projects/linux·blob v6.1-rc4 · refs

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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
39KSTM_MODULE_GLOBALS();
40
41static char *test_buffer __initdata;
42static char *alloced_buffer __initdata;
43
44extern bool no_hash_pointers;
45
46static int __printf(4, 0) __init
47do_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
106static 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
150static void __init
151test_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
162static void __init
163test_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
196static void __init
197test_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
234static int __init
235plain_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
266static int __init
267plain_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
275static int __init
276plain_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
294static int __init
295plain_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 */
314static void __init
315plain(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
339static void __init
340test_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 */
359static void __init
360null_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 */
370static void __init
371error_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
380static void __init
381invalid_pointer(void)
382{
383 test_hashed("%p", PTR_INVALID);
384 test(ZEROS "000000ab", "%px", PTR_INVALID);
385 test("(efault)", "%pE", PTR_INVALID);
386}
387
388static void __init
389symbol_ptr(void)
390{
391}
392
393static void __init
394kernel_ptr(void)
395{
396 /* We can't test this without access to kptr_restrict. */
397}
398
399static void __init
400struct_resource(void)
401{
402}
403
404static void __init
405addr(void)
406{
407}
408
409static void __init
410escaped_str(void)
411{
412}
413
414static void __init
415hex_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
425static void __init
426mac(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
437static void __init
438ip4(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
452static void __init
453ip6(void)
454{
455}
456
457static void __init
458ip(void)
459{
460 ip4();
461 ip6();
462}
463
464static void __init
465uuid(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
476static 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
491static void __init
492dentry(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
512static void __init
513struct_va_format(void)
514{
515}
516
517static void __init
518time_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
551static void __init
552struct_clk(void)
553{
554}
555
556static void __init
557large_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
570static void __init
571bitmap(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
593static void __init
594netdev_features(void)
595{
596}
597
598struct page_flags_test {
599 int width;
600 int shift;
601 int mask;
602 const char *fmt;
603 const char *name;
604};
605
606static 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
619static void __init
620page_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
657static void __init
658flags(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
705static 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
734static 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
751static void __init
752errptr(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
771static void __init
772test_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
799static 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
814KSTM_MODULE_LOADERS(test_printf);
815MODULE_AUTHOR("Rasmus Villemoes <[email protected]>");
816MODULE_LICENSE("GPL");