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 = get_random_u32_inclusive(1, 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}
183
184static void __init
185test_string(void)
186{
187	test("", "%s%.0s", "", "123");
188	test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
189	test("1  |  2|3  |  4|5  ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
190	test("1234      ", "%-10.4s", "123456");
191	test("      1234", "%10.4s", "123456");
192	/*
193	 * POSIX and C99 say that a negative precision (which is only
194	 * possible to pass via a * argument) should be treated as if
195	 * the precision wasn't present, and that if the precision is
196	 * omitted (as in %.s), the precision should be taken to be
197	 * 0. However, the kernel's printf behave exactly opposite,
198	 * treating a negative precision as 0 and treating an omitted
199	 * precision specifier as if no precision was given.
200	 *
201	 * These test cases document the current behaviour; should
202	 * anyone ever feel the need to follow the standards more
203	 * closely, this can be revisited.
204	 */
205	test("    ", "%4.*s", -5, "123456");
206	test("123456", "%.s", "123456");
207	test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
208	test("a  |   |   ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
209}
210
211#define PLAIN_BUF_SIZE 64	/* leave some space so we don't oops */
212
213#if BITS_PER_LONG == 64
214
215#define PTR_WIDTH 16
216#define PTR ((void *)0xffff0123456789abUL)
217#define PTR_STR "ffff0123456789ab"
218#define PTR_VAL_NO_CRNG "(____ptrval____)"
219#define ZEROS "00000000"	/* hex 32 zero bits */
220#define ONES "ffffffff"		/* hex 32 one bits */
221
222static int __init
223plain_format(void)
224{
225	char buf[PLAIN_BUF_SIZE];
226	int nchars;
227
228	nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
229
230	if (nchars != PTR_WIDTH)
231		return -1;
232
233	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
234		pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
235			PTR_VAL_NO_CRNG);
236		return 0;
237	}
238
239	if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
240		return -1;
241
242	return 0;
243}
244
245#else
246
247#define PTR_WIDTH 8
248#define PTR ((void *)0x456789ab)
249#define PTR_STR "456789ab"
250#define PTR_VAL_NO_CRNG "(ptrval)"
251#define ZEROS ""
252#define ONES ""
253
254static int __init
255plain_format(void)
256{
257	/* Format is implicitly tested for 32 bit machines by plain_hash() */
258	return 0;
259}
260
261#endif	/* BITS_PER_LONG == 64 */
262
263static int __init
264plain_hash_to_buffer(const void *p, char *buf, size_t len)
265{
266	int nchars;
267
268	nchars = snprintf(buf, len, "%p", p);
269
270	if (nchars != PTR_WIDTH)
271		return -1;
272
273	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
274		pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
275			PTR_VAL_NO_CRNG);
276		return 0;
277	}
278
279	return 0;
280}
281
282static int __init
283plain_hash(void)
284{
285	char buf[PLAIN_BUF_SIZE];
286	int ret;
287
288	ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE);
289	if (ret)
290		return ret;
291
292	if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
293		return -1;
294
295	return 0;
296}
297
298/*
299 * We can't use test() to test %p because we don't know what output to expect
300 * after an address is hashed.
301 */
302static void __init
303plain(void)
304{
305	int err;
306
307	if (no_hash_pointers) {
308		pr_warn("skipping plain 'p' tests");
309		skipped_tests += 2;
310		return;
311	}
312
313	err = plain_hash();
314	if (err) {
315		pr_warn("plain 'p' does not appear to be hashed\n");
316		failed_tests++;
317		return;
318	}
319
320	err = plain_format();
321	if (err) {
322		pr_warn("hashing plain 'p' has unexpected format\n");
323		failed_tests++;
324	}
325}
326
327static void __init
328test_hashed(const char *fmt, const void *p)
329{
330	char buf[PLAIN_BUF_SIZE];
331	int ret;
332
333	/*
334	 * No need to increase failed test counter since this is assumed
335	 * to be called after plain().
336	 */
337	ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE);
338	if (ret)
339		return;
340
341	test(buf, fmt, p);
342}
343
344/*
345 * NULL pointers aren't hashed.
346 */
347static void __init
348null_pointer(void)
349{
350	test(ZEROS "00000000", "%p", NULL);
351	test(ZEROS "00000000", "%px", NULL);
352	test("(null)", "%pE", NULL);
353}
354
355/*
356 * Error pointers aren't hashed.
357 */
358static void __init
359error_pointer(void)
360{
361	test(ONES "fffffff5", "%p", ERR_PTR(-11));
362	test(ONES "fffffff5", "%px", ERR_PTR(-11));
363	test("(efault)", "%pE", ERR_PTR(-11));
364}
365
366#define PTR_INVALID ((void *)0x000000ab)
367
368static void __init
369invalid_pointer(void)
370{
371	test_hashed("%p", PTR_INVALID);
372	test(ZEROS "000000ab", "%px", PTR_INVALID);
373	test("(efault)", "%pE", PTR_INVALID);
374}
375
376static void __init
377symbol_ptr(void)
378{
379}
380
381static void __init
382kernel_ptr(void)
383{
384	/* We can't test this without access to kptr_restrict. */
385}
386
387static void __init
388struct_resource(void)
389{
390}
391
392static void __init
393addr(void)
394{
395}
396
397static void __init
398escaped_str(void)
399{
400}
401
402static void __init
403hex_string(void)
404{
405	const char buf[3] = {0xc0, 0xff, 0xee};
406
407	test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
408	     "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
409	test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
410	     "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
411}
412
413static void __init
414mac(void)
415{
416	const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
417
418	test("2d:48:d6:fc:7a:05", "%pM", addr);
419	test("05:7a:fc:d6:48:2d", "%pMR", addr);
420	test("2d-48-d6-fc-7a-05", "%pMF", addr);
421	test("2d48d6fc7a05", "%pm", addr);
422	test("057afcd6482d", "%pmR", addr);
423}
424
425static void __init
426ip4(void)
427{
428	struct sockaddr_in sa;
429
430	sa.sin_family = AF_INET;
431	sa.sin_port = cpu_to_be16(12345);
432	sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
433
434	test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
435	test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
436	sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
437	test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
438}
439
440static void __init
441ip6(void)
442{
443}
444
445static void __init
446ip(void)
447{
448	ip4();
449	ip6();
450}
451
452static void __init
453uuid(void)
454{
455	const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
456			       0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
457
458	test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
459	test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
460	test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
461	test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
462}
463
464static struct dentry test_dentry[4] __initdata = {
465	{ .d_parent = &test_dentry[0],
466	  .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
467	  .d_iname = "foo" },
468	{ .d_parent = &test_dentry[0],
469	  .d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
470	  .d_iname = "bravo" },
471	{ .d_parent = &test_dentry[1],
472	  .d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
473	  .d_iname = "alfa" },
474	{ .d_parent = &test_dentry[2],
475	  .d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
476	  .d_iname = "romeo" },
477};
478
479static void __init
480dentry(void)
481{
482	test("foo", "%pd", &test_dentry[0]);
483	test("foo", "%pd2", &test_dentry[0]);
484
485	test("(null)", "%pd", NULL);
486	test("(efault)", "%pd", PTR_INVALID);
487	test("(null)", "%pD", NULL);
488	test("(efault)", "%pD", PTR_INVALID);
489
490	test("romeo", "%pd", &test_dentry[3]);
491	test("alfa/romeo", "%pd2", &test_dentry[3]);
492	test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
493	test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
494	test("/bravo/alfa", "%pd4", &test_dentry[2]);
495
496	test("bravo/alfa  |bravo/alfa  ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
497	test("  bravo/alfa|  bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
498}
499
500static void __init
501struct_va_format(void)
502{
503}
504
505static void __init
506time_and_date(void)
507{
508	/* 1543210543 */
509	const struct rtc_time tm = {
510		.tm_sec = 43,
511		.tm_min = 35,
512		.tm_hour = 5,
513		.tm_mday = 26,
514		.tm_mon = 10,
515		.tm_year = 118,
516	};
517	/* 2019-01-04T15:32:23 */
518	time64_t t = 1546615943;
519
520	test("(%pt?)", "%pt", &tm);
521	test("2018-11-26T05:35:43", "%ptR", &tm);
522	test("0118-10-26T05:35:43", "%ptRr", &tm);
523	test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
524	test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
525	test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
526	test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);
527
528	test("2019-01-04T15:32:23", "%ptT", &t);
529	test("0119-00-04T15:32:23", "%ptTr", &t);
530	test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t);
531	test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t);
532
533	test("2019-01-04 15:32:23", "%ptTs", &t);
534	test("0119-00-04 15:32:23", "%ptTsr", &t);
535	test("15:32:23|2019-01-04", "%ptTts|%ptTds", &t, &t);
536	test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t);
537}
538
539static void __init
540struct_clk(void)
541{
542}
543
544static void __init
545large_bitmap(void)
546{
547	const int nbits = 1 << 16;
548	unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
549	if (!bits)
550		return;
551
552	bitmap_set(bits, 1, 20);
553	bitmap_set(bits, 60000, 15);
554	test("1-20,60000-60014", "%*pbl", nbits, bits);
555	bitmap_free(bits);
556}
557
558static void __init
559bitmap(void)
560{
561	DECLARE_BITMAP(bits, 20);
562	const int primes[] = {2,3,5,7,11,13,17,19};
563	int i;
564
565	bitmap_zero(bits, 20);
566	test("00000|00000", "%20pb|%*pb", bits, 20, bits);
567	test("|", "%20pbl|%*pbl", bits, 20, bits);
568
569	for (i = 0; i < ARRAY_SIZE(primes); ++i)
570		set_bit(primes[i], bits);
571	test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
572	test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
573
574	bitmap_fill(bits, 20);
575	test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
576	test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
577
578	large_bitmap();
579}
580
581static void __init
582netdev_features(void)
583{
584}
585
586struct page_flags_test {
587	int width;
588	int shift;
589	int mask;
590	const char *fmt;
591	const char *name;
592};
593
594static const struct page_flags_test pft[] = {
595	{SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
596	 "%d", "section"},
597	{NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
598	 "%d", "node"},
599	{ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
600	 "%d", "zone"},
601	{LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
602	 "%#x", "lastcpupid"},
603	{KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
604	 "%#x", "kasantag"},
605};
606
607static void __init
608page_flags_test(int section, int node, int zone, int last_cpupid,
609		int kasan_tag, unsigned long flags, const char *name,
610		char *cmp_buf)
611{
612	unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag};
613	unsigned long size;
614	bool append = false;
615	int i;
616
617	for (i = 0; i < ARRAY_SIZE(values); i++)
618		flags |= (values[i] & pft[i].mask) << pft[i].shift;
619
620	size = scnprintf(cmp_buf, BUF_SIZE, "%#lx(", flags);
621	if (flags & PAGEFLAGS_MASK) {
622		size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
623		append = true;
624	}
625
626	for (i = 0; i < ARRAY_SIZE(pft); i++) {
627		if (!pft[i].width)
628			continue;
629
630		if (append)
631			size += scnprintf(cmp_buf + size, BUF_SIZE - size, "|");
632
633		size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s=",
634				pft[i].name);
635		size += scnprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
636				values[i] & pft[i].mask);
637		append = true;
638	}
639
640	snprintf(cmp_buf + size, BUF_SIZE - size, ")");
641
642	test(cmp_buf, "%pGp", &flags);
643}
644
645static void __init
646flags(void)
647{
648	unsigned long flags;
649	char *cmp_buffer;
650	gfp_t gfp;
651
652	cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
653	if (!cmp_buffer)
654		return;
655
656	flags = 0;
657	page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
658
659	flags = 1UL << NR_PAGEFLAGS;
660	page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
661
662	flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
663		| 1UL << PG_active | 1UL << PG_swapbacked;
664	page_flags_test(1, 1, 1, 0x1fffff, 1, flags,
665			"uptodate|dirty|lru|active|swapbacked",
666			cmp_buffer);
667
668	flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
669	test("read|exec|mayread|maywrite|mayexec", "%pGv", &flags);
670
671	gfp = GFP_TRANSHUGE;
672	test("GFP_TRANSHUGE", "%pGg", &gfp);
673
674	gfp = GFP_ATOMIC|__GFP_DMA;
675	test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
676
677	gfp = __GFP_ATOMIC;
678	test("__GFP_ATOMIC", "%pGg", &gfp);
679
680	/* Any flags not translated by the table should remain numeric */
681	gfp = ~__GFP_BITS_MASK;
682	snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
683	test(cmp_buffer, "%pGg", &gfp);
684
685	snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
686							(unsigned long) gfp);
687	gfp |= __GFP_ATOMIC;
688	test(cmp_buffer, "%pGg", &gfp);
689
690	kfree(cmp_buffer);
691}
692
693static void __init fwnode_pointer(void)
694{
695	const struct software_node first = { .name = "first" };
696	const struct software_node second = { .name = "second", .parent = &first };
697	const struct software_node third = { .name = "third", .parent = &second };
698	const struct software_node *group[] = { &first, &second, &third, NULL };
699	const char * const full_name_second = "first/second";
700	const char * const full_name_third = "first/second/third";
701	const char * const second_name = "second";
702	const char * const third_name = "third";
703	int rval;
704
705	rval = software_node_register_node_group(group);
706	if (rval) {
707		pr_warn("cannot register softnodes; rval %d\n", rval);
708		return;
709	}
710
711	test(full_name_second, "%pfw", software_node_fwnode(&second));
712	test(full_name_third, "%pfw", software_node_fwnode(&third));
713	test(full_name_third, "%pfwf", software_node_fwnode(&third));
714	test(second_name, "%pfwP", software_node_fwnode(&second));
715	test(third_name, "%pfwP", software_node_fwnode(&third));
716
717	software_node_unregister_node_group(group);
718}
719
720static void __init fourcc_pointer(void)
721{
722	struct {
723		u32 code;
724		char *str;
725	} const try[] = {
726		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
727		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
728		{ 0x10111213, ".... little-endian (0x10111213)", },
729		{ 0x20303159, "Y10  little-endian (0x20303159)", },
730	};
731	unsigned int i;
732
733	for (i = 0; i < ARRAY_SIZE(try); i++)
734		test(try[i].str, "%p4cc", &try[i].code);
735}
736
737static void __init
738errptr(void)
739{
740	test("-1234", "%pe", ERR_PTR(-1234));
741
742	/* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
743	BUILD_BUG_ON(IS_ERR(PTR));
744	test_hashed("%pe", PTR);
745
746#ifdef CONFIG_SYMBOLIC_ERRNAME
747	test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
748	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
749	BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
750	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
751	test("[-EIO    ]", "[%-8pe]", ERR_PTR(-EIO));
752	test("[    -EIO]", "[%8pe]", ERR_PTR(-EIO));
753	test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
754#endif
755}
756
757static void __init
758test_pointer(void)
759{
760	plain();
761	null_pointer();
762	error_pointer();
763	invalid_pointer();
764	symbol_ptr();
765	kernel_ptr();
766	struct_resource();
767	addr();
768	escaped_str();
769	hex_string();
770	mac();
771	ip();
772	uuid();
773	dentry();
774	struct_va_format();
775	time_and_date();
776	struct_clk();
777	bitmap();
778	netdev_features();
779	flags();
780	errptr();
781	fwnode_pointer();
782	fourcc_pointer();
783}
784
785static void __init selftest(void)
786{
787	alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
788	if (!alloced_buffer)
789		return;
790	test_buffer = alloced_buffer + PAD_SIZE;
791
792	test_basic();
793	test_number();
794	test_string();
795	test_pointer();
796
797	kfree(alloced_buffer);
798}
799
800KSTM_MODULE_LOADERS(test_printf);
801MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
802MODULE_LICENSE("GPL");