 504         test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
 505         test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
 506         test("/bravo/alfa", "%pd4", &test_dentry[2]);
 507
 508         test("bravo/alfa  |bravo/alfa  ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
 509         test("  bravo/alfa|  bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
 510 }
 511
 512 static void __init
 513 struct_va_format(void)
 514 {
 515 }
 516
 517 static void __init
 518 time_and_date(void)
 519 {
 520         /* 1543210543 */
 521         const struct rtc_time tm = {
 522                 .tm_sec = 43,
 523                 .tm_min = 35,
 524                 .tm_hour = 5,
 525                 .tm_mday = 26,
 526                 .tm_mon = 10,
 527                 .tm_year = 118,
 528         };
 529         /* 2019-01-04T15:32:23 */
 530         time64_t t = 1546615943;
 531
 532         test("(%pt?)", "%pt", &tm);
 533         test("2018-11-26T05:35:43", "%ptR", &tm);
 534         test("0118-10-26T05:35:43", "%ptRr", &tm);
 535         test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
 536         test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
 537         test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
 538         test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);
 539
 540         test("2019-01-04T15:32:23", "%ptT", &t);
 541         test("0119-00-04T15:32:23", "%ptTr", &t);
 542         test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t);
 543         test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t);
 544
 545         test("2019-01-04 15:32:23", "%ptTs", &t);
 546         test("0119-00-04 15:32:23", "%ptTsr", &t);
 547         test("15:32:23|2019-01-04", "%ptTts|%ptTds", &t, &t);
 548         test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t);
 549 }
 550
 551 static void __init
 552 struct_clk(void)
 553 {
 554 }
 555
 556 static void __init
 557 large_bitmap(void)
 558 {
 559         const int nbits = 1 << 16;
 560         unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
 561         if (!bits)
 562                 return;
 563
 564         bitmap_set(bits, 1, 20);
 565         bitmap_set(bits, 60000, 15);
 566         test("1-20,60000-60014", "%*pbl", nbits, bits);
 567         bitmap_free(bits);
 568 }
 569
 570 static void __init
 571 bitmap(void)
 572 {
 573         DECLARE_BITMAP(bits, 20);
 574         const int primes[] = {2,3,5,7,11,13,17,19};
 575         int i;
 576
 577         bitmap_zero(bits, 20);
 578         test("00000|00000", "%20pb|%*pb", bits, 20, bits);
 579         test("|", "%20pbl|%*pbl", bits, 20, bits);
 580
 581         for (i = 0; i < ARRAY_SIZE(primes); ++i)
 582                 set_bit(primes[i], bits);
 583         test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
 584         test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
 585
 586         bitmap_fill(bits, 20);
 587         test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
 588         test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
 589
 590         large_bitmap();
 591 }
 592
 593 static void __init
 594 netdev_features(void)
 595 {
 596 }
 597
 598 struct page_flags_test {
 599         int width;
 600         int shift;
 601         int mask;
 602         const char *fmt;
 603         const char *name;
 604 };
 605
 606 static const struct page_flags_test pft[] = {
 607         {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
 608          "%d", "section"},
 609         {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
 610          "%d", "node"},
 611         {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
 612          "%d", "zone"},
 613         {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
 614          "%#x", "lastcpupid"},
 615         {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
 616          "%#x", "kasantag"},
 617 };
 618
 619 static void __init
 620 page_flags_test(int section, int node, int zone, int last_cpupid,
 621                 int kasan_tag, unsigned long flags, const char *name,
 622                 char *cmp_buf)
 623 {
 624         unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag};
 625         unsigned long size;
 626         bool append = false;
 627         int i;
 628
 629         for (i = 0; i < ARRAY_SIZE(values); i++)
 630                 flags |= (values[i] & pft[i].mask) << pft[i].shift;
 631
 632         size = scnprintf(cmp_buf, BUF_SIZE, "%#lx(", flags);
 633         if (flags & PAGEFLAGS_MASK) {
 634                 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
 635                 append = true;
 636         }
 637
 638         for (i = 0; i < ARRAY_SIZE(pft); i++) {
 639                 if (!pft[i].width)
 640                         continue;
 641
 642                 if (append)
 643                         size += scnprintf(cmp_buf + size, BUF_SIZE - size, "|");
 644
 645                 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s=",
 646                                 pft[i].name);
 647                 size += scnprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
 648                                 values[i] & pft[i].mask);
 649                 append = true;
 650         }
 651
 652         snprintf(cmp_buf + size, BUF_SIZE - size, ")");
 653
 654         test(cmp_buf, "%pGp", &flags);
 655 }
 656
 657 static void __init
 658 flags(void)
 659 {
 660         unsigned long flags;
 661         char *cmp_buffer;
 662         gfp_t gfp;
 663
 664         cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
 665         if (!cmp_buffer)
 666                 return;
 667
 668         flags = 0;
 669         page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
 670
 671         flags = 1UL << NR_PAGEFLAGS;
 672         page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
 673
 674         flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
 675                 | 1UL << PG_active | 1UL << PG_swapbacked;
 676         page_flags_test(1, 1, 1, 0x1fffff, 1, flags,
 677                         "uptodate|dirty|lru|active|swapbacked",
 678                         cmp_buffer);
 679
 680         flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
 681         test("read|exec|mayread|maywrite|mayexec", "%pGv", &flags);
 682
 683         gfp = GFP_TRANSHUGE;
 684         test("GFP_TRANSHUGE", "%pGg", &gfp);
 685
 686         gfp = GFP_ATOMIC|__GFP_DMA;
 687         test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
 688
 689         gfp = __GFP_ATOMIC;
 690         test("__GFP_ATOMIC", "%pGg", &gfp);
 691
 692         /* Any flags not translated by the table should remain numeric */
 693         gfp = ~__GFP_BITS_MASK;
 694         snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
 695         test(cmp_buffer, "%pGg", &gfp);
 696
 697         snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
 698                                                         (unsigned long) gfp);
 699         gfp |= __GFP_ATOMIC;
 700         test(cmp_buffer, "%pGg", &gfp);
 701
 702         kfree(cmp_buffer);
 703 }
 704
 705 static void __init fwnode_pointer(void)
 706 {
 707         const struct software_node softnodes[] = {
 708                 { .name = "first", },
 709                 { .name = "second", .parent = &softnodes[0], },
 710                 { .name = "third", .parent = &softnodes[1], },
 711                 { NULL /* Guardian */ }
 712         };
 713         const char * const full_name = "first/second/third";
 714         const char * const full_name_second = "first/second";
 715         const char * const second_name = "second";
 716         const char * const third_name = "third";
 717         int rval;
 718
 719         rval = software_node_register_nodes(softnodes);
 720         if (rval) {
 721                 pr_warn("cannot register softnodes; rval %d\n", rval);
 722                 return;
 723         }
 724
 725         test(full_name_second, "%pfw", software_node_fwnode(&softnodes[1]));
 726         test(full_name, "%pfw", software_node_fwnode(&softnodes[2]));
 727         test(full_name, "%pfwf", software_node_fwnode(&softnodes[2]));
 728         test(second_name, "%pfwP", software_node_fwnode(&softnodes[1]));
 729         test(third_name, "%pfwP", software_node_fwnode(&softnodes[2]));
 730
 731         software_node_unregister_nodes(softnodes);
 732 }
 733
 734 static void __init fourcc_pointer(void)
 735 {
 736         struct {
 737                 u32 code;
 738                 char *str;
 739         } const try[] = {
 740                 { 0x3231564e, "NV12 little-endian (0x3231564e)", },
 741                 { 0xb231564e, "NV12 big-endian (0xb231564e)", },
 742                 { 0x10111213, ".... little-endian (0x10111213)", },
 743                 { 0x20303159, "Y10  little-endian (0x20303159)", },
 744         };
 745         unsigned int i;
 746
 747         for (i = 0; i < ARRAY_SIZE(try); i++)
 748                 test(try[i].str, "%p4cc", &try[i].code);
 749 }
 750
 751 static void __init
 752 errptr(void)
 753 {
 754         test("-1234", "%pe", ERR_PTR(-1234));
 755
 756         /* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
 757         BUILD_BUG_ON(IS_ERR(PTR));
 758         test_hashed("%pe", PTR);
 759
 760 #ifdef CONFIG_SYMBOLIC_ERRNAME
 761         test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
 762         test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
 763         BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
 764         test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
 765         test("[-EIO    ]", "[%-8pe]", ERR_PTR(-EIO));
 766         test("[    -EIO]", "[%8pe]", ERR_PTR(-EIO));
 767         test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
 768 #endif
 769 }
 770
 771 static void __init
 772 test_pointer(void)
 773 {
 774         plain();
 775         null_pointer();
 776         error_pointer();
 777         invalid_pointer();
 778         symbol_ptr();
 779         kernel_ptr();
 780         struct_resource();
 781         addr();
 782         escaped_str();
 783         hex_string();
 784         mac();
 785         ip();
 786         uuid();
 787         dentry();
 788         struct_va_format();
 789         time_and_date();
 790         struct_clk();
 791         bitmap();
 792         netdev_features();
 793         flags();
 794         errptr();
 795         fwnode_pointer();
 796         fourcc_pointer();
 797 }
 798
 799 static void __init selftest(void)
 800 {
 801         alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
 802         if (!alloced_buffer)
 803                 return;
 804         test_buffer = alloced_buffer + PAD_SIZE;
 805
 806         test_basic();
 807         test_number();
 808         test_string();
 809         test_pointer();
 810
 811         kfree(alloced_buffer);
 812 }
 813
 814 KSTM_MODULE_LOADERS(test_printf);
 815 MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
 816 MODULE_LICENSE("GPL");