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/sprintf.h>
16 #include <linux/string.h>
17
18 #include <linux/bitmap.h>
19 #include <linux/dcache.h>
20 #include <linux/socket.h>
21 #include <linux/in.h>
22
23 #include <linux/gfp.h>
24 #include <linux/mm.h>
25
26 #include <linux/property.h>
27
28 #include "../tools/testing/selftests/kselftest_module.h"
29
30 #define BUF_SIZE 256
31 #define PAD_SIZE 16
32 #define FILL_CHAR '$'
33
34 #define NOWARN(option, comment, block) \
35 __diag_push(); \
36 __diag_ignore_all(#option, comment); \
37 block \
38 __diag_pop();
39
40 KSTM_MODULE_GLOBALS();
41
42 static char *test_buffer __initdata;
43 static char *alloced_buffer __initdata;
44
45 static int __printf(4, 0) __init
46 do_test(int bufsize, const char *expect, int elen,
47 const char *fmt, va_list ap)
48 {
49 va_list aq;
50 int ret, written;
51
52 total_tests++;
53
54 memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
55 va_copy(aq, ap);
56 ret = vsnprintf(test_buffer, bufsize, fmt, aq);
57 va_end(aq);
58
59 if (ret != elen) {
60 pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
61 bufsize, fmt, ret, elen);
62 return 1;
63 }
64
65 if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
66 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
67 return 1;
68 }
69
70 if (!bufsize) {
71 if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
72 pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
73 fmt);
74 return 1;
75 }
76 return 0;
77 }
78
79 written = min(bufsize-1, elen);
80 if (test_buffer[written]) {
81 pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
82 bufsize, fmt);
83 return 1;
84 }
85
86 if (memchr_inv(test_buffer + written + 1, FILL_CHAR, bufsize - (written + 1))) {
87 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
88 bufsize, fmt);
89 return 1;
90 }
91
92 if (memchr_inv(test_buffer + bufsize, FILL_CHAR, BUF_SIZE + PAD_SIZE - bufsize)) {
93 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond buffer\n", bufsize, fmt);
94 return 1;
95 }
96
97 if (memcmp(test_buffer, expect, written)) {
98 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
99 bufsize, fmt, test_buffer, written, expect);
100 return 1;
101 }
102 return 0;
103 }
104
105 static void __printf(3, 4) __init
106 __test(const char *expect, int elen, const char *fmt, ...)
107 {
108 va_list ap;
109 int rand;
110 char *p;
111
112 if (elen >= BUF_SIZE) {
113 pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
114 elen, fmt);
115 failed_tests++;
116 return;
117 }
118
119 va_start(ap, fmt);
120
121 /*
122 * Every fmt+args is subjected to four tests: Three where we
123 * tell vsnprintf varying buffer sizes (plenty, not quite
124 * enough and 0), and then we also test that kvasprintf would
125 * be able to print it as expected.
126 */
127 failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
128 rand = get_random_u32_inclusive(1, elen + 1);
129 /* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
130 failed_tests += do_test(rand, expect, elen, fmt, ap);
131 failed_tests += do_test(0, expect, elen, fmt, ap);
132
133 p = kvasprintf(GFP_KERNEL, fmt, ap);
134 if (p) {
135 total_tests++;
136 if (memcmp(p, expect, elen+1)) {
137 pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
138 fmt, p, expect);
139 failed_tests++;
140 }
141 kfree(p);
142 }
143 va_end(ap);
144 }
145
146 #define test(expect, fmt, ...) \
147 __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
148
149 static void __init
150 test_basic(void)
151 {
152 /* Work around annoying "warning: zero-length gnu_printf format string". */
153 char nul = '\0';
154
155 test("", &nul);
156 test("100%", "100%%");
157 test("xxx%yyy", "xxx%cyyy", '%');
158 __test("xxx\0yyy", 7, "xxx%cyyy", '\0');
159 }
160
161 static void __init
162 test_number(void)
163 {
164 test("0x1234abcd ", "%#-12x", 0x1234abcd);
165 test(" 0x1234abcd", "%#12x", 0x1234abcd);
166 test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
167 NOWARN(-Wformat, "Intentionally test narrowing conversion specifiers.", {
168 test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
169 test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
170 test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
171 })
172 /*
173 * POSIX/C99: »The result of converting zero with an explicit
174 * precision of zero shall be no characters.« Hence the output
175 * from the below test should really be "00|0||| ". However,
176 * the kernel's printf also produces a single 0 in that
177 * case. This test case simply documents the current
178 * behaviour.
179 */
180 test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
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 const char *fmt;
590 const char *name;
591 };
592
593 static const struct page_flags_test pft[] = {
594 {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
595 "%d", "section"},
596 {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
597 "%d", "node"},
598 {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
599 "%d", "zone"},
600 {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
601 "%#x", "lastcpupid"},
602 {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
603 "%#x", "kasantag"},
604 };
605
606 static void __init
607 page_flags_test(int section, int node, int zone, int last_cpupid,
608 int kasan_tag, unsigned long flags, const char *name,
609 char *cmp_buf)
610 {
611 unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag};
612 unsigned long size;
613 bool append = false;
614 int i;
615
616 for (i = 0; i < ARRAY_SIZE(values); i++)
617 flags |= (values[i] & pft[i].mask) << pft[i].shift;
618
619 size = scnprintf(cmp_buf, BUF_SIZE, "%#lx(", flags);
620 if (flags & PAGEFLAGS_MASK) {
621 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
622 append = true;
623 }
624
625 for (i = 0; i < ARRAY_SIZE(pft); i++) {
626 if (!pft[i].width)
627 continue;
628
629 if (append)
630 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "|");
631
632 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s=",
633 pft[i].name);
634 size += scnprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
635 values[i] & pft[i].mask);
636 append = true;
637 }
638
639 snprintf(cmp_buf + size, BUF_SIZE - size, ")");
640
641 test(cmp_buf, "%pGp", &flags);
642 }
643
644 static void __init page_type_test(unsigned int page_type, const char *name,
645 char *cmp_buf)
646 {
647 unsigned long size;
648
649 size = scnprintf(cmp_buf, BUF_SIZE, "%#x(", page_type);
650 if (page_type_has_type(page_type))
651 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
652
653 snprintf(cmp_buf + size, BUF_SIZE - size, ")");
654 test(cmp_buf, "%pGt", &page_type);
655 }
656
657 static void __init
658 flags(void)
659 {
660 unsigned long flags;
661 char *cmp_buffer;
662 gfp_t gfp;
663 unsigned int page_type;
664
665 cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
666 if (!cmp_buffer)
667 return;
668
669 flags = 0;
670 page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
671
672 flags = 1UL << NR_PAGEFLAGS;
673 page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
674
675 flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
676 | 1UL << PG_active | 1UL << PG_swapbacked;
677 page_flags_test(1, 1, 1, 0x1fffff, 1, flags,
678 "uptodate|dirty|lru|active|swapbacked",
679 cmp_buffer);
680
681 flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
682 test("read|exec|mayread|maywrite|mayexec", "%pGv", &flags);
683
684 gfp = GFP_TRANSHUGE;
685 test("GFP_TRANSHUGE", "%pGg", &gfp);
686
687 gfp = GFP_ATOMIC|__GFP_DMA;
688 test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
689
690 gfp = __GFP_HIGH;
691 test("__GFP_HIGH", "%pGg", &gfp);
692
693 /* Any flags not translated by the table should remain numeric */
694 gfp = ~__GFP_BITS_MASK;
695 snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
696 test(cmp_buffer, "%pGg", &gfp);
697
698 snprintf(cmp_buffer, BUF_SIZE, "__GFP_HIGH|%#lx",
699 (unsigned long) gfp);
700 gfp |= __GFP_HIGH;
701 test(cmp_buffer, "%pGg", &gfp);
702
703 page_type = ~0;
704 page_type_test(page_type, "", cmp_buffer);
705
706 page_type = 10;
707 page_type_test(page_type, "", cmp_buffer);
708
709 page_type = ~PG_buddy;
710 page_type_test(page_type, "buddy", cmp_buffer);
711
712 page_type = ~(PG_table | PG_buddy);
713 page_type_test(page_type, "table|buddy", cmp_buffer);
714
715 kfree(cmp_buffer);
716 }
717
718 static void __init fwnode_pointer(void)
719 {
720 const struct software_node first = { .name = "first" };
721 const struct software_node second = { .name = "second", .parent = &first };
722 const struct software_node third = { .name = "third", .parent = &second };
723 const struct software_node *group[] = { &first, &second, &third, NULL };
724 const char * const full_name_second = "first/second";
725 const char * const full_name_third = "first/second/third";
726 const char * const second_name = "second";
727 const char * const third_name = "third";
728 int rval;
729
730 rval = software_node_register_node_group(group);
731 if (rval) {
732 pr_warn("cannot register softnodes; rval %d\n", rval);
733 return;
734 }
735
736 test(full_name_second, "%pfw", software_node_fwnode(&second));
737 test(full_name_third, "%pfw", software_node_fwnode(&third));
738 test(full_name_third, "%pfwf", software_node_fwnode(&third));
739 test(second_name, "%pfwP", software_node_fwnode(&second));
740 test(third_name, "%pfwP", software_node_fwnode(&third));
741
742 software_node_unregister_node_group(group);
743 }
744
745 static void __init fourcc_pointer(void)
746 {
747 struct {
748 u32 code;
749 char *str;
750 } const try[] = {
751 { 0x3231564e, "NV12 little-endian (0x3231564e)", },
752 { 0xb231564e, "NV12 big-endian (0xb231564e)", },
753 { 0x10111213, ".... little-endian (0x10111213)", },
754 { 0x20303159, "Y10 little-endian (0x20303159)", },
755 };
756 unsigned int i;
757
758 for (i = 0; i < ARRAY_SIZE(try); i++)
759 test(try[i].str, "%p4cc", &try[i].code);
760 }
761
762 static void __init
763 errptr(void)
764 {
765 test("-1234", "%pe", ERR_PTR(-1234));
766
767 /* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
768 BUILD_BUG_ON(IS_ERR(PTR));
769 test_hashed("%pe", PTR);
770
771 #ifdef CONFIG_SYMBOLIC_ERRNAME
772 test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
773 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
774 BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
775 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
776 test("[-EIO ]", "[%-8pe]", ERR_PTR(-EIO));
777 test("[ -EIO]", "[%8pe]", ERR_PTR(-EIO));
778 test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
779 #endif
780 }
781
782 static void __init
783 test_pointer(void)
784 {
785 plain();
786 null_pointer();
787 error_pointer();
788 invalid_pointer();
789 symbol_ptr();
790 kernel_ptr();
791 struct_resource();
792 addr();
793 escaped_str();
794 hex_string();
795 mac();
796 ip();
797 uuid();
798 dentry();
799 struct_va_format();
800 time_and_date();
801 struct_clk();
802 bitmap();
803 netdev_features();
804 flags();
805 errptr();
806 fwnode_pointer();
807 fourcc_pointer();
808 }
809
810 static void __init selftest(void)
811 {
812 alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
813 if (!alloced_buffer)
814 return;
815 test_buffer = alloced_buffer + PAD_SIZE;
816
817 test_basic();
818 test_number();
819 test_string();
820 test_pointer();
821
822 kfree(alloced_buffer);
823 }
824
825 KSTM_MODULE_LOADERS(test_printf);
826 MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
827 MODULE_DESCRIPTION("Test cases for printf facility");
828 MODULE_LICENSE("GPL");
829
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