lib/test_printf.c

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This source file includes following definitions.
__printf
__printf
test_basic
test_number
test_string
plain_format
plain_format
plain_hash_to_buffer
plain_hash
plain
test_hashed
null_pointer
error_pointer
invalid_pointer
symbol_ptr
kernel_ptr
struct_resource
addr
escaped_str
hex_string
mac
ip4
ip6
ip
uuid
dentry
struct_va_format
struct_rtc_time
struct_clk
large_bitmap
bitmap
netdev_features
flags
test_pointer
selftest
   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 "../tools/testing/selftests/kselftest_module.h"
  26 
  27 #define BUF_SIZE 256
  28 #define PAD_SIZE 16
  29 #define FILL_CHAR '$'
  30 
  31 static unsigned total_tests __initdata;
  32 static unsigned failed_tests __initdata;
  33 static char *test_buffer __initdata;
  34 static char *alloced_buffer __initdata;
  35 
  36 static int __printf(4, 0) __init
  37 do_test(int bufsize, const char *expect, int elen,
  38         const char *fmt, va_list ap)
  39 {
  40         va_list aq;
  41         int ret, written;
  42 
  43         total_tests++;
  44 
  45         memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
  46         va_copy(aq, ap);
  47         ret = vsnprintf(test_buffer, bufsize, fmt, aq);
  48         va_end(aq);
  49 
  50         if (ret != elen) {
  51                 pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
  52                         bufsize, fmt, ret, elen);
  53                 return 1;
  54         }
  55 
  56         if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
  57                 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
  58                 return 1;
  59         }
  60 
  61         if (!bufsize) {
  62                 if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
  63                         pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
  64                                 fmt);
  65                         return 1;
  66                 }
  67                 return 0;
  68         }
  69 
  70         written = min(bufsize-1, elen);
  71         if (test_buffer[written]) {
  72                 pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
  73                         bufsize, fmt);
  74                 return 1;
  75         }
  76 
  77         if (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
  78                 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
  79                         bufsize, fmt);
  80                 return 1;
  81         }
  82 
  83         if (memcmp(test_buffer, expect, written)) {
  84                 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
  85                         bufsize, fmt, test_buffer, written, expect);
  86                 return 1;
  87         }
  88         return 0;
  89 }
  90 
  91 static void __printf(3, 4) __init
  92 __test(const char *expect, int elen, const char *fmt, ...)
  93 {
  94         va_list ap;
  95         int rand;
  96         char *p;
  97 
  98         if (elen >= BUF_SIZE) {
  99                 pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
 100                        elen, fmt);
 101                 failed_tests++;
 102                 return;
 103         }
 104 
 105         va_start(ap, fmt);
 106 
 107         /*
 108          * Every fmt+args is subjected to four tests: Three where we
 109          * tell vsnprintf varying buffer sizes (plenty, not quite
 110          * enough and 0), and then we also test that kvasprintf would
 111          * be able to print it as expected.
 112          */
 113         failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
 114         rand = 1 + prandom_u32_max(elen+1);
 115         /* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
 116         failed_tests += do_test(rand, expect, elen, fmt, ap);
 117         failed_tests += do_test(0, expect, elen, fmt, ap);
 118 
 119         p = kvasprintf(GFP_KERNEL, fmt, ap);
 120         if (p) {
 121                 total_tests++;
 122                 if (memcmp(p, expect, elen+1)) {
 123                         pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
 124                                 fmt, p, expect);
 125                         failed_tests++;
 126                 }
 127                 kfree(p);
 128         }
 129         va_end(ap);
 130 }
 131 
 132 #define test(expect, fmt, ...)                                  \
 133         __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
 134 
 135 static void __init
 136 test_basic(void)
 137 {
 138         /* Work around annoying "warning: zero-length gnu_printf format string". */
 139         char nul = '\0';
 140 
 141         test("", &nul);
 142         test("100%", "100%%");
 143         test("xxx%yyy", "xxx%cyyy", '%');
 144         __test("xxx\0yyy", 7, "xxx%cyyy", '\0');
 145 }
 146 
 147 static void __init
 148 test_number(void)
 149 {
 150         test("0x1234abcd  ", "%#-12x", 0x1234abcd);
 151         test("  0x1234abcd", "%#12x", 0x1234abcd);
 152         test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
 153         test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
 154         test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
 155         test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
 156         /*
 157          * POSIX/C99: »The result of converting zero with an explicit
 158          * precision of zero shall be no characters.« Hence the output
 159          * from the below test should really be "00|0||| ". However,
 160          * the kernel's printf also produces a single 0 in that
 161          * case. This test case simply documents the current
 162          * behaviour.
 163          */
 164         test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
 165 #ifndef __CHAR_UNSIGNED__
 166         {
 167                 /*
 168                  * Passing a 'char' to a %02x specifier doesn't do
 169                  * what was presumably the intention when char is
 170                  * signed and the value is negative. One must either &
 171                  * with 0xff or cast to u8.
 172                  */
 173                 char val = -16;
 174                 test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val);
 175         }
 176 #endif
 177 }
 178 
 179 static void __init
 180 test_string(void)
 181 {
 182         test("", "%s%.0s", "", "123");
 183         test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
 184         test("1  |  2|3  |  4|5  ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
 185         test("1234      ", "%-10.4s", "123456");
 186         test("      1234", "%10.4s", "123456");
 187         /*
 188          * POSIX and C99 say that a negative precision (which is only
 189          * possible to pass via a * argument) should be treated as if
 190          * the precision wasn't present, and that if the precision is
 191          * omitted (as in %.s), the precision should be taken to be
 192          * 0. However, the kernel's printf behave exactly opposite,
 193          * treating a negative precision as 0 and treating an omitted
 194          * precision specifier as if no precision was given.
 195          *
 196          * These test cases document the current behaviour; should
 197          * anyone ever feel the need to follow the standards more
 198          * closely, this can be revisited.
 199          */
 200         test("    ", "%4.*s", -5, "123456");
 201         test("123456", "%.s", "123456");
 202         test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
 203         test("a  |   |   ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
 204 }
 205 
 206 #define PLAIN_BUF_SIZE 64       /* leave some space so we don't oops */
 207 
 208 #if BITS_PER_LONG == 64
 209 
 210 #define PTR_WIDTH 16
 211 #define PTR ((void *)0xffff0123456789abUL)
 212 #define PTR_STR "ffff0123456789ab"
 213 #define PTR_VAL_NO_CRNG "(____ptrval____)"
 214 #define ZEROS "00000000"        /* hex 32 zero bits */
 215 #define ONES "ffffffff"         /* hex 32 one bits */
 216 
 217 static int __init
 218 plain_format(void)
 219 {
 220         char buf[PLAIN_BUF_SIZE];
 221         int nchars;
 222 
 223         nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
 224 
 225         if (nchars != PTR_WIDTH)
 226                 return -1;
 227 
 228         if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
 229                 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
 230                         PTR_VAL_NO_CRNG);
 231                 return 0;
 232         }
 233 
 234         if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
 235                 return -1;
 236 
 237         return 0;
 238 }
 239 
 240 #else
 241 
 242 #define PTR_WIDTH 8
 243 #define PTR ((void *)0x456789ab)
 244 #define PTR_STR "456789ab"
 245 #define PTR_VAL_NO_CRNG "(ptrval)"
 246 #define ZEROS ""
 247 #define ONES ""
 248 
 249 static int __init
 250 plain_format(void)
 251 {
 252         /* Format is implicitly tested for 32 bit machines by plain_hash() */
 253         return 0;
 254 }
 255 
 256 #endif  /* BITS_PER_LONG == 64 */
 257 
 258 static int __init
 259 plain_hash_to_buffer(const void *p, char *buf, size_t len)
 260 {
 261         int nchars;
 262 
 263         nchars = snprintf(buf, len, "%p", p);
 264 
 265         if (nchars != PTR_WIDTH)
 266                 return -1;
 267 
 268         if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
 269                 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
 270                         PTR_VAL_NO_CRNG);
 271                 return 0;
 272         }
 273 
 274         return 0;
 275 }
 276 
 277 static int __init
 278 plain_hash(void)
 279 {
 280         char buf[PLAIN_BUF_SIZE];
 281         int ret;
 282 
 283         ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE);
 284         if (ret)
 285                 return ret;
 286 
 287         if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
 288                 return -1;
 289 
 290         return 0;
 291 }
 292 
 293 /*
 294  * We can't use test() to test %p because we don't know what output to expect
 295  * after an address is hashed.
 296  */
 297 static void __init
 298 plain(void)
 299 {
 300         int err;
 301 
 302         err = plain_hash();
 303         if (err) {
 304                 pr_warn("plain 'p' does not appear to be hashed\n");
 305                 failed_tests++;
 306                 return;
 307         }
 308 
 309         err = plain_format();
 310         if (err) {
 311                 pr_warn("hashing plain 'p' has unexpected format\n");
 312                 failed_tests++;
 313         }
 314 }
 315 
 316 static void __init
 317 test_hashed(const char *fmt, const void *p)
 318 {
 319         char buf[PLAIN_BUF_SIZE];
 320         int ret;
 321 
 322         /*
 323          * No need to increase failed test counter since this is assumed
 324          * to be called after plain().
 325          */
 326         ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE);
 327         if (ret)
 328                 return;
 329 
 330         test(buf, fmt, p);
 331 }
 332 
 333 /*
 334  * NULL pointers aren't hashed.
 335  */
 336 static void __init
 337 null_pointer(void)
 338 {
 339         test(ZEROS "00000000", "%p", NULL);
 340         test(ZEROS "00000000", "%px", NULL);
 341         test("(null)", "%pE", NULL);
 342 }
 343 
 344 /*
 345  * Error pointers aren't hashed.
 346  */
 347 static void __init
 348 error_pointer(void)
 349 {
 350         test(ONES "fffffff5", "%p", ERR_PTR(-11));
 351         test(ONES "fffffff5", "%px", ERR_PTR(-11));
 352         test("(efault)", "%pE", ERR_PTR(-11));
 353 }
 354 
 355 #define PTR_INVALID ((void *)0x000000ab)
 356 
 357 static void __init
 358 invalid_pointer(void)
 359 {
 360         test_hashed("%p", PTR_INVALID);
 361         test(ZEROS "000000ab", "%px", PTR_INVALID);
 362         test("(efault)", "%pE", PTR_INVALID);
 363 }
 364 
 365 static void __init
 366 symbol_ptr(void)
 367 {
 368 }
 369 
 370 static void __init
 371 kernel_ptr(void)
 372 {
 373         /* We can't test this without access to kptr_restrict. */
 374 }
 375 
 376 static void __init
 377 struct_resource(void)
 378 {
 379 }
 380 
 381 static void __init
 382 addr(void)
 383 {
 384 }
 385 
 386 static void __init
 387 escaped_str(void)
 388 {
 389 }
 390 
 391 static void __init
 392 hex_string(void)
 393 {
 394         const char buf[3] = {0xc0, 0xff, 0xee};
 395 
 396         test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
 397              "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
 398         test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
 399              "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
 400 }
 401 
 402 static void __init
 403 mac(void)
 404 {
 405         const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
 406 
 407         test("2d:48:d6:fc:7a:05", "%pM", addr);
 408         test("05:7a:fc:d6:48:2d", "%pMR", addr);
 409         test("2d-48-d6-fc-7a-05", "%pMF", addr);
 410         test("2d48d6fc7a05", "%pm", addr);
 411         test("057afcd6482d", "%pmR", addr);
 412 }
 413 
 414 static void __init
 415 ip4(void)
 416 {
 417         struct sockaddr_in sa;
 418 
 419         sa.sin_family = AF_INET;
 420         sa.sin_port = cpu_to_be16(12345);
 421         sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
 422 
 423         test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
 424         test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
 425         sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
 426         test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
 427 }
 428 
 429 static void __init
 430 ip6(void)
 431 {
 432 }
 433 
 434 static void __init
 435 ip(void)
 436 {
 437         ip4();
 438         ip6();
 439 }
 440 
 441 static void __init
 442 uuid(void)
 443 {
 444         const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
 445                                0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
 446 
 447         test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
 448         test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
 449         test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
 450         test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
 451 }
 452 
 453 static struct dentry test_dentry[4] __initdata = {
 454         { .d_parent = &test_dentry[0],
 455           .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
 456           .d_iname = "foo" },
 457         { .d_parent = &test_dentry[0],
 458           .d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
 459           .d_iname = "bravo" },
 460         { .d_parent = &test_dentry[1],
 461           .d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
 462           .d_iname = "alfa" },
 463         { .d_parent = &test_dentry[2],
 464           .d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
 465           .d_iname = "romeo" },
 466 };
 467 
 468 static void __init
 469 dentry(void)
 470 {
 471         test("foo", "%pd", &test_dentry[0]);
 472         test("foo", "%pd2", &test_dentry[0]);
 473 
 474         test("(null)", "%pd", NULL);
 475         test("(efault)", "%pd", PTR_INVALID);
 476         test("(null)", "%pD", NULL);
 477         test("(efault)", "%pD", PTR_INVALID);
 478 
 479         test("romeo", "%pd", &test_dentry[3]);
 480         test("alfa/romeo", "%pd2", &test_dentry[3]);
 481         test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
 482         test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
 483         test("/bravo/alfa", "%pd4", &test_dentry[2]);
 484 
 485         test("bravo/alfa  |bravo/alfa  ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
 486         test("  bravo/alfa|  bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
 487 }
 488 
 489 static void __init
 490 struct_va_format(void)
 491 {
 492 }
 493 
 494 static void __init
 495 struct_rtc_time(void)
 496 {
 497         /* 1543210543 */
 498         const struct rtc_time tm = {
 499                 .tm_sec = 43,
 500                 .tm_min = 35,
 501                 .tm_hour = 5,
 502                 .tm_mday = 26,
 503                 .tm_mon = 10,
 504                 .tm_year = 118,
 505         };
 506 
 507         test("(%ptR?)", "%pt", &tm);
 508         test("2018-11-26T05:35:43", "%ptR", &tm);
 509         test("0118-10-26T05:35:43", "%ptRr", &tm);
 510         test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
 511         test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
 512         test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
 513         test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);
 514 }
 515 
 516 static void __init
 517 struct_clk(void)
 518 {
 519 }
 520 
 521 static void __init
 522 large_bitmap(void)
 523 {
 524         const int nbits = 1 << 16;
 525         unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
 526         if (!bits)
 527                 return;
 528 
 529         bitmap_set(bits, 1, 20);
 530         bitmap_set(bits, 60000, 15);
 531         test("1-20,60000-60014", "%*pbl", nbits, bits);
 532         bitmap_free(bits);
 533 }
 534 
 535 static void __init
 536 bitmap(void)
 537 {
 538         DECLARE_BITMAP(bits, 20);
 539         const int primes[] = {2,3,5,7,11,13,17,19};
 540         int i;
 541 
 542         bitmap_zero(bits, 20);
 543         test("00000|00000", "%20pb|%*pb", bits, 20, bits);
 544         test("|", "%20pbl|%*pbl", bits, 20, bits);
 545 
 546         for (i = 0; i < ARRAY_SIZE(primes); ++i)
 547                 set_bit(primes[i], bits);
 548         test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
 549         test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
 550 
 551         bitmap_fill(bits, 20);
 552         test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
 553         test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
 554 
 555         large_bitmap();
 556 }
 557 
 558 static void __init
 559 netdev_features(void)
 560 {
 561 }
 562 
 563 static void __init
 564 flags(void)
 565 {
 566         unsigned long flags;
 567         gfp_t gfp;
 568         char *cmp_buffer;
 569 
 570         flags = 0;
 571         test("", "%pGp", &flags);
 572 
 573         /* Page flags should filter the zone id */
 574         flags = 1UL << NR_PAGEFLAGS;
 575         test("", "%pGp", &flags);
 576 
 577         flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
 578                 | 1UL << PG_active | 1UL << PG_swapbacked;
 579         test("uptodate|dirty|lru|active|swapbacked", "%pGp", &flags);
 580 
 581 
 582         flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC
 583                         | VM_DENYWRITE;
 584         test("read|exec|mayread|maywrite|mayexec|denywrite", "%pGv", &flags);
 585 
 586         gfp = GFP_TRANSHUGE;
 587         test("GFP_TRANSHUGE", "%pGg", &gfp);
 588 
 589         gfp = GFP_ATOMIC|__GFP_DMA;
 590         test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
 591 
 592         gfp = __GFP_ATOMIC;
 593         test("__GFP_ATOMIC", "%pGg", &gfp);
 594 
 595         cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
 596         if (!cmp_buffer)
 597                 return;
 598 
 599         /* Any flags not translated by the table should remain numeric */
 600         gfp = ~__GFP_BITS_MASK;
 601         snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
 602         test(cmp_buffer, "%pGg", &gfp);
 603 
 604         snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
 605                                                         (unsigned long) gfp);
 606         gfp |= __GFP_ATOMIC;
 607         test(cmp_buffer, "%pGg", &gfp);
 608 
 609         kfree(cmp_buffer);
 610 }
 611 
 612 static void __init
 613 test_pointer(void)
 614 {
 615         plain();
 616         null_pointer();
 617         error_pointer();
 618         invalid_pointer();
 619         symbol_ptr();
 620         kernel_ptr();
 621         struct_resource();
 622         addr();
 623         escaped_str();
 624         hex_string();
 625         mac();
 626         ip();
 627         uuid();
 628         dentry();
 629         struct_va_format();
 630         struct_rtc_time();
 631         struct_clk();
 632         bitmap();
 633         netdev_features();
 634         flags();
 635 }
 636 
 637 static void __init selftest(void)
 638 {
 639         alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
 640         if (!alloced_buffer)
 641                 return;
 642         test_buffer = alloced_buffer + PAD_SIZE;
 643 
 644         test_basic();
 645         test_number();
 646         test_string();
 647         test_pointer();
 648 
 649         kfree(alloced_buffer);
 650 }
 651 
 652 KSTM_MODULE_LOADERS(test_printf);
 653 MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
 654 MODULE_LICENSE("GPL");
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root/lib/test_printf.c

DEFINITIONS
