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1/*
2 * Kernel Debugger Architecture Independent Console I/O handler
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
10 */
11
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/ctype.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/kdev_t.h>
18#include <linux/console.h>
19#include <linux/string.h>
20#include <linux/sched.h>
21#include <linux/smp.h>
22#include <linux/nmi.h>
23#include <linux/delay.h>
24#include <linux/kdb.h>
25#include <linux/kallsyms.h>
26#include "kdb_private.h"
27
28#define CMD_BUFLEN 256
29char kdb_prompt_str[CMD_BUFLEN];
30
31
32static void kgdb_transition_check(char *buffer)
33{
34 int slen = strlen(buffer);
35 if (strncmp(buffer, "$?#3f", slen) != 0 &&
36 strncmp(buffer, "$qSupported#37", slen) != 0 &&
37 strncmp(buffer, "+$qSupported#37", slen) != 0) {
38 KDB_STATE_SET(KGDB_TRANS);
39 kdb_printf("%s", buffer);
40 }
41}
42
43static int kdb_read_get_key(char *buffer, size_t bufsize)
44{
45#define ESCAPE_UDELAY 1000
46#define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */
47 char escape_data[5]; /* longest vt100 escape sequence is 4 bytes */
48 char *ped = escape_data;
49 int escape_delay = 0;
50 get_char_func *f, *f_escape = NULL;
51 int key;
52
53 for (f = &kdb_poll_funcs[0]; ; ++f) {
54 if (*f == NULL) {
55 /* Reset NMI watchdog once per poll loop */
56 touch_nmi_watchdog();
57 f = &kdb_poll_funcs[0];
58 }
59 if (escape_delay == 2) {
60 *ped = '\0';
61 ped = escape_data;
62 --escape_delay;
63 }
64 if (escape_delay == 1) {
65 key = *ped++;
66 if (!*ped)
67 --escape_delay;
68 break;
69 }
70 key = (*f)();
71 if (key == -1) {
72 if (escape_delay) {
73 udelay(ESCAPE_UDELAY);
74 --escape_delay;
75 }
76 continue;
77 }
78 if (bufsize <= 2) {
79 if (key == '\r')
80 key = '\n';
81 *buffer++ = key;
82 *buffer = '\0';
83 return -1;
84 }
85 if (escape_delay == 0 && key == '\e') {
86 escape_delay = ESCAPE_DELAY;
87 ped = escape_data;
88 f_escape = f;
89 }
90 if (escape_delay) {
91 *ped++ = key;
92 if (f_escape != f) {
93 escape_delay = 2;
94 continue;
95 }
96 if (ped - escape_data == 1) {
97 /* \e */
98 continue;
99 } else if (ped - escape_data == 2) {
100 /* \e<something> */
101 if (key != '[')
102 escape_delay = 2;
103 continue;
104 } else if (ped - escape_data == 3) {
105 /* \e[<something> */
106 int mapkey = 0;
107 switch (key) {
108 case 'A': /* \e[A, up arrow */
109 mapkey = 16;
110 break;
111 case 'B': /* \e[B, down arrow */
112 mapkey = 14;
113 break;
114 case 'C': /* \e[C, right arrow */
115 mapkey = 6;
116 break;
117 case 'D': /* \e[D, left arrow */
118 mapkey = 2;
119 break;
120 case '1': /* dropthrough */
121 case '3': /* dropthrough */
122 /* \e[<1,3,4>], may be home, del, end */
123 case '4':
124 mapkey = -1;
125 break;
126 }
127 if (mapkey != -1) {
128 if (mapkey > 0) {
129 escape_data[0] = mapkey;
130 escape_data[1] = '\0';
131 }
132 escape_delay = 2;
133 }
134 continue;
135 } else if (ped - escape_data == 4) {
136 /* \e[<1,3,4><something> */
137 int mapkey = 0;
138 if (key == '~') {
139 switch (escape_data[2]) {
140 case '1': /* \e[1~, home */
141 mapkey = 1;
142 break;
143 case '3': /* \e[3~, del */
144 mapkey = 4;
145 break;
146 case '4': /* \e[4~, end */
147 mapkey = 5;
148 break;
149 }
150 }
151 if (mapkey > 0) {
152 escape_data[0] = mapkey;
153 escape_data[1] = '\0';
154 }
155 escape_delay = 2;
156 continue;
157 }
158 }
159 break; /* A key to process */
160 }
161 return key;
162}
163
164/*
165 * kdb_read
166 *
167 * This function reads a string of characters, terminated by
168 * a newline, or by reaching the end of the supplied buffer,
169 * from the current kernel debugger console device.
170 * Parameters:
171 * buffer - Address of character buffer to receive input characters.
172 * bufsize - size, in bytes, of the character buffer
173 * Returns:
174 * Returns a pointer to the buffer containing the received
175 * character string. This string will be terminated by a
176 * newline character.
177 * Locking:
178 * No locks are required to be held upon entry to this
179 * function. It is not reentrant - it relies on the fact
180 * that while kdb is running on only one "master debug" cpu.
181 * Remarks:
182 *
183 * The buffer size must be >= 2. A buffer size of 2 means that the caller only
184 * wants a single key.
185 *
186 * An escape key could be the start of a vt100 control sequence such as \e[D
187 * (left arrow) or it could be a character in its own right. The standard
188 * method for detecting the difference is to wait for 2 seconds to see if there
189 * are any other characters. kdb is complicated by the lack of a timer service
190 * (interrupts are off), by multiple input sources and by the need to sometimes
191 * return after just one key. Escape sequence processing has to be done as
192 * states in the polling loop.
193 */
194
195static char *kdb_read(char *buffer, size_t bufsize)
196{
197 char *cp = buffer;
198 char *bufend = buffer+bufsize-2; /* Reserve space for newline
199 * and null byte */
200 char *lastchar;
201 char *p_tmp;
202 char tmp;
203 static char tmpbuffer[CMD_BUFLEN];
204 int len = strlen(buffer);
205 int len_tmp;
206 int tab = 0;
207 int count;
208 int i;
209 int diag, dtab_count;
210 int key;
211
212
213 diag = kdbgetintenv("DTABCOUNT", &dtab_count);
214 if (diag)
215 dtab_count = 30;
216
217 if (len > 0) {
218 cp += len;
219 if (*(buffer+len-1) == '\n')
220 cp--;
221 }
222
223 lastchar = cp;
224 *cp = '\0';
225 kdb_printf("%s", buffer);
226poll_again:
227 key = kdb_read_get_key(buffer, bufsize);
228 if (key == -1)
229 return buffer;
230 if (key != 9)
231 tab = 0;
232 switch (key) {
233 case 8: /* backspace */
234 if (cp > buffer) {
235 if (cp < lastchar) {
236 memcpy(tmpbuffer, cp, lastchar - cp);
237 memcpy(cp-1, tmpbuffer, lastchar - cp);
238 }
239 *(--lastchar) = '\0';
240 --cp;
241 kdb_printf("\b%s \r", cp);
242 tmp = *cp;
243 *cp = '\0';
244 kdb_printf(kdb_prompt_str);
245 kdb_printf("%s", buffer);
246 *cp = tmp;
247 }
248 break;
249 case 13: /* enter */
250 *lastchar++ = '\n';
251 *lastchar++ = '\0';
252 kdb_printf("\n");
253 return buffer;
254 case 4: /* Del */
255 if (cp < lastchar) {
256 memcpy(tmpbuffer, cp+1, lastchar - cp - 1);
257 memcpy(cp, tmpbuffer, lastchar - cp - 1);
258 *(--lastchar) = '\0';
259 kdb_printf("%s \r", cp);
260 tmp = *cp;
261 *cp = '\0';
262 kdb_printf(kdb_prompt_str);
263 kdb_printf("%s", buffer);
264 *cp = tmp;
265 }
266 break;
267 case 1: /* Home */
268 if (cp > buffer) {
269 kdb_printf("\r");
270 kdb_printf(kdb_prompt_str);
271 cp = buffer;
272 }
273 break;
274 case 5: /* End */
275 if (cp < lastchar) {
276 kdb_printf("%s", cp);
277 cp = lastchar;
278 }
279 break;
280 case 2: /* Left */
281 if (cp > buffer) {
282 kdb_printf("\b");
283 --cp;
284 }
285 break;
286 case 14: /* Down */
287 memset(tmpbuffer, ' ',
288 strlen(kdb_prompt_str) + (lastchar-buffer));
289 *(tmpbuffer+strlen(kdb_prompt_str) +
290 (lastchar-buffer)) = '\0';
291 kdb_printf("\r%s\r", tmpbuffer);
292 *lastchar = (char)key;
293 *(lastchar+1) = '\0';
294 return lastchar;
295 case 6: /* Right */
296 if (cp < lastchar) {
297 kdb_printf("%c", *cp);
298 ++cp;
299 }
300 break;
301 case 16: /* Up */
302 memset(tmpbuffer, ' ',
303 strlen(kdb_prompt_str) + (lastchar-buffer));
304 *(tmpbuffer+strlen(kdb_prompt_str) +
305 (lastchar-buffer)) = '\0';
306 kdb_printf("\r%s\r", tmpbuffer);
307 *lastchar = (char)key;
308 *(lastchar+1) = '\0';
309 return lastchar;
310 case 9: /* Tab */
311 if (tab < 2)
312 ++tab;
313 p_tmp = buffer;
314 while (*p_tmp == ' ')
315 p_tmp++;
316 if (p_tmp > cp)
317 break;
318 memcpy(tmpbuffer, p_tmp, cp-p_tmp);
319 *(tmpbuffer + (cp-p_tmp)) = '\0';
320 p_tmp = strrchr(tmpbuffer, ' ');
321 if (p_tmp)
322 ++p_tmp;
323 else
324 p_tmp = tmpbuffer;
325 len = strlen(p_tmp);
326 count = kallsyms_symbol_complete(p_tmp,
327 sizeof(tmpbuffer) -
328 (p_tmp - tmpbuffer));
329 if (tab == 2 && count > 0) {
330 kdb_printf("\n%d symbols are found.", count);
331 if (count > dtab_count) {
332 count = dtab_count;
333 kdb_printf(" But only first %d symbols will"
334 " be printed.\nYou can change the"
335 " environment variable DTABCOUNT.",
336 count);
337 }
338 kdb_printf("\n");
339 for (i = 0; i < count; i++) {
340 if (kallsyms_symbol_next(p_tmp, i) < 0)
341 break;
342 kdb_printf("%s ", p_tmp);
343 *(p_tmp + len) = '\0';
344 }
345 if (i >= dtab_count)
346 kdb_printf("...");
347 kdb_printf("\n");
348 kdb_printf(kdb_prompt_str);
349 kdb_printf("%s", buffer);
350 } else if (tab != 2 && count > 0) {
351 len_tmp = strlen(p_tmp);
352 strncpy(p_tmp+len_tmp, cp, lastchar-cp+1);
353 len_tmp = strlen(p_tmp);
354 strncpy(cp, p_tmp+len, len_tmp-len + 1);
355 len = len_tmp - len;
356 kdb_printf("%s", cp);
357 cp += len;
358 lastchar += len;
359 }
360 kdb_nextline = 1; /* reset output line number */
361 break;
362 default:
363 if (key >= 32 && lastchar < bufend) {
364 if (cp < lastchar) {
365 memcpy(tmpbuffer, cp, lastchar - cp);
366 memcpy(cp+1, tmpbuffer, lastchar - cp);
367 *++lastchar = '\0';
368 *cp = key;
369 kdb_printf("%s\r", cp);
370 ++cp;
371 tmp = *cp;
372 *cp = '\0';
373 kdb_printf(kdb_prompt_str);
374 kdb_printf("%s", buffer);
375 *cp = tmp;
376 } else {
377 *++lastchar = '\0';
378 *cp++ = key;
379 /* The kgdb transition check will hide
380 * printed characters if we think that
381 * kgdb is connecting, until the check
382 * fails */
383 if (!KDB_STATE(KGDB_TRANS))
384 kgdb_transition_check(buffer);
385 else
386 kdb_printf("%c", key);
387 }
388 /* Special escape to kgdb */
389 if (lastchar - buffer >= 5 &&
390 strcmp(lastchar - 5, "$?#3f") == 0) {
391 strcpy(buffer, "kgdb");
392 KDB_STATE_SET(DOING_KGDB);
393 return buffer;
394 }
395 if (lastchar - buffer >= 14 &&
396 strcmp(lastchar - 14, "$qSupported#37") == 0) {
397 strcpy(buffer, "kgdb");
398 KDB_STATE_SET(DOING_KGDB2);
399 return buffer;
400 }
401 }
402 break;
403 }
404 goto poll_again;
405}
406
407/*
408 * kdb_getstr
409 *
410 * Print the prompt string and read a command from the
411 * input device.
412 *
413 * Parameters:
414 * buffer Address of buffer to receive command
415 * bufsize Size of buffer in bytes
416 * prompt Pointer to string to use as prompt string
417 * Returns:
418 * Pointer to command buffer.
419 * Locking:
420 * None.
421 * Remarks:
422 * For SMP kernels, the processor number will be
423 * substituted for %d, %x or %o in the prompt.
424 */
425
426char *kdb_getstr(char *buffer, size_t bufsize, char *prompt)
427{
428 if (prompt && kdb_prompt_str != prompt)
429 strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
430 kdb_printf(kdb_prompt_str);
431 kdb_nextline = 1; /* Prompt and input resets line number */
432 return kdb_read(buffer, bufsize);
433}
434
435/*
436 * kdb_input_flush
437 *
438 * Get rid of any buffered console input.
439 *
440 * Parameters:
441 * none
442 * Returns:
443 * nothing
444 * Locking:
445 * none
446 * Remarks:
447 * Call this function whenever you want to flush input. If there is any
448 * outstanding input, it ignores all characters until there has been no
449 * data for approximately 1ms.
450 */
451
452static void kdb_input_flush(void)
453{
454 get_char_func *f;
455 int res;
456 int flush_delay = 1;
457 while (flush_delay) {
458 flush_delay--;
459empty:
460 touch_nmi_watchdog();
461 for (f = &kdb_poll_funcs[0]; *f; ++f) {
462 res = (*f)();
463 if (res != -1) {
464 flush_delay = 1;
465 goto empty;
466 }
467 }
468 if (flush_delay)
469 mdelay(1);
470 }
471}
472
473/*
474 * kdb_printf
475 *
476 * Print a string to the output device(s).
477 *
478 * Parameters:
479 * printf-like format and optional args.
480 * Returns:
481 * 0
482 * Locking:
483 * None.
484 * Remarks:
485 * use 'kdbcons->write()' to avoid polluting 'log_buf' with
486 * kdb output.
487 *
488 * If the user is doing a cmd args | grep srch
489 * then kdb_grepping_flag is set.
490 * In that case we need to accumulate full lines (ending in \n) before
491 * searching for the pattern.
492 */
493
494static char kdb_buffer[256]; /* A bit too big to go on stack */
495static char *next_avail = kdb_buffer;
496static int size_avail;
497static int suspend_grep;
498
499/*
500 * search arg1 to see if it contains arg2
501 * (kdmain.c provides flags for ^pat and pat$)
502 *
503 * return 1 for found, 0 for not found
504 */
505static int kdb_search_string(char *searched, char *searchfor)
506{
507 char firstchar, *cp;
508 int len1, len2;
509
510 /* not counting the newline at the end of "searched" */
511 len1 = strlen(searched)-1;
512 len2 = strlen(searchfor);
513 if (len1 < len2)
514 return 0;
515 if (kdb_grep_leading && kdb_grep_trailing && len1 != len2)
516 return 0;
517 if (kdb_grep_leading) {
518 if (!strncmp(searched, searchfor, len2))
519 return 1;
520 } else if (kdb_grep_trailing) {
521 if (!strncmp(searched+len1-len2, searchfor, len2))
522 return 1;
523 } else {
524 firstchar = *searchfor;
525 cp = searched;
526 while ((cp = strchr(cp, firstchar))) {
527 if (!strncmp(cp, searchfor, len2))
528 return 1;
529 cp++;
530 }
531 }
532 return 0;
533}
534
535int kdb_printf(const char *fmt, ...)
536{
537 va_list ap;
538 int diag;
539 int linecount;
540 int logging, saved_loglevel = 0;
541 int got_printf_lock = 0;
542 int retlen = 0;
543 int fnd, len;
544 char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
545 char *moreprompt = "more> ";
546 struct console *c = console_drivers;
547 static DEFINE_SPINLOCK(kdb_printf_lock);
548 unsigned long uninitialized_var(flags);
549
550 preempt_disable();
551 /* Serialize kdb_printf if multiple cpus try to write at once.
552 * But if any cpu goes recursive in kdb, just print the output,
553 * even if it is interleaved with any other text.
554 */
555 if (!KDB_STATE(PRINTF_LOCK)) {
556 KDB_STATE_SET(PRINTF_LOCK);
557 spin_lock_irqsave(&kdb_printf_lock, flags);
558 got_printf_lock = 1;
559 atomic_inc(&kdb_event);
560 } else {
561 __acquire(kdb_printf_lock);
562 }
563
564 diag = kdbgetintenv("LINES", &linecount);
565 if (diag || linecount <= 1)
566 linecount = 24;
567
568 diag = kdbgetintenv("LOGGING", &logging);
569 if (diag)
570 logging = 0;
571
572 if (!kdb_grepping_flag || suspend_grep) {
573 /* normally, every vsnprintf starts a new buffer */
574 next_avail = kdb_buffer;
575 size_avail = sizeof(kdb_buffer);
576 }
577 va_start(ap, fmt);
578 vsnprintf(next_avail, size_avail, fmt, ap);
579 va_end(ap);
580
581 /*
582 * If kdb_parse() found that the command was cmd xxx | grep yyy
583 * then kdb_grepping_flag is set, and kdb_grep_string contains yyy
584 *
585 * Accumulate the print data up to a newline before searching it.
586 * (vsnprintf does null-terminate the string that it generates)
587 */
588
589 /* skip the search if prints are temporarily unconditional */
590 if (!suspend_grep && kdb_grepping_flag) {
591 cp = strchr(kdb_buffer, '\n');
592 if (!cp) {
593 /*
594 * Special cases that don't end with newlines
595 * but should be written without one:
596 * The "[nn]kdb> " prompt should
597 * appear at the front of the buffer.
598 *
599 * The "[nn]more " prompt should also be
600 * (MOREPROMPT -> moreprompt)
601 * written * but we print that ourselves,
602 * we set the suspend_grep flag to make
603 * it unconditional.
604 *
605 */
606 if (next_avail == kdb_buffer) {
607 /*
608 * these should occur after a newline,
609 * so they will be at the front of the
610 * buffer
611 */
612 cp2 = kdb_buffer;
613 len = strlen(kdb_prompt_str);
614 if (!strncmp(cp2, kdb_prompt_str, len)) {
615 /*
616 * We're about to start a new
617 * command, so we can go back
618 * to normal mode.
619 */
620 kdb_grepping_flag = 0;
621 goto kdb_printit;
622 }
623 }
624 /* no newline; don't search/write the buffer
625 until one is there */
626 len = strlen(kdb_buffer);
627 next_avail = kdb_buffer + len;
628 size_avail = sizeof(kdb_buffer) - len;
629 goto kdb_print_out;
630 }
631
632 /*
633 * The newline is present; print through it or discard
634 * it, depending on the results of the search.
635 */
636 cp++; /* to byte after the newline */
637 replaced_byte = *cp; /* remember what/where it was */
638 cphold = cp;
639 *cp = '\0'; /* end the string for our search */
640
641 /*
642 * We now have a newline at the end of the string
643 * Only continue with this output if it contains the
644 * search string.
645 */
646 fnd = kdb_search_string(kdb_buffer, kdb_grep_string);
647 if (!fnd) {
648 /*
649 * At this point the complete line at the start
650 * of kdb_buffer can be discarded, as it does
651 * not contain what the user is looking for.
652 * Shift the buffer left.
653 */
654 *cphold = replaced_byte;
655 strcpy(kdb_buffer, cphold);
656 len = strlen(kdb_buffer);
657 next_avail = kdb_buffer + len;
658 size_avail = sizeof(kdb_buffer) - len;
659 goto kdb_print_out;
660 }
661 /*
662 * at this point the string is a full line and
663 * should be printed, up to the null.
664 */
665 }
666kdb_printit:
667
668 /*
669 * Write to all consoles.
670 */
671 retlen = strlen(kdb_buffer);
672 while (c) {
673 c->write(c, kdb_buffer, retlen);
674 touch_nmi_watchdog();
675 c = c->next;
676 }
677 if (logging) {
678 saved_loglevel = console_loglevel;
679 console_loglevel = 0;
680 printk(KERN_INFO "%s", kdb_buffer);
681 }
682
683 if (KDB_STATE(PAGER) && strchr(kdb_buffer, '\n'))
684 kdb_nextline++;
685
686 /* check for having reached the LINES number of printed lines */
687 if (kdb_nextline == linecount) {
688 char buf1[16] = "";
689#if defined(CONFIG_SMP)
690 char buf2[32];
691#endif
692
693 /* Watch out for recursion here. Any routine that calls
694 * kdb_printf will come back through here. And kdb_read
695 * uses kdb_printf to echo on serial consoles ...
696 */
697 kdb_nextline = 1; /* In case of recursion */
698
699 /*
700 * Pause until cr.
701 */
702 moreprompt = kdbgetenv("MOREPROMPT");
703 if (moreprompt == NULL)
704 moreprompt = "more> ";
705
706#if defined(CONFIG_SMP)
707 if (strchr(moreprompt, '%')) {
708 sprintf(buf2, moreprompt, get_cpu());
709 put_cpu();
710 moreprompt = buf2;
711 }
712#endif
713
714 kdb_input_flush();
715 c = console_drivers;
716
717 while (c) {
718 c->write(c, moreprompt, strlen(moreprompt));
719 touch_nmi_watchdog();
720 c = c->next;
721 }
722
723 if (logging)
724 printk("%s", moreprompt);
725
726 kdb_read(buf1, 2); /* '2' indicates to return
727 * immediately after getting one key. */
728 kdb_nextline = 1; /* Really set output line 1 */
729
730 /* empty and reset the buffer: */
731 kdb_buffer[0] = '\0';
732 next_avail = kdb_buffer;
733 size_avail = sizeof(kdb_buffer);
734 if ((buf1[0] == 'q') || (buf1[0] == 'Q')) {
735 /* user hit q or Q */
736 KDB_FLAG_SET(CMD_INTERRUPT); /* command interrupted */
737 KDB_STATE_CLEAR(PAGER);
738 /* end of command output; back to normal mode */
739 kdb_grepping_flag = 0;
740 kdb_printf("\n");
741 } else if (buf1[0] == ' ') {
742 kdb_printf("\n");
743 suspend_grep = 1; /* for this recursion */
744 } else if (buf1[0] == '\n') {
745 kdb_nextline = linecount - 1;
746 kdb_printf("\r");
747 suspend_grep = 1; /* for this recursion */
748 } else if (buf1[0] && buf1[0] != '\n') {
749 /* user hit something other than enter */
750 suspend_grep = 1; /* for this recursion */
751 kdb_printf("\nOnly 'q' or 'Q' are processed at more "
752 "prompt, input ignored\n");
753 } else if (kdb_grepping_flag) {
754 /* user hit enter */
755 suspend_grep = 1; /* for this recursion */
756 kdb_printf("\n");
757 }
758 kdb_input_flush();
759 }
760
761 /*
762 * For grep searches, shift the printed string left.
763 * replaced_byte contains the character that was overwritten with
764 * the terminating null, and cphold points to the null.
765 * Then adjust the notion of available space in the buffer.
766 */
767 if (kdb_grepping_flag && !suspend_grep) {
768 *cphold = replaced_byte;
769 strcpy(kdb_buffer, cphold);
770 len = strlen(kdb_buffer);
771 next_avail = kdb_buffer + len;
772 size_avail = sizeof(kdb_buffer) - len;
773 }
774
775kdb_print_out:
776 suspend_grep = 0; /* end of what may have been a recursive call */
777 if (logging)
778 console_loglevel = saved_loglevel;
779 if (KDB_STATE(PRINTF_LOCK) && got_printf_lock) {
780 got_printf_lock = 0;
781 spin_unlock_irqrestore(&kdb_printf_lock, flags);
782 KDB_STATE_CLEAR(PRINTF_LOCK);
783 atomic_dec(&kdb_event);
784 } else {
785 __release(kdb_printf_lock);
786 }
787 preempt_enable();
788 return retlen;
789}
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-14 21:50:25 -0500