xref: /openbmc/linux/lib/test_printf.c (revision cd6d421e)
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 KSTM_MODULE_GLOBALS();
34 
35 static char *test_buffer __initdata;
36 static char *alloced_buffer __initdata;
37 
38 extern bool no_hash_pointers;
39 
40 static int __printf(4, 0) __init
41 do_test(int bufsize, const char *expect, int elen,
42 	const char *fmt, va_list ap)
43 {
44 	va_list aq;
45 	int ret, written;
46 
47 	total_tests++;
48 
49 	memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
50 	va_copy(aq, ap);
51 	ret = vsnprintf(test_buffer, bufsize, fmt, aq);
52 	va_end(aq);
53 
54 	if (ret != elen) {
55 		pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
56 			bufsize, fmt, ret, elen);
57 		return 1;
58 	}
59 
60 	if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
61 		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
62 		return 1;
63 	}
64 
65 	if (!bufsize) {
66 		if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
67 			pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
68 				fmt);
69 			return 1;
70 		}
71 		return 0;
72 	}
73 
74 	written = min(bufsize-1, elen);
75 	if (test_buffer[written]) {
76 		pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
77 			bufsize, fmt);
78 		return 1;
79 	}
80 
81 	if (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
82 		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
83 			bufsize, fmt);
84 		return 1;
85 	}
86 
87 	if (memcmp(test_buffer, expect, written)) {
88 		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
89 			bufsize, fmt, test_buffer, written, expect);
90 		return 1;
91 	}
92 	return 0;
93 }
94 
95 static void __printf(3, 4) __init
96 __test(const char *expect, int elen, const char *fmt, ...)
97 {
98 	va_list ap;
99 	int rand;
100 	char *p;
101 
102 	if (elen >= BUF_SIZE) {
103 		pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
104 		       elen, fmt);
105 		failed_tests++;
106 		return;
107 	}
108 
109 	va_start(ap, fmt);
110 
111 	/*
112 	 * Every fmt+args is subjected to four tests: Three where we
113 	 * tell vsnprintf varying buffer sizes (plenty, not quite
114 	 * enough and 0), and then we also test that kvasprintf would
115 	 * be able to print it as expected.
116 	 */
117 	failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
118 	rand = 1 + prandom_u32_max(elen+1);
119 	/* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
120 	failed_tests += do_test(rand, expect, elen, fmt, ap);
121 	failed_tests += do_test(0, expect, elen, fmt, ap);
122 
123 	p = kvasprintf(GFP_KERNEL, fmt, ap);
124 	if (p) {
125 		total_tests++;
126 		if (memcmp(p, expect, elen+1)) {
127 			pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
128 				fmt, p, expect);
129 			failed_tests++;
130 		}
131 		kfree(p);
132 	}
133 	va_end(ap);
134 }
135 
136 #define test(expect, fmt, ...)					\
137 	__test(expect, strlen(expect), fmt, ##__VA_ARGS__)
138 
139 static void __init
140 test_basic(void)
141 {
142 	/* Work around annoying "warning: zero-length gnu_printf format string". */
143 	char nul = '\0';
144 
145 	test("", &nul);
146 	test("100%", "100%%");
147 	test("xxx%yyy", "xxx%cyyy", '%');
148 	__test("xxx\0yyy", 7, "xxx%cyyy", '\0');
149 }
150 
151 static void __init
152 test_number(void)
153 {
154 	test("0x1234abcd  ", "%#-12x", 0x1234abcd);
155 	test("  0x1234abcd", "%#12x", 0x1234abcd);
156 	test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
157 	test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
158 	test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
159 	test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
160 	/*
161 	 * POSIX/C99: »The result of converting zero with an explicit
162 	 * precision of zero shall be no characters.« Hence the output
163 	 * from the below test should really be "00|0||| ". However,
164 	 * the kernel's printf also produces a single 0 in that
165 	 * case. This test case simply documents the current
166 	 * behaviour.
167 	 */
168 	test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
169 #ifndef __CHAR_UNSIGNED__
170 	{
171 		/*
172 		 * Passing a 'char' to a %02x specifier doesn't do
173 		 * what was presumably the intention when char is
174 		 * signed and the value is negative. One must either &
175 		 * with 0xff or cast to u8.
176 		 */
177 		char val = -16;
178 		test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val);
179 	}
180 #endif
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 
533 static void __init
534 struct_clk(void)
535 {
536 }
537 
538 static void __init
539 large_bitmap(void)
540 {
541 	const int nbits = 1 << 16;
542 	unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
543 	if (!bits)
544 		return;
545 
546 	bitmap_set(bits, 1, 20);
547 	bitmap_set(bits, 60000, 15);
548 	test("1-20,60000-60014", "%*pbl", nbits, bits);
549 	bitmap_free(bits);
550 }
551 
552 static void __init
553 bitmap(void)
554 {
555 	DECLARE_BITMAP(bits, 20);
556 	const int primes[] = {2,3,5,7,11,13,17,19};
557 	int i;
558 
559 	bitmap_zero(bits, 20);
560 	test("00000|00000", "%20pb|%*pb", bits, 20, bits);
561 	test("|", "%20pbl|%*pbl", bits, 20, bits);
562 
563 	for (i = 0; i < ARRAY_SIZE(primes); ++i)
564 		set_bit(primes[i], bits);
565 	test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
566 	test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
567 
568 	bitmap_fill(bits, 20);
569 	test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
570 	test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
571 
572 	large_bitmap();
573 }
574 
575 static void __init
576 netdev_features(void)
577 {
578 }
579 
580 static void __init
581 flags(void)
582 {
583 	unsigned long flags;
584 	gfp_t gfp;
585 	char *cmp_buffer;
586 
587 	flags = 0;
588 	test("", "%pGp", &flags);
589 
590 	/* Page flags should filter the zone id */
591 	flags = 1UL << NR_PAGEFLAGS;
592 	test("", "%pGp", &flags);
593 
594 	flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
595 		| 1UL << PG_active | 1UL << PG_swapbacked;
596 	test("uptodate|dirty|lru|active|swapbacked", "%pGp", &flags);
597 
598 
599 	flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC
600 			| VM_DENYWRITE;
601 	test("read|exec|mayread|maywrite|mayexec|denywrite", "%pGv", &flags);
602 
603 	gfp = GFP_TRANSHUGE;
604 	test("GFP_TRANSHUGE", "%pGg", &gfp);
605 
606 	gfp = GFP_ATOMIC|__GFP_DMA;
607 	test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
608 
609 	gfp = __GFP_ATOMIC;
610 	test("__GFP_ATOMIC", "%pGg", &gfp);
611 
612 	cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
613 	if (!cmp_buffer)
614 		return;
615 
616 	/* Any flags not translated by the table should remain numeric */
617 	gfp = ~__GFP_BITS_MASK;
618 	snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
619 	test(cmp_buffer, "%pGg", &gfp);
620 
621 	snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
622 							(unsigned long) gfp);
623 	gfp |= __GFP_ATOMIC;
624 	test(cmp_buffer, "%pGg", &gfp);
625 
626 	kfree(cmp_buffer);
627 }
628 
629 static void __init fwnode_pointer(void)
630 {
631 	const struct software_node softnodes[] = {
632 		{ .name = "first", },
633 		{ .name = "second", .parent = &softnodes[0], },
634 		{ .name = "third", .parent = &softnodes[1], },
635 		{ NULL /* Guardian */ }
636 	};
637 	const char * const full_name = "first/second/third";
638 	const char * const full_name_second = "first/second";
639 	const char * const second_name = "second";
640 	const char * const third_name = "third";
641 	int rval;
642 
643 	rval = software_node_register_nodes(softnodes);
644 	if (rval) {
645 		pr_warn("cannot register softnodes; rval %d\n", rval);
646 		return;
647 	}
648 
649 	test(full_name_second, "%pfw", software_node_fwnode(&softnodes[1]));
650 	test(full_name, "%pfw", software_node_fwnode(&softnodes[2]));
651 	test(full_name, "%pfwf", software_node_fwnode(&softnodes[2]));
652 	test(second_name, "%pfwP", software_node_fwnode(&softnodes[1]));
653 	test(third_name, "%pfwP", software_node_fwnode(&softnodes[2]));
654 
655 	software_node_unregister_nodes(softnodes);
656 }
657 
658 static void __init fourcc_pointer(void)
659 {
660 	struct {
661 		u32 code;
662 		char *str;
663 	} const try[] = {
664 		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
665 		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
666 		{ 0x10111213, ".... little-endian (0x10111213)", },
667 		{ 0x20303159, "Y10  little-endian (0x20303159)", },
668 	};
669 	unsigned int i;
670 
671 	for (i = 0; i < ARRAY_SIZE(try); i++)
672 		test(try[i].str, "%p4cc", &try[i].code);
673 }
674 
675 static void __init
676 errptr(void)
677 {
678 	test("-1234", "%pe", ERR_PTR(-1234));
679 
680 	/* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
681 	BUILD_BUG_ON(IS_ERR(PTR));
682 	test_hashed("%pe", PTR);
683 
684 #ifdef CONFIG_SYMBOLIC_ERRNAME
685 	test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
686 	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
687 	BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
688 	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
689 	test("[-EIO    ]", "[%-8pe]", ERR_PTR(-EIO));
690 	test("[    -EIO]", "[%8pe]", ERR_PTR(-EIO));
691 	test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
692 #endif
693 }
694 
695 static void __init
696 test_pointer(void)
697 {
698 	plain();
699 	null_pointer();
700 	error_pointer();
701 	invalid_pointer();
702 	symbol_ptr();
703 	kernel_ptr();
704 	struct_resource();
705 	addr();
706 	escaped_str();
707 	hex_string();
708 	mac();
709 	ip();
710 	uuid();
711 	dentry();
712 	struct_va_format();
713 	time_and_date();
714 	struct_clk();
715 	bitmap();
716 	netdev_features();
717 	flags();
718 	errptr();
719 	fwnode_pointer();
720 	fourcc_pointer();
721 }
722 
723 static void __init selftest(void)
724 {
725 	alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
726 	if (!alloced_buffer)
727 		return;
728 	test_buffer = alloced_buffer + PAD_SIZE;
729 
730 	test_basic();
731 	test_number();
732 	test_string();
733 	test_pointer();
734 
735 	kfree(alloced_buffer);
736 }
737 
738 KSTM_MODULE_LOADERS(test_printf);
739 MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
740 MODULE_LICENSE("GPL");
741