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
 33KSTM_MODULE_GLOBALS();
 34
 35static char *test_buffer __initdata;
 36static char *alloced_buffer __initdata;
 37
 38extern bool no_hash_pointers;
 39
 40static int __printf(4, 0) __init
 41do_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
 95static 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
139static void __init
140test_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
151static void __init
152test_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
183static void __init
184test_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
221static int __init
222plain_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
253static int __init
254plain_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
262static int __init
263plain_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
281static int __init
282plain_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 */
301static void __init
302plain(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
326static void __init
327test_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 */
346static void __init
347null_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 */
357static void __init
358error_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
367static void __init
368invalid_pointer(void)
369{
370	test_hashed("%p", PTR_INVALID);
371	test(ZEROS "000000ab", "%px", PTR_INVALID);
372	test("(efault)", "%pE", PTR_INVALID);
373}
374
375static void __init
376symbol_ptr(void)
377{
378}
379
380static void __init
381kernel_ptr(void)
382{
383	/* We can't test this without access to kptr_restrict. */
384}
385
386static void __init
387struct_resource(void)
388{
389}
390
391static void __init
392addr(void)
393{
394}
395
396static void __init
397escaped_str(void)
398{
399}
400
401static void __init
402hex_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
412static void __init
413mac(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
424static void __init
425ip4(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
439static void __init
440ip6(void)
441{
442}
443
444static void __init
445ip(void)
446{
447	ip4();
448	ip6();
449}
450
451static void __init
452uuid(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
463static 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
478static void __init
479dentry(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
499static void __init
500struct_va_format(void)
501{
502}
503
504static void __init
505time_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	test("2019-01-04 15:32:23", "%ptTs", &t);
533	test("0119-00-04 15:32:23", "%ptTsr", &t);
534	test("15:32:23|2019-01-04", "%ptTts|%ptTds", &t, &t);
535	test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t);
536}
537
538static void __init
539struct_clk(void)
540{
541}
542
543static void __init
544large_bitmap(void)
545{
546	const int nbits = 1 << 16;
547	unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
548	if (!bits)
549		return;
550
551	bitmap_set(bits, 1, 20);
552	bitmap_set(bits, 60000, 15);
553	test("1-20,60000-60014", "%*pbl", nbits, bits);
554	bitmap_free(bits);
555}
556
557static void __init
558bitmap(void)
559{
560	DECLARE_BITMAP(bits, 20);
561	const int primes[] = {2,3,5,7,11,13,17,19};
562	int i;
563
564	bitmap_zero(bits, 20);
565	test("00000|00000", "%20pb|%*pb", bits, 20, bits);
566	test("|", "%20pbl|%*pbl", bits, 20, bits);
567
568	for (i = 0; i < ARRAY_SIZE(primes); ++i)
569		set_bit(primes[i], bits);
570	test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
571	test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
572
573	bitmap_fill(bits, 20);
574	test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
575	test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
576
577	large_bitmap();
578}
579
580static void __init
581netdev_features(void)
582{
583}
584
585struct page_flags_test {
586	int width;
587	int shift;
588	int mask;
589	unsigned long value;
590	const char *fmt;
591	const char *name;
592};
593
594static struct page_flags_test pft[] = {
595	{SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
596	 0, "%d", "section"},
597	{NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
598	 0, "%d", "node"},
599	{ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
600	 0, "%d", "zone"},
601	{LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
602	 0, "%#x", "lastcpupid"},
603	{KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
604	 0, "%#x", "kasantag"},
605};
606
607static void __init
608page_flags_test(int section, int node, int zone, int last_cpupid,
609		int kasan_tag, int flags, const char *name, char *cmp_buf)
610{
611	unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag};
612	unsigned long page_flags = 0;
613	unsigned long size = 0;
614	bool append = false;
615	int i;
616
617	flags &= BIT(NR_PAGEFLAGS) - 1;
618	if (flags) {
619		page_flags |= flags;
620		snprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
621		size = strlen(cmp_buf);
622#if SECTIONS_WIDTH || NODES_WIDTH || ZONES_WIDTH || \
623	LAST_CPUPID_WIDTH || KASAN_TAG_WIDTH
624		/* Other information also included in page flags */
625		snprintf(cmp_buf + size, BUF_SIZE - size, "|");
626		size = strlen(cmp_buf);
627#endif
628	}
629
630	/* Set the test value */
631	for (i = 0; i < ARRAY_SIZE(pft); i++)
632		pft[i].value = values[i];
633
634	for (i = 0; i < ARRAY_SIZE(pft); i++) {
635		if (!pft[i].width)
636			continue;
637
638		if (append) {
639			snprintf(cmp_buf + size, BUF_SIZE - size, "|");
640			size = strlen(cmp_buf);
641		}
642
643		page_flags |= (pft[i].value & pft[i].mask) << pft[i].shift;
644		snprintf(cmp_buf + size, BUF_SIZE - size, "%s=", pft[i].name);
645		size = strlen(cmp_buf);
646		snprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
647			 pft[i].value & pft[i].mask);
648		size = strlen(cmp_buf);
649		append = true;
650	}
651
652	test(cmp_buf, "%pGp", &page_flags);
653}
654
655static void __init
656flags(void)
657{
658	unsigned long flags;
659	char *cmp_buffer;
660	gfp_t gfp;
661
662	cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
663	if (!cmp_buffer)
664		return;
665
666	flags = 0;
667	page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
668
669	flags = 1UL << NR_PAGEFLAGS;
670	page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
671
672	flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
673		| 1UL << PG_active | 1UL << PG_swapbacked;
674	page_flags_test(1, 1, 1, 0x1fffff, 1, flags,
675			"uptodate|dirty|lru|active|swapbacked",
676			cmp_buffer);
677
678	flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC
679			| VM_DENYWRITE;
680	test("read|exec|mayread|maywrite|mayexec|denywrite", "%pGv", &flags);
681
682	gfp = GFP_TRANSHUGE;
683	test("GFP_TRANSHUGE", "%pGg", &gfp);
684
685	gfp = GFP_ATOMIC|__GFP_DMA;
686	test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
687
688	gfp = __GFP_ATOMIC;
689	test("__GFP_ATOMIC", "%pGg", &gfp);
690
691	/* Any flags not translated by the table should remain numeric */
692	gfp = ~__GFP_BITS_MASK;
693	snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
694	test(cmp_buffer, "%pGg", &gfp);
695
696	snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
697							(unsigned long) gfp);
698	gfp |= __GFP_ATOMIC;
699	test(cmp_buffer, "%pGg", &gfp);
700
701	kfree(cmp_buffer);
702}
703
704static void __init fwnode_pointer(void)
705{
706	const struct software_node softnodes[] = {
707		{ .name = "first", },
708		{ .name = "second", .parent = &softnodes[0], },
709		{ .name = "third", .parent = &softnodes[1], },
710		{ NULL /* Guardian */ }
711	};
712	const char * const full_name = "first/second/third";
713	const char * const full_name_second = "first/second";
714	const char * const second_name = "second";
715	const char * const third_name = "third";
716	int rval;
717
718	rval = software_node_register_nodes(softnodes);
719	if (rval) {
720		pr_warn("cannot register softnodes; rval %d\n", rval);
721		return;
722	}
723
724	test(full_name_second, "%pfw", software_node_fwnode(&softnodes[1]));
725	test(full_name, "%pfw", software_node_fwnode(&softnodes[2]));
726	test(full_name, "%pfwf", software_node_fwnode(&softnodes[2]));
727	test(second_name, "%pfwP", software_node_fwnode(&softnodes[1]));
728	test(third_name, "%pfwP", software_node_fwnode(&softnodes[2]));
729
730	software_node_unregister_nodes(softnodes);
731}
732
733static void __init fourcc_pointer(void)
734{
735	struct {
736		u32 code;
737		char *str;
738	} const try[] = {
739		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
740		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
741		{ 0x10111213, ".... little-endian (0x10111213)", },
742		{ 0x20303159, "Y10  little-endian (0x20303159)", },
743	};
744	unsigned int i;
745
746	for (i = 0; i < ARRAY_SIZE(try); i++)
747		test(try[i].str, "%p4cc", &try[i].code);
748}
749
750static void __init
751errptr(void)
752{
753	test("-1234", "%pe", ERR_PTR(-1234));
754
755	/* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
756	BUILD_BUG_ON(IS_ERR(PTR));
757	test_hashed("%pe", PTR);
758
759#ifdef CONFIG_SYMBOLIC_ERRNAME
760	test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
761	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
762	BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
763	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
764	test("[-EIO    ]", "[%-8pe]", ERR_PTR(-EIO));
765	test("[    -EIO]", "[%8pe]", ERR_PTR(-EIO));
766	test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
767#endif
768}
769
770static void __init
771test_pointer(void)
772{
773	plain();
774	null_pointer();
775	error_pointer();
776	invalid_pointer();
777	symbol_ptr();
778	kernel_ptr();
779	struct_resource();
780	addr();
781	escaped_str();
782	hex_string();
783	mac();
784	ip();
785	uuid();
786	dentry();
787	struct_va_format();
788	time_and_date();
789	struct_clk();
790	bitmap();
791	netdev_features();
792	flags();
793	errptr();
794	fwnode_pointer();
795	fourcc_pointer();
796}
797
798static void __init selftest(void)
799{
800	alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
801	if (!alloced_buffer)
802		return;
803	test_buffer = alloced_buffer + PAD_SIZE;
804
805	test_basic();
806	test_number();
807	test_string();
808	test_pointer();
809
810	kfree(alloced_buffer);
811}
812
813KSTM_MODULE_LOADERS(test_printf);
814MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
815MODULE_LICENSE("GPL");