~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/tools/perf/tests/code-reading.c

Version: ~ [ linux-5.14-rc1 ] ~ [ linux-5.13.1 ] ~ [ linux-5.12.16 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.49 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.131 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.197 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.239 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.275 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.275 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <errno.h>
  3 #include <linux/kernel.h>
  4 #include <linux/types.h>
  5 #include <inttypes.h>
  6 #include <stdlib.h>
  7 #include <unistd.h>
  8 #include <stdio.h>
  9 #include <string.h>
 10 #include <sys/param.h>
 11 #include <perf/cpumap.h>
 12 #include <perf/evlist.h>
 13 #include <perf/mmap.h>
 14 
 15 #include "debug.h"
 16 #include "dso.h"
 17 #include "env.h"
 18 #include "parse-events.h"
 19 #include "trace-event.h"
 20 #include "evlist.h"
 21 #include "evsel.h"
 22 #include "thread_map.h"
 23 #include "machine.h"
 24 #include "map.h"
 25 #include "symbol.h"
 26 #include "event.h"
 27 #include "record.h"
 28 #include "util/mmap.h"
 29 #include "util/string2.h"
 30 #include "util/synthetic-events.h"
 31 #include "thread.h"
 32 
 33 #include "tests.h"
 34 
 35 #include <linux/ctype.h>
 36 
 37 #define BUFSZ   1024
 38 #define READLEN 128
 39 
 40 struct state {
 41         u64 done[1024];
 42         size_t done_cnt;
 43 };
 44 
 45 static size_t read_objdump_chunk(const char **line, unsigned char **buf,
 46                                  size_t *buf_len)
 47 {
 48         size_t bytes_read = 0;
 49         unsigned char *chunk_start = *buf;
 50 
 51         /* Read bytes */
 52         while (*buf_len > 0) {
 53                 char c1, c2;
 54 
 55                 /* Get 2 hex digits */
 56                 c1 = *(*line)++;
 57                 if (!isxdigit(c1))
 58                         break;
 59                 c2 = *(*line)++;
 60                 if (!isxdigit(c2))
 61                         break;
 62 
 63                 /* Store byte and advance buf */
 64                 **buf = (hex(c1) << 4) | hex(c2);
 65                 (*buf)++;
 66                 (*buf_len)--;
 67                 bytes_read++;
 68 
 69                 /* End of chunk? */
 70                 if (isspace(**line))
 71                         break;
 72         }
 73 
 74         /*
 75          * objdump will display raw insn as LE if code endian
 76          * is LE and bytes_per_chunk > 1. In that case reverse
 77          * the chunk we just read.
 78          *
 79          * see disassemble_bytes() at binutils/objdump.c for details
 80          * how objdump chooses display endian)
 81          */
 82         if (bytes_read > 1 && !bigendian()) {
 83                 unsigned char *chunk_end = chunk_start + bytes_read - 1;
 84                 unsigned char tmp;
 85 
 86                 while (chunk_start < chunk_end) {
 87                         tmp = *chunk_start;
 88                         *chunk_start = *chunk_end;
 89                         *chunk_end = tmp;
 90                         chunk_start++;
 91                         chunk_end--;
 92                 }
 93         }
 94 
 95         return bytes_read;
 96 }
 97 
 98 static size_t read_objdump_line(const char *line, unsigned char *buf,
 99                                 size_t buf_len)
100 {
101         const char *p;
102         size_t ret, bytes_read = 0;
103 
104         /* Skip to a colon */
105         p = strchr(line, ':');
106         if (!p)
107                 return 0;
108         p++;
109 
110         /* Skip initial spaces */
111         while (*p) {
112                 if (!isspace(*p))
113                         break;
114                 p++;
115         }
116 
117         do {
118                 ret = read_objdump_chunk(&p, &buf, &buf_len);
119                 bytes_read += ret;
120                 p++;
121         } while (ret > 0);
122 
123         /* return number of successfully read bytes */
124         return bytes_read;
125 }
126 
127 static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr)
128 {
129         char *line = NULL;
130         size_t line_len, off_last = 0;
131         ssize_t ret;
132         int err = 0;
133         u64 addr, last_addr = start_addr;
134 
135         while (off_last < *len) {
136                 size_t off, read_bytes, written_bytes;
137                 unsigned char tmp[BUFSZ];
138 
139                 ret = getline(&line, &line_len, f);
140                 if (feof(f))
141                         break;
142                 if (ret < 0) {
143                         pr_debug("getline failed\n");
144                         err = -1;
145                         break;
146                 }
147 
148                 /* read objdump data into temporary buffer */
149                 read_bytes = read_objdump_line(line, tmp, sizeof(tmp));
150                 if (!read_bytes)
151                         continue;
152 
153                 if (sscanf(line, "%"PRIx64, &addr) != 1)
154                         continue;
155                 if (addr < last_addr) {
156                         pr_debug("addr going backwards, read beyond section?\n");
157                         break;
158                 }
159                 last_addr = addr;
160 
161                 /* copy it from temporary buffer to 'buf' according
162                  * to address on current objdump line */
163                 off = addr - start_addr;
164                 if (off >= *len)
165                         break;
166                 written_bytes = MIN(read_bytes, *len - off);
167                 memcpy(buf + off, tmp, written_bytes);
168                 off_last = off + written_bytes;
169         }
170 
171         /* len returns number of bytes that could not be read */
172         *len -= off_last;
173 
174         free(line);
175 
176         return err;
177 }
178 
179 static int read_via_objdump(const char *filename, u64 addr, void *buf,
180                             size_t len)
181 {
182         char cmd[PATH_MAX * 2];
183         const char *fmt;
184         FILE *f;
185         int ret;
186 
187         fmt = "%s -z -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s";
188         ret = snprintf(cmd, sizeof(cmd), fmt, "objdump", addr, addr + len,
189                        filename);
190         if (ret <= 0 || (size_t)ret >= sizeof(cmd))
191                 return -1;
192 
193         pr_debug("Objdump command is: %s\n", cmd);
194 
195         /* Ignore objdump errors */
196         strcat(cmd, " 2>/dev/null");
197 
198         f = popen(cmd, "r");
199         if (!f) {
200                 pr_debug("popen failed\n");
201                 return -1;
202         }
203 
204         ret = read_objdump_output(f, buf, &len, addr);
205         if (len) {
206                 pr_debug("objdump read too few bytes: %zd\n", len);
207                 if (!ret)
208                         ret = len;
209         }
210 
211         pclose(f);
212 
213         return ret;
214 }
215 
216 static void dump_buf(unsigned char *buf, size_t len)
217 {
218         size_t i;
219 
220         for (i = 0; i < len; i++) {
221                 pr_debug("0x%02x ", buf[i]);
222                 if (i % 16 == 15)
223                         pr_debug("\n");
224         }
225         pr_debug("\n");
226 }
227 
228 static int read_object_code(u64 addr, size_t len, u8 cpumode,
229                             struct thread *thread, struct state *state)
230 {
231         struct addr_location al;
232         unsigned char buf1[BUFSZ];
233         unsigned char buf2[BUFSZ];
234         size_t ret_len;
235         u64 objdump_addr;
236         const char *objdump_name;
237         char decomp_name[KMOD_DECOMP_LEN];
238         bool decomp = false;
239         int ret;
240 
241         pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
242 
243         if (!thread__find_map(thread, cpumode, addr, &al) || !al.map->dso) {
244                 if (cpumode == PERF_RECORD_MISC_HYPERVISOR) {
245                         pr_debug("Hypervisor address can not be resolved - skipping\n");
246                         return 0;
247                 }
248 
249                 pr_debug("thread__find_map failed\n");
250                 return -1;
251         }
252 
253         pr_debug("File is: %s\n", al.map->dso->long_name);
254 
255         if (al.map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
256             !dso__is_kcore(al.map->dso)) {
257                 pr_debug("Unexpected kernel address - skipping\n");
258                 return 0;
259         }
260 
261         pr_debug("On file address is: %#"PRIx64"\n", al.addr);
262 
263         if (len > BUFSZ)
264                 len = BUFSZ;
265 
266         /* Do not go off the map */
267         if (addr + len > al.map->end)
268                 len = al.map->end - addr;
269 
270         /* Read the object code using perf */
271         ret_len = dso__data_read_offset(al.map->dso, thread->maps->machine,
272                                         al.addr, buf1, len);
273         if (ret_len != len) {
274                 pr_debug("dso__data_read_offset failed\n");
275                 return -1;
276         }
277 
278         /*
279          * Converting addresses for use by objdump requires more information.
280          * map__load() does that.  See map__rip_2objdump() for details.
281          */
282         if (map__load(al.map))
283                 return -1;
284 
285         /* objdump struggles with kcore - try each map only once */
286         if (dso__is_kcore(al.map->dso)) {
287                 size_t d;
288 
289                 for (d = 0; d < state->done_cnt; d++) {
290                         if (state->done[d] == al.map->start) {
291                                 pr_debug("kcore map tested already");
292                                 pr_debug(" - skipping\n");
293                                 return 0;
294                         }
295                 }
296                 if (state->done_cnt >= ARRAY_SIZE(state->done)) {
297                         pr_debug("Too many kcore maps - skipping\n");
298                         return 0;
299                 }
300                 state->done[state->done_cnt++] = al.map->start;
301         }
302 
303         objdump_name = al.map->dso->long_name;
304         if (dso__needs_decompress(al.map->dso)) {
305                 if (dso__decompress_kmodule_path(al.map->dso, objdump_name,
306                                                  decomp_name,
307                                                  sizeof(decomp_name)) < 0) {
308                         pr_debug("decompression failed\n");
309                         return -1;
310                 }
311 
312                 decomp = true;
313                 objdump_name = decomp_name;
314         }
315 
316         /* Read the object code using objdump */
317         objdump_addr = map__rip_2objdump(al.map, al.addr);
318         ret = read_via_objdump(objdump_name, objdump_addr, buf2, len);
319 
320         if (decomp)
321                 unlink(objdump_name);
322 
323         if (ret > 0) {
324                 /*
325                  * The kernel maps are inaccurate - assume objdump is right in
326                  * that case.
327                  */
328                 if (cpumode == PERF_RECORD_MISC_KERNEL ||
329                     cpumode == PERF_RECORD_MISC_GUEST_KERNEL) {
330                         len -= ret;
331                         if (len) {
332                                 pr_debug("Reducing len to %zu\n", len);
333                         } else if (dso__is_kcore(al.map->dso)) {
334                                 /*
335                                  * objdump cannot handle very large segments
336                                  * that may be found in kcore.
337                                  */
338                                 pr_debug("objdump failed for kcore");
339                                 pr_debug(" - skipping\n");
340                                 return 0;
341                         } else {
342                                 return -1;
343                         }
344                 }
345         }
346         if (ret < 0) {
347                 pr_debug("read_via_objdump failed\n");
348                 return -1;
349         }
350 
351         /* The results should be identical */
352         if (memcmp(buf1, buf2, len)) {
353                 pr_debug("Bytes read differ from those read by objdump\n");
354                 pr_debug("buf1 (dso):\n");
355                 dump_buf(buf1, len);
356                 pr_debug("buf2 (objdump):\n");
357                 dump_buf(buf2, len);
358                 return -1;
359         }
360         pr_debug("Bytes read match those read by objdump\n");
361 
362         return 0;
363 }
364 
365 static int process_sample_event(struct machine *machine,
366                                 struct evlist *evlist,
367                                 union perf_event *event, struct state *state)
368 {
369         struct perf_sample sample;
370         struct thread *thread;
371         int ret;
372 
373         if (evlist__parse_sample(evlist, event, &sample)) {
374                 pr_debug("evlist__parse_sample failed\n");
375                 return -1;
376         }
377 
378         thread = machine__findnew_thread(machine, sample.pid, sample.tid);
379         if (!thread) {
380                 pr_debug("machine__findnew_thread failed\n");
381                 return -1;
382         }
383 
384         ret = read_object_code(sample.ip, READLEN, sample.cpumode, thread, state);
385         thread__put(thread);
386         return ret;
387 }
388 
389 static int process_event(struct machine *machine, struct evlist *evlist,
390                          union perf_event *event, struct state *state)
391 {
392         if (event->header.type == PERF_RECORD_SAMPLE)
393                 return process_sample_event(machine, evlist, event, state);
394 
395         if (event->header.type == PERF_RECORD_THROTTLE ||
396             event->header.type == PERF_RECORD_UNTHROTTLE)
397                 return 0;
398 
399         if (event->header.type < PERF_RECORD_MAX) {
400                 int ret;
401 
402                 ret = machine__process_event(machine, event, NULL);
403                 if (ret < 0)
404                         pr_debug("machine__process_event failed, event type %u\n",
405                                  event->header.type);
406                 return ret;
407         }
408 
409         return 0;
410 }
411 
412 static int process_events(struct machine *machine, struct evlist *evlist,
413                           struct state *state)
414 {
415         union perf_event *event;
416         struct mmap *md;
417         int i, ret;
418 
419         for (i = 0; i < evlist->core.nr_mmaps; i++) {
420                 md = &evlist->mmap[i];
421                 if (perf_mmap__read_init(&md->core) < 0)
422                         continue;
423 
424                 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
425                         ret = process_event(machine, evlist, event, state);
426                         perf_mmap__consume(&md->core);
427                         if (ret < 0)
428                                 return ret;
429                 }
430                 perf_mmap__read_done(&md->core);
431         }
432         return 0;
433 }
434 
435 static int comp(const void *a, const void *b)
436 {
437         return *(int *)a - *(int *)b;
438 }
439 
440 static void do_sort_something(void)
441 {
442         int buf[40960], i;
443 
444         for (i = 0; i < (int)ARRAY_SIZE(buf); i++)
445                 buf[i] = ARRAY_SIZE(buf) - i - 1;
446 
447         qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp);
448 
449         for (i = 0; i < (int)ARRAY_SIZE(buf); i++) {
450                 if (buf[i] != i) {
451                         pr_debug("qsort failed\n");
452                         break;
453                 }
454         }
455 }
456 
457 static void sort_something(void)
458 {
459         int i;
460 
461         for (i = 0; i < 10; i++)
462                 do_sort_something();
463 }
464 
465 static void syscall_something(void)
466 {
467         int pipefd[2];
468         int i;
469 
470         for (i = 0; i < 1000; i++) {
471                 if (pipe(pipefd) < 0) {
472                         pr_debug("pipe failed\n");
473                         break;
474                 }
475                 close(pipefd[1]);
476                 close(pipefd[0]);
477         }
478 }
479 
480 static void fs_something(void)
481 {
482         const char *test_file_name = "temp-perf-code-reading-test-file--";
483         FILE *f;
484         int i;
485 
486         for (i = 0; i < 1000; i++) {
487                 f = fopen(test_file_name, "w+");
488                 if (f) {
489                         fclose(f);
490                         unlink(test_file_name);
491                 }
492         }
493 }
494 
495 #ifdef __s390x__
496 #include "header.h" // for get_cpuid()
497 #endif
498 
499 static const char *do_determine_event(bool excl_kernel)
500 {
501         const char *event = excl_kernel ? "cycles:u" : "cycles";
502 
503 #ifdef __s390x__
504         char cpuid[128], model[16], model_c[16], cpum_cf_v[16];
505         unsigned int family;
506         int ret, cpum_cf_a;
507 
508         if (get_cpuid(cpuid, sizeof(cpuid)))
509                 goto out_clocks;
510         ret = sscanf(cpuid, "%*[^,],%u,%[^,],%[^,],%[^,],%x", &family, model_c,
511                      model, cpum_cf_v, &cpum_cf_a);
512         if (ret != 5)            /* Not available */
513                 goto out_clocks;
514         if (excl_kernel && (cpum_cf_a & 4))
515                 return event;
516         if (!excl_kernel && (cpum_cf_a & 2))
517                 return event;
518 
519         /* Fall through: missing authorization */
520 out_clocks:
521         event = excl_kernel ? "cpu-clock:u" : "cpu-clock";
522 
523 #endif
524         return event;
525 }
526 
527 static void do_something(void)
528 {
529         fs_something();
530 
531         sort_something();
532 
533         syscall_something();
534 }
535 
536 enum {
537         TEST_CODE_READING_OK,
538         TEST_CODE_READING_NO_VMLINUX,
539         TEST_CODE_READING_NO_KCORE,
540         TEST_CODE_READING_NO_ACCESS,
541         TEST_CODE_READING_NO_KERNEL_OBJ,
542 };
543 
544 static int do_test_code_reading(bool try_kcore)
545 {
546         struct machine *machine;
547         struct thread *thread;
548         struct record_opts opts = {
549                 .mmap_pages          = UINT_MAX,
550                 .user_freq           = UINT_MAX,
551                 .user_interval       = ULLONG_MAX,
552                 .freq                = 500,
553                 .target              = {
554                         .uses_mmap   = true,
555                 },
556         };
557         struct state state = {
558                 .done_cnt = 0,
559         };
560         struct perf_thread_map *threads = NULL;
561         struct perf_cpu_map *cpus = NULL;
562         struct evlist *evlist = NULL;
563         struct evsel *evsel = NULL;
564         int err = -1, ret;
565         pid_t pid;
566         struct map *map;
567         bool have_vmlinux, have_kcore, excl_kernel = false;
568 
569         pid = getpid();
570 
571         machine = machine__new_host();
572         machine->env = &perf_env;
573 
574         ret = machine__create_kernel_maps(machine);
575         if (ret < 0) {
576                 pr_debug("machine__create_kernel_maps failed\n");
577                 goto out_err;
578         }
579 
580         /* Force the use of kallsyms instead of vmlinux to try kcore */
581         if (try_kcore)
582                 symbol_conf.kallsyms_name = "/proc/kallsyms";
583 
584         /* Load kernel map */
585         map = machine__kernel_map(machine);
586         ret = map__load(map);
587         if (ret < 0) {
588                 pr_debug("map__load failed\n");
589                 goto out_err;
590         }
591         have_vmlinux = dso__is_vmlinux(map->dso);
592         have_kcore = dso__is_kcore(map->dso);
593 
594         /* 2nd time through we just try kcore */
595         if (try_kcore && !have_kcore)
596                 return TEST_CODE_READING_NO_KCORE;
597 
598         /* No point getting kernel events if there is no kernel object */
599         if (!have_vmlinux && !have_kcore)
600                 excl_kernel = true;
601 
602         threads = thread_map__new_by_tid(pid);
603         if (!threads) {
604                 pr_debug("thread_map__new_by_tid failed\n");
605                 goto out_err;
606         }
607 
608         ret = perf_event__synthesize_thread_map(NULL, threads,
609                                                 perf_event__process, machine, false);
610         if (ret < 0) {
611                 pr_debug("perf_event__synthesize_thread_map failed\n");
612                 goto out_err;
613         }
614 
615         thread = machine__findnew_thread(machine, pid, pid);
616         if (!thread) {
617                 pr_debug("machine__findnew_thread failed\n");
618                 goto out_put;
619         }
620 
621         cpus = perf_cpu_map__new(NULL);
622         if (!cpus) {
623                 pr_debug("perf_cpu_map__new failed\n");
624                 goto out_put;
625         }
626 
627         while (1) {
628                 const char *str;
629 
630                 evlist = evlist__new();
631                 if (!evlist) {
632                         pr_debug("evlist__new failed\n");
633                         goto out_put;
634                 }
635 
636                 perf_evlist__set_maps(&evlist->core, cpus, threads);
637 
638                 str = do_determine_event(excl_kernel);
639                 pr_debug("Parsing event '%s'\n", str);
640                 ret = parse_events(evlist, str, NULL);
641                 if (ret < 0) {
642                         pr_debug("parse_events failed\n");
643                         goto out_put;
644                 }
645 
646                 evlist__config(evlist, &opts, NULL);
647 
648                 evsel = evlist__first(evlist);
649 
650                 evsel->core.attr.comm = 1;
651                 evsel->core.attr.disabled = 1;
652                 evsel->core.attr.enable_on_exec = 0;
653 
654                 ret = evlist__open(evlist);
655                 if (ret < 0) {
656                         if (!excl_kernel) {
657                                 excl_kernel = true;
658                                 /*
659                                  * Both cpus and threads are now owned by evlist
660                                  * and will be freed by following perf_evlist__set_maps
661                                  * call. Getting reference to keep them alive.
662                                  */
663                                 perf_cpu_map__get(cpus);
664                                 perf_thread_map__get(threads);
665                                 perf_evlist__set_maps(&evlist->core, NULL, NULL);
666                                 evlist__delete(evlist);
667                                 evlist = NULL;
668                                 continue;
669                         }
670 
671                         if (verbose > 0) {
672                                 char errbuf[512];
673                                 evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
674                                 pr_debug("perf_evlist__open() failed!\n%s\n", errbuf);
675                         }
676 
677                         goto out_put;
678                 }
679                 break;
680         }
681 
682         ret = evlist__mmap(evlist, UINT_MAX);
683         if (ret < 0) {
684                 pr_debug("evlist__mmap failed\n");
685                 goto out_put;
686         }
687 
688         evlist__enable(evlist);
689 
690         do_something();
691 
692         evlist__disable(evlist);
693 
694         ret = process_events(machine, evlist, &state);
695         if (ret < 0)
696                 goto out_put;
697 
698         if (!have_vmlinux && !have_kcore && !try_kcore)
699                 err = TEST_CODE_READING_NO_KERNEL_OBJ;
700         else if (!have_vmlinux && !try_kcore)
701                 err = TEST_CODE_READING_NO_VMLINUX;
702         else if (excl_kernel)
703                 err = TEST_CODE_READING_NO_ACCESS;
704         else
705                 err = TEST_CODE_READING_OK;
706 out_put:
707         thread__put(thread);
708 out_err:
709         evlist__delete(evlist);
710         perf_cpu_map__put(cpus);
711         perf_thread_map__put(threads);
712         machine__delete_threads(machine);
713         machine__delete(machine);
714 
715         return err;
716 }
717 
718 int test__code_reading(struct test *test __maybe_unused, int subtest __maybe_unused)
719 {
720         int ret;
721 
722         ret = do_test_code_reading(false);
723         if (!ret)
724                 ret = do_test_code_reading(true);
725 
726         switch (ret) {
727         case TEST_CODE_READING_OK:
728                 return 0;
729         case TEST_CODE_READING_NO_VMLINUX:
730                 pr_debug("no vmlinux\n");
731                 return 0;
732         case TEST_CODE_READING_NO_KCORE:
733                 pr_debug("no kcore\n");
734                 return 0;
735         case TEST_CODE_READING_NO_ACCESS:
736                 pr_debug("no access\n");
737                 return 0;
738         case TEST_CODE_READING_NO_KERNEL_OBJ:
739                 pr_debug("no kernel obj\n");
740                 return 0;
741         default:
742                 return -1;
743         };
744 }
745 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp