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
 33static unsigned total_tests __initdata;
 34static unsigned failed_tests __initdata;
 35static char *test_buffer __initdata;
 36static char *alloced_buffer __initdata;
 37
 38static int __printf(4, 0) __init
 39do_test(int bufsize, const char *expect, int elen,
 40	const char *fmt, va_list ap)
 41{
 42	va_list aq;
 43	int ret, written;
 44
 45	total_tests++;
 46
 47	memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
 48	va_copy(aq, ap);
 49	ret = vsnprintf(test_buffer, bufsize, fmt, aq);
 50	va_end(aq);
 51
 52	if (ret != elen) {
 53		pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
 54			bufsize, fmt, ret, elen);
 55		return 1;
 56	}
 57
 58	if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
 59		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
 60		return 1;
 61	}
 62
 63	if (!bufsize) {
 64		if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
 65			pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
 66				fmt);
 67			return 1;
 68		}
 69		return 0;
 70	}
 71
 72	written = min(bufsize-1, elen);
 73	if (test_buffer[written]) {
 74		pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
 75			bufsize, fmt);
 76		return 1;
 77	}
 78
 79	if (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
 80		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
 81			bufsize, fmt);
 82		return 1;
 83	}
 84
 85	if (memcmp(test_buffer, expect, written)) {
 86		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
 87			bufsize, fmt, test_buffer, written, expect);
 88		return 1;
 89	}
 90	return 0;
 91}
 92
 93static void __printf(3, 4) __init
 94__test(const char *expect, int elen, const char *fmt, ...)
 95{
 96	va_list ap;
 97	int rand;
 98	char *p;
 99
100	if (elen >= BUF_SIZE) {
101		pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
102		       elen, fmt);
103		failed_tests++;
104		return;
105	}
106
107	va_start(ap, fmt);
108
109	/*
110	 * Every fmt+args is subjected to four tests: Three where we
111	 * tell vsnprintf varying buffer sizes (plenty, not quite
112	 * enough and 0), and then we also test that kvasprintf would
113	 * be able to print it as expected.
114	 */
115	failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
116	rand = 1 + prandom_u32_max(elen+1);
117	/* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
118	failed_tests += do_test(rand, expect, elen, fmt, ap);
119	failed_tests += do_test(0, expect, elen, fmt, ap);
120
121	p = kvasprintf(GFP_KERNEL, fmt, ap);
122	if (p) {
123		total_tests++;
124		if (memcmp(p, expect, elen+1)) {
125			pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
126				fmt, p, expect);
127			failed_tests++;
128		}
129		kfree(p);
130	}
131	va_end(ap);
132}
133
134#define test(expect, fmt, ...)					\
135	__test(expect, strlen(expect), fmt, ##__VA_ARGS__)
136
137static void __init
138test_basic(void)
139{
140	/* Work around annoying "warning: zero-length gnu_printf format string". */
141	char nul = '\0';
142
143	test("", &nul);
144	test("100%", "100%%");
145	test("xxx%yyy", "xxx%cyyy", '%');
146	__test("xxx\0yyy", 7, "xxx%cyyy", '\0');
147}
148
149static void __init
150test_number(void)
151{
152	test("0x1234abcd  ", "%#-12x", 0x1234abcd);
153	test("  0x1234abcd", "%#12x", 0x1234abcd);
154	test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
155	test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
156	test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
157	test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
158	/*
159	 * POSIX/C99: »The result of converting zero with an explicit
160	 * precision of zero shall be no characters.« Hence the output
161	 * from the below test should really be "00|0||| ". However,
162	 * the kernel's printf also produces a single 0 in that
163	 * case. This test case simply documents the current
164	 * behaviour.
165	 */
166	test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
167#ifndef __CHAR_UNSIGNED__
168	{
169		/*
170		 * Passing a 'char' to a %02x specifier doesn't do
171		 * what was presumably the intention when char is
172		 * signed and the value is negative. One must either &
173		 * with 0xff or cast to u8.
174		 */
175		char val = -16;
176		test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val);
177	}
178#endif
179}
180
181static void __init
182test_string(void)
183{
184	test("", "%s%.0s", "", "123");
185	test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
186	test("1  |  2|3  |  4|5  ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
187	test("1234      ", "%-10.4s", "123456");
188	test("      1234", "%10.4s", "123456");
189	/*
190	 * POSIX and C99 say that a negative precision (which is only
191	 * possible to pass via a * argument) should be treated as if
192	 * the precision wasn't present, and that if the precision is
193	 * omitted (as in %.s), the precision should be taken to be
194	 * 0. However, the kernel's printf behave exactly opposite,
195	 * treating a negative precision as 0 and treating an omitted
196	 * precision specifier as if no precision was given.
197	 *
198	 * These test cases document the current behaviour; should
199	 * anyone ever feel the need to follow the standards more
200	 * closely, this can be revisited.
201	 */
202	test("    ", "%4.*s", -5, "123456");
203	test("123456", "%.s", "123456");
204	test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
205	test("a  |   |   ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
206}
207
208#define PLAIN_BUF_SIZE 64	/* leave some space so we don't oops */
209
210#if BITS_PER_LONG == 64
211
212#define PTR_WIDTH 16
213#define PTR ((void *)0xffff0123456789abUL)
214#define PTR_STR "ffff0123456789ab"
215#define PTR_VAL_NO_CRNG "(____ptrval____)"
216#define ZEROS "00000000"	/* hex 32 zero bits */
217#define ONES "ffffffff"		/* hex 32 one bits */
218
219static int __init
220plain_format(void)
221{
222	char buf[PLAIN_BUF_SIZE];
223	int nchars;
224
225	nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
226
227	if (nchars != PTR_WIDTH)
228		return -1;
229
230	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
231		pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
232			PTR_VAL_NO_CRNG);
233		return 0;
234	}
235
236	if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
237		return -1;
238
239	return 0;
240}
241
242#else
243
244#define PTR_WIDTH 8
245#define PTR ((void *)0x456789ab)
246#define PTR_STR "456789ab"
247#define PTR_VAL_NO_CRNG "(ptrval)"
248#define ZEROS ""
249#define ONES ""
250
251static int __init
252plain_format(void)
253{
254	/* Format is implicitly tested for 32 bit machines by plain_hash() */
255	return 0;
256}
257
258#endif	/* BITS_PER_LONG == 64 */
259
260static int __init
261plain_hash_to_buffer(const void *p, char *buf, size_t len)
262{
263	int nchars;
264
265	nchars = snprintf(buf, len, "%p", p);
266
267	if (nchars != PTR_WIDTH)
268		return -1;
269
270	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
271		pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
272			PTR_VAL_NO_CRNG);
273		return 0;
274	}
275
276	return 0;
277}
278
279static int __init
280plain_hash(void)
281{
282	char buf[PLAIN_BUF_SIZE];
283	int ret;
284
285	ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE);
286	if (ret)
287		return ret;
288
289	if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
290		return -1;
291
292	return 0;
293}
294
295/*
296 * We can't use test() to test %p because we don't know what output to expect
297 * after an address is hashed.
298 */
299static void __init
300plain(void)
301{
302	int err;
303
304	err = plain_hash();
305	if (err) {
306		pr_warn("plain 'p' does not appear to be hashed\n");
307		failed_tests++;
308		return;
309	}
310
311	err = plain_format();
312	if (err) {
313		pr_warn("hashing plain 'p' has unexpected format\n");
314		failed_tests++;
315	}
316}
317
318static void __init
319test_hashed(const char *fmt, const void *p)
320{
321	char buf[PLAIN_BUF_SIZE];
322	int ret;
323
324	/*
325	 * No need to increase failed test counter since this is assumed
326	 * to be called after plain().
327	 */
328	ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE);
329	if (ret)
330		return;
331
332	test(buf, fmt, p);
333}
334
335/*
336 * NULL pointers aren't hashed.
337 */
338static void __init
339null_pointer(void)
340{
341	test(ZEROS "00000000", "%p", NULL);
342	test(ZEROS "00000000", "%px", NULL);
343	test("(null)", "%pE", NULL);
344}
345
346/*
347 * Error pointers aren't hashed.
348 */
349static void __init
350error_pointer(void)
351{
352	test(ONES "fffffff5", "%p", ERR_PTR(-11));
353	test(ONES "fffffff5", "%px", ERR_PTR(-11));
354	test("(efault)", "%pE", ERR_PTR(-11));
355}
356
357#define PTR_INVALID ((void *)0x000000ab)
358
359static void __init
360invalid_pointer(void)
361{
362	test_hashed("%p", PTR_INVALID);
363	test(ZEROS "000000ab", "%px", PTR_INVALID);
364	test("(efault)", "%pE", PTR_INVALID);
365}
366
367static void __init
368symbol_ptr(void)
369{
370}
371
372static void __init
373kernel_ptr(void)
374{
375	/* We can't test this without access to kptr_restrict. */
376}
377
378static void __init
379struct_resource(void)
380{
381}
382
383static void __init
384addr(void)
385{
386}
387
388static void __init
389escaped_str(void)
390{
391}
392
393static void __init
394hex_string(void)
395{
396	const char buf[3] = {0xc0, 0xff, 0xee};
397
398	test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
399	     "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
400	test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
401	     "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
402}
403
404static void __init
405mac(void)
406{
407	const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
408
409	test("2d:48:d6:fc:7a:05", "%pM", addr);
410	test("05:7a:fc:d6:48:2d", "%pMR", addr);
411	test("2d-48-d6-fc-7a-05", "%pMF", addr);
412	test("2d48d6fc7a05", "%pm", addr);
413	test("057afcd6482d", "%pmR", addr);
414}
415
416static void __init
417ip4(void)
418{
419	struct sockaddr_in sa;
420
421	sa.sin_family = AF_INET;
422	sa.sin_port = cpu_to_be16(12345);
423	sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
424
425	test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
426	test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
427	sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
428	test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
429}
430
431static void __init
432ip6(void)
433{
434}
435
436static void __init
437ip(void)
438{
439	ip4();
440	ip6();
441}
442
443static void __init
444uuid(void)
445{
446	const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
447			       0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
448
449	test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
450	test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
451	test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
452	test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
453}
454
455static struct dentry test_dentry[4] __initdata = {
456	{ .d_parent = &test_dentry[0],
457	  .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
458	  .d_iname = "foo" },
459	{ .d_parent = &test_dentry[0],
460	  .d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
461	  .d_iname = "bravo" },
462	{ .d_parent = &test_dentry[1],
463	  .d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
464	  .d_iname = "alfa" },
465	{ .d_parent = &test_dentry[2],
466	  .d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
467	  .d_iname = "romeo" },
468};
469
470static void __init
471dentry(void)
472{
473	test("foo", "%pd", &test_dentry[0]);
474	test("foo", "%pd2", &test_dentry[0]);
475
476	test("(null)", "%pd", NULL);
477	test("(efault)", "%pd", PTR_INVALID);
478	test("(null)", "%pD", NULL);
479	test("(efault)", "%pD", PTR_INVALID);
480
481	test("romeo", "%pd", &test_dentry[3]);
482	test("alfa/romeo", "%pd2", &test_dentry[3]);
483	test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
484	test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
485	test("/bravo/alfa", "%pd4", &test_dentry[2]);
486
487	test("bravo/alfa  |bravo/alfa  ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
488	test("  bravo/alfa|  bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
489}
490
491static void __init
492struct_va_format(void)
493{
494}
495
496static void __init
497time_and_date(void)
498{
499	/* 1543210543 */
500	const struct rtc_time tm = {
501		.tm_sec = 43,
502		.tm_min = 35,
503		.tm_hour = 5,
504		.tm_mday = 26,
505		.tm_mon = 10,
506		.tm_year = 118,
507	};
508	/* 2019-01-04T15:32:23 */
509	time64_t t = 1546615943;
510
511	test("(%pt?)", "%pt", &tm);
512	test("2018-11-26T05:35:43", "%ptR", &tm);
513	test("0118-10-26T05:35:43", "%ptRr", &tm);
514	test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
515	test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
516	test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
517	test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);
518
519	test("2019-01-04T15:32:23", "%ptT", &t);
520	test("0119-00-04T15:32:23", "%ptTr", &t);
521	test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t);
522	test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t);
523}
524
525static void __init
526struct_clk(void)
527{
528}
529
530static void __init
531large_bitmap(void)
532{
533	const int nbits = 1 << 16;
534	unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
535	if (!bits)
536		return;
537
538	bitmap_set(bits, 1, 20);
539	bitmap_set(bits, 60000, 15);
540	test("1-20,60000-60014", "%*pbl", nbits, bits);
541	bitmap_free(bits);
542}
543
544static void __init
545bitmap(void)
546{
547	DECLARE_BITMAP(bits, 20);
548	const int primes[] = {2,3,5,7,11,13,17,19};
549	int i;
550
551	bitmap_zero(bits, 20);
552	test("00000|00000", "%20pb|%*pb", bits, 20, bits);
553	test("|", "%20pbl|%*pbl", bits, 20, bits);
554
555	for (i = 0; i < ARRAY_SIZE(primes); ++i)
556		set_bit(primes[i], bits);
557	test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
558	test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
559
560	bitmap_fill(bits, 20);
561	test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
562	test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
563
564	large_bitmap();
565}
566
567static void __init
568netdev_features(void)
569{
570}
571
572static void __init
573flags(void)
574{
575	unsigned long flags;
576	gfp_t gfp;
577	char *cmp_buffer;
578
579	flags = 0;
580	test("", "%pGp", &flags);
581
582	/* Page flags should filter the zone id */
583	flags = 1UL << NR_PAGEFLAGS;
584	test("", "%pGp", &flags);
585
586	flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
587		| 1UL << PG_active | 1UL << PG_swapbacked;
588	test("uptodate|dirty|lru|active|swapbacked", "%pGp", &flags);
589
590
591	flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC
592			| VM_DENYWRITE;
593	test("read|exec|mayread|maywrite|mayexec|denywrite", "%pGv", &flags);
594
595	gfp = GFP_TRANSHUGE;
596	test("GFP_TRANSHUGE", "%pGg", &gfp);
597
598	gfp = GFP_ATOMIC|__GFP_DMA;
599	test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
600
601	gfp = __GFP_ATOMIC;
602	test("__GFP_ATOMIC", "%pGg", &gfp);
603
604	cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
605	if (!cmp_buffer)
606		return;
607
608	/* Any flags not translated by the table should remain numeric */
609	gfp = ~__GFP_BITS_MASK;
610	snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
611	test(cmp_buffer, "%pGg", &gfp);
612
613	snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
614							(unsigned long) gfp);
615	gfp |= __GFP_ATOMIC;
616	test(cmp_buffer, "%pGg", &gfp);
617
618	kfree(cmp_buffer);
619}
620
621static void __init fwnode_pointer(void)
622{
623	const struct software_node softnodes[] = {
624		{ .name = "first", },
625		{ .name = "second", .parent = &softnodes[0], },
626		{ .name = "third", .parent = &softnodes[1], },
627		{ NULL /* Guardian */ }
628	};
629	const char * const full_name = "first/second/third";
630	const char * const full_name_second = "first/second";
631	const char * const second_name = "second";
632	const char * const third_name = "third";
633	int rval;
634
635	rval = software_node_register_nodes(softnodes);
636	if (rval) {
637		pr_warn("cannot register softnodes; rval %d\n", rval);
638		return;
639	}
640
641	test(full_name_second, "%pfw", software_node_fwnode(&softnodes[1]));
642	test(full_name, "%pfw", software_node_fwnode(&softnodes[2]));
643	test(full_name, "%pfwf", software_node_fwnode(&softnodes[2]));
644	test(second_name, "%pfwP", software_node_fwnode(&softnodes[1]));
645	test(third_name, "%pfwP", software_node_fwnode(&softnodes[2]));
646
647	software_node_unregister(&softnodes[2]);
648	software_node_unregister(&softnodes[1]);
649	software_node_unregister(&softnodes[0]);
650}
651
652static void __init
653errptr(void)
654{
655	test("-1234", "%pe", ERR_PTR(-1234));
656
657	/* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
658	BUILD_BUG_ON(IS_ERR(PTR));
659	test_hashed("%pe", PTR);
660
661#ifdef CONFIG_SYMBOLIC_ERRNAME
662	test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
663	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
664	BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
665	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
666	test("[-EIO    ]", "[%-8pe]", ERR_PTR(-EIO));
667	test("[    -EIO]", "[%8pe]", ERR_PTR(-EIO));
668	test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
669#endif
670}
671
672static void __init
673test_pointer(void)
674{
675	plain();
676	null_pointer();
677	error_pointer();
678	invalid_pointer();
679	symbol_ptr();
680	kernel_ptr();
681	struct_resource();
682	addr();
683	escaped_str();
684	hex_string();
685	mac();
686	ip();
687	uuid();
688	dentry();
689	struct_va_format();
690	time_and_date();
691	struct_clk();
692	bitmap();
693	netdev_features();
694	flags();
695	errptr();
696	fwnode_pointer();
697}
698
699static void __init selftest(void)
700{
701	alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
702	if (!alloced_buffer)
703		return;
704	test_buffer = alloced_buffer + PAD_SIZE;
705
706	test_basic();
707	test_number();
708	test_string();
709	test_pointer();
710
711	kfree(alloced_buffer);
712}
713
714KSTM_MODULE_LOADERS(test_printf);
715MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
716MODULE_LICENSE("GPL");