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