summaryrefslogtreecommitdiff
path: root/lib/test_printf.c
blob: 55082432f37e144725bb578bc945107bd8d29e8c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Test cases for printf facility.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/random.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/string.h>

#include <linux/bitmap.h>
#include <linux/dcache.h>
#include <linux/socket.h>
#include <linux/in.h>

#include <linux/gfp.h>
#include <linux/mm.h>

#include <linux/property.h>

#include "../tools/testing/selftests/kselftest_module.h"

#define BUF_SIZE 256
#define PAD_SIZE 16
#define FILL_CHAR '$'

KSTM_MODULE_GLOBALS();

static char *test_buffer __initdata;
static char *alloced_buffer __initdata;

extern bool no_hash_pointers;

static int __printf(4, 0) __init
do_test(int bufsize, const char *expect, int elen,
	const char *fmt, va_list ap)
{
	va_list aq;
	int ret, written;

	total_tests++;

	memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
	va_copy(aq, ap);
	ret = vsnprintf(test_buffer, bufsize, fmt, aq);
	va_end(aq);

	if (ret != elen) {
		pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
			bufsize, fmt, ret, elen);
		return 1;
	}

	if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
		return 1;
	}

	if (!bufsize) {
		if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
			pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
				fmt);
			return 1;
		}
		return 0;
	}

	written = min(bufsize-1, elen);
	if (test_buffer[written]) {
		pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
			bufsize, fmt);
		return 1;
	}

	if (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
			bufsize, fmt);
		return 1;
	}

	if (memcmp(test_buffer, expect, written)) {
		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
			bufsize, fmt, test_buffer, written, expect);
		return 1;
	}
	return 0;
}

static void __printf(3, 4) __init
__test(const char *expect, int elen, const char *fmt, ...)
{
	va_list ap;
	int rand;
	char *p;

	if (elen >= BUF_SIZE) {
		pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
		       elen, fmt);
		failed_tests++;
		return;
	}

	va_start(ap, fmt);

	/*
	 * Every fmt+args is subjected to four tests: Three where we
	 * tell vsnprintf varying buffer sizes (plenty, not quite
	 * enough and 0), and then we also test that kvasprintf would
	 * be able to print it as expected.
	 */
	failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
	rand = 1 + prandom_u32_max(elen+1);
	/* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
	failed_tests += do_test(rand, expect, elen, fmt, ap);
	failed_tests += do_test(0, expect, elen, fmt, ap);

	p = kvasprintf(GFP_KERNEL, fmt, ap);
	if (p) {
		total_tests++;
		if (memcmp(p, expect, elen+1)) {
			pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
				fmt, p, expect);
			failed_tests++;
		}
		kfree(p);
	}
	va_end(ap);
}

#define test(expect, fmt, ...)					\
	__test(expect, strlen(expect), fmt, ##__VA_ARGS__)

static void __init
test_basic(void)
{
	/* Work around annoying "warning: zero-length gnu_printf format string". */
	char nul = '\0';

	test("", &nul);
	test("100%", "100%%");
	test("xxx%yyy", "xxx%cyyy", '%');
	__test("xxx\0yyy", 7, "xxx%cyyy", '\0');
}

static void __init
test_number(void)
{
	test("0x1234abcd  ", "%#-12x", 0x1234abcd);
	test("  0x1234abcd", "%#12x", 0x1234abcd);
	test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
	test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
	test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
	test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
	/*
	 * POSIX/C99: »The result of converting zero with an explicit
	 * precision of zero shall be no characters.« Hence the output
	 * from the below test should really be "00|0||| ". However,
	 * the kernel's printf also produces a single 0 in that
	 * case. This test case simply documents the current
	 * behaviour.
	 */
	test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
#ifndef __CHAR_UNSIGNED__
	{
		/*
		 * Passing a 'char' to a %02x specifier doesn't do
		 * what was presumably the intention when char is
		 * signed and the value is negative. One must either &
		 * with 0xff or cast to u8.
		 */
		char val = -16;
		test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val);
	}
#endif
}

static void __init
test_string(void)
{
	test("", "%s%.0s", "", "123");
	test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
	test("1  |  2|3  |  4|5  ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
	test("1234      ", "%-10.4s", "123456");
	test("      1234", "%10.4s", "123456");
	/*
	 * POSIX and C99 say that a negative precision (which is only
	 * possible to pass via a * argument) should be treated as if
	 * the precision wasn't present, and that if the precision is
	 * omitted (as in %.s), the precision should be taken to be
	 * 0. However, the kernel's printf behave exactly opposite,
	 * treating a negative precision as 0 and treating an omitted
	 * precision specifier as if no precision was given.
	 *
	 * These test cases document the current behaviour; should
	 * anyone ever feel the need to follow the standards more
	 * closely, this can be revisited.
	 */
	test("    ", "%4.*s", -5, "123456");
	test("123456", "%.s", "123456");
	test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
	test("a  |   |   ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
}

#define PLAIN_BUF_SIZE 64	/* leave some space so we don't oops */

#if BITS_PER_LONG == 64

#define PTR_WIDTH 16
#define PTR ((void *)0xffff0123456789abUL)
#define PTR_STR "ffff0123456789ab"
#define PTR_VAL_NO_CRNG "(____ptrval____)"
#define ZEROS "00000000"	/* hex 32 zero bits */
#define ONES "ffffffff"		/* hex 32 one bits */

static int __init
plain_format(void)
{
	char buf[PLAIN_BUF_SIZE];
	int nchars;

	nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);

	if (nchars != PTR_WIDTH)
		return -1;

	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
		pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
			PTR_VAL_NO_CRNG);
		return 0;
	}

	if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
		return -1;

	return 0;
}

#else

#define PTR_WIDTH 8
#define PTR ((void *)0x456789ab)
#define PTR_STR "456789ab"
#define PTR_VAL_NO_CRNG "(ptrval)"
#define ZEROS ""
#define ONES ""

static int __init
plain_format(void)
{
	/* Format is implicitly tested for 32 bit machines by plain_hash() */
	return 0;
}

#endif	/* BITS_PER_LONG == 64 */

static int __init
plain_hash_to_buffer(const void *p, char *buf, size_t len)
{
	int nchars;

	nchars = snprintf(buf, len, "%p", p);

	if (nchars != PTR_WIDTH)
		return -1;

	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
		pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
			PTR_VAL_NO_CRNG);
		return 0;
	}

	return 0;
}

static int __init
plain_hash(void)
{
	char buf[PLAIN_BUF_SIZE];
	int ret;

	ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE);
	if (ret)
		return ret;

	if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
		return -1;

	return 0;
}

/*
 * We can't use test() to test %p because we don't know what output to expect
 * after an address is hashed.
 */
static void __init
plain(void)
{
	int err;

	if (no_hash_pointers) {
		pr_warn("skipping plain 'p' tests");
		skipped_tests += 2;
		return;
	}

	err = plain_hash();
	if (err) {
		pr_warn("plain 'p' does not appear to be hashed\n");
		failed_tests++;
		return;
	}

	err = plain_format();
	if (err) {
		pr_warn("hashing plain 'p' has unexpected format\n");
		failed_tests++;
	}
}

static void __init
test_hashed(const char *fmt, const void *p)
{
	char buf[PLAIN_BUF_SIZE];
	int ret;

	/*
	 * No need to increase failed test counter since this is assumed
	 * to be called after plain().
	 */
	ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE);
	if (ret)
		return;

	test(buf, fmt, p);
}

/*
 * NULL pointers aren't hashed.
 */
static void __init
null_pointer(void)
{
	test(ZEROS "00000000", "%p", NULL);
	test(ZEROS "00000000", "%px", NULL);
	test("(null)", "%pE", NULL);
}

/*
 * Error pointers aren't hashed.
 */
static void __init
error_pointer(void)
{
	test(ONES "fffffff5", "%p", ERR_PTR(-11));
	test(ONES "fffffff5", "%px", ERR_PTR(-11));
	test("(efault)", "%pE", ERR_PTR(-11));
}

#define PTR_INVALID ((void *)0x000000ab)

static void __init
invalid_pointer(void)
{
	test_hashed("%p", PTR_INVALID);
	test(ZEROS "000000ab", "%px", PTR_INVALID);
	test("(efault)", "%pE", PTR_INVALID);
}

static void __init
symbol_ptr(void)
{
}

static void __init
kernel_ptr(void)
{
	/* We can't test this without access to kptr_restrict. */
}

static void __init
struct_resource(void)
{
}

static void __init
addr(void)
{
}

static void __init
escaped_str(void)
{
}

static void __init
hex_string(void)
{
	const char buf[3] = {0xc0, 0xff, 0xee};

	test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
	     "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
	test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
	     "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
}

static void __init
mac(void)
{
	const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};

	test("2d:48:d6:fc:7a:05", "%pM", addr);
	test("05:7a:fc:d6:48:2d", "%pMR", addr);
	test("2d-48-d6-fc-7a-05", "%pMF", addr);
	test("2d48d6fc7a05", "%pm", addr);
	test("057afcd6482d", "%pmR", addr);
}

static void __init
ip4(void)
{
	struct sockaddr_in sa;

	sa.sin_family = AF_INET;
	sa.sin_port = cpu_to_be16(12345);
	sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);

	test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
	test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
	sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
	test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
}

static void __init
ip6(void)
{
}

static void __init
ip(void)
{
	ip4();
	ip6();
}

static void __init
uuid(void)
{
	const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
			       0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};

	test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
	test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
	test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
	test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
}

static struct dentry test_dentry[4] __initdata = {
	{ .d_parent = &test_dentry[0],
	  .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
	  .d_iname = "foo" },
	{ .d_parent = &test_dentry[0],
	  .d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
	  .d_iname = "bravo" },
	{ .d_parent = &test_dentry[1],
	  .d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
	  .d_iname = "alfa" },
	{ .d_parent = &test_dentry[2],
	  .d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
	  .d_iname = "romeo" },
};

static void __init
dentry(void)
{
	test("foo", "%pd", &test_dentry[0]);
	test("foo", "%pd2", &test_dentry[0]);

	test("(null)", "%pd", NULL);
	test("(efault)", "%pd", PTR_INVALID);
	test("(null)", "%pD", NULL);
	test("(efault)", "%pD", PTR_INVALID);

	test("romeo", "%pd", &test_dentry[3]);
	test("alfa/romeo", "%pd2", &test_dentry[3]);
	test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
	test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
	test("/bravo/alfa", "%pd4", &test_dentry[2]);

	test("bravo/alfa  |bravo/alfa  ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
	test("  bravo/alfa|  bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
}

static void __init
struct_va_format(void)
{
}

static void __init
time_and_date(void)
{
	/* 1543210543 */
	const struct rtc_time tm = {
		.tm_sec = 43,
		.tm_min = 35,
		.tm_hour = 5,
		.tm_mday = 26,
		.tm_mon = 10,
		.tm_year = 118,
	};
	/* 2019-01-04T15:32:23 */
	time64_t t = 1546615943;

	test("(%pt?)", "%pt", &tm);
	test("2018-11-26T05:35:43", "%ptR", &tm);
	test("0118-10-26T05:35:43", "%ptRr", &tm);
	test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
	test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
	test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
	test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);

	test("2019-01-04T15:32:23", "%ptT", &t);
	test("0119-00-04T15:32:23", "%ptTr", &t);
	test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t);
	test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t);

	test("2019-01-04 15:32:23", "%ptTs", &t);
	test("0119-00-04 15:32:23", "%ptTsr", &t);
	test("15:32:23|2019-01-04", "%ptTts|%ptTds", &t, &t);
	test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t);
}

static void __init
struct_clk(void)
{
}

static void __init
large_bitmap(void)
{
	const int nbits = 1 << 16;
	unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
	if (!bits)
		return;

	bitmap_set(bits, 1, 20);
	bitmap_set(bits, 60000, 15);
	test("1-20,60000-60014", "%*pbl", nbits, bits);
	bitmap_free(bits);
}

static void __init
bitmap(void)
{
	DECLARE_BITMAP(bits, 20);
	const int primes[] = {2,3,5,7,11,13,17,19};
	int i;

	bitmap_zero(bits, 20);
	test("00000|00000", "%20pb|%*pb", bits, 20, bits);
	test("|", "%20pbl|%*pbl", bits, 20, bits);

	for (i = 0; i < ARRAY_SIZE(primes); ++i)
		set_bit(primes[i], bits);
	test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
	test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);

	bitmap_fill(bits, 20);
	test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
	test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);

	large_bitmap();
}

static void __init
netdev_features(void)
{
}

struct page_flags_test {
	int width;
	int shift;
	int mask;
	unsigned long value;
	const char *fmt;
	const char *name;
};

static struct page_flags_test pft[] = {
	{SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
	 0, "%d", "section"},
	{NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
	 0, "%d", "node"},
	{ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
	 0, "%d", "zone"},
	{LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
	 0, "%#x", "lastcpupid"},
	{KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
	 0, "%#x", "kasantag"},
};

static void __init
page_flags_test(int section, int node, int zone, int last_cpupid,
		int kasan_tag, int flags, const char *name, char *cmp_buf)
{
	unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag};
	unsigned long page_flags = 0;
	unsigned long size = 0;
	bool append = false;
	int i;

	flags &= PAGEFLAGS_MASK;
	if (flags) {
		page_flags |= flags;
		snprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
		size = strlen(cmp_buf);
#if SECTIONS_WIDTH || NODES_WIDTH || ZONES_WIDTH || \
	LAST_CPUPID_WIDTH || KASAN_TAG_WIDTH
		/* Other information also included in page flags */
		snprintf(cmp_buf + size, BUF_SIZE - size, "|");
		size = strlen(cmp_buf);
#endif
	}

	/* Set the test value */
	for (i = 0; i < ARRAY_SIZE(pft); i++)
		pft[i].value = values[i];

	for (i = 0; i < ARRAY_SIZE(pft); i++) {
		if (!pft[i].width)
			continue;

		if (append) {
			snprintf(cmp_buf + size, BUF_SIZE - size, "|");
			size = strlen(cmp_buf);
		}

		page_flags |= (pft[i].value & pft[i].mask) << pft[i].shift;
		snprintf(cmp_buf + size, BUF_SIZE - size, "%s=", pft[i].name);
		size = strlen(cmp_buf);
		snprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
			 pft[i].value & pft[i].mask);
		size = strlen(cmp_buf);
		append = true;
	}

	test(cmp_buf, "%pGp", &page_flags);
}

static void __init
flags(void)
{
	unsigned long flags;
	char *cmp_buffer;
	gfp_t gfp;

	cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
	if (!cmp_buffer)
		return;

	flags = 0;
	page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);

	flags = 1UL << NR_PAGEFLAGS;
	page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);

	flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
		| 1UL << PG_active | 1UL << PG_swapbacked;
	page_flags_test(1, 1, 1, 0x1fffff, 1, flags,
			"uptodate|dirty|lru|active|swapbacked",
			cmp_buffer);

	flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
	test("read|exec|mayread|maywrite|mayexec", "%pGv", &flags);

	gfp = GFP_TRANSHUGE;
	test("GFP_TRANSHUGE", "%pGg", &gfp);

	gfp = GFP_ATOMIC|__GFP_DMA;
	test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);

	gfp = __GFP_ATOMIC;
	test("__GFP_ATOMIC", "%pGg", &gfp);

	/* Any flags not translated by the table should remain numeric */
	gfp = ~__GFP_BITS_MASK;
	snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
	test(cmp_buffer, "%pGg", &gfp);

	snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
							(unsigned long) gfp);
	gfp |= __GFP_ATOMIC;
	test(cmp_buffer, "%pGg", &gfp);

	kfree(cmp_buffer);
}

static void __init fwnode_pointer(void)
{
	const struct software_node softnodes[] = {
		{ .name = "first", },
		{ .name = "second", .parent = &softnodes[0], },
		{ .name = "third", .parent = &softnodes[1], },
		{ NULL /* Guardian */ }
	};
	const char * const full_name = "first/second/third";
	const char * const full_name_second = "first/second";
	const char * const second_name = "second";
	const char * const third_name = "third";
	int rval;

	rval = software_node_register_nodes(softnodes);
	if (rval) {
		pr_warn("cannot register softnodes; rval %d\n", rval);
		return;
	}

	test(full_name_second, "%pfw", software_node_fwnode(&softnodes[1]));
	test(full_name, "%pfw", software_node_fwnode(&softnodes[2]));
	test(full_name, "%pfwf", software_node_fwnode(&softnodes[2]));
	test(second_name, "%pfwP", software_node_fwnode(&softnodes[1]));
	test(third_name, "%pfwP", software_node_fwnode(&softnodes[2]));

	software_node_unregister_nodes(softnodes);
}

static void __init fourcc_pointer(void)
{
	struct {
		u32 code;
		char *str;
	} const try[] = {
		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
		{ 0x10111213, ".... little-endian (0x10111213)", },
		{ 0x20303159, "Y10  little-endian (0x20303159)", },
	};
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(try); i++)
		test(try[i].str, "%p4cc", &try[i].code);
}

static void __init
errptr(void)
{
	test("-1234", "%pe", ERR_PTR(-1234));

	/* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
	BUILD_BUG_ON(IS_ERR(PTR));
	test_hashed("%pe", PTR);

#ifdef CONFIG_SYMBOLIC_ERRNAME
	test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
	BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
	test("[-EIO    ]", "[%-8pe]", ERR_PTR(-EIO));
	test("[    -EIO]", "[%8pe]", ERR_PTR(-EIO));
	test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
#endif
}

static void __init
test_pointer(void)
{
	plain();
	null_pointer();
	error_pointer();
	invalid_pointer();
	symbol_ptr();
	kernel_ptr();
	struct_resource();
	addr();
	escaped_str();
	hex_string();
	mac();
	ip();
	uuid();
	dentry();
	struct_va_format();
	time_and_date();
	struct_clk();
	bitmap();
	netdev_features();
	flags();
	errptr();
	fwnode_pointer();
	fourcc_pointer();
}

static void __init selftest(void)
{
	alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
	if (!alloced_buffer)
		return;
	test_buffer = alloced_buffer + PAD_SIZE;

	test_basic();
	test_number();
	test_string();
	test_pointer();

	kfree(alloced_buffer);
}

KSTM_MODULE_LOADERS(test_printf);
MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
MODULE_LICENSE("GPL");