4 * make pr_debug()/dev_dbg() calls runtime configurable based upon their
7 * Copyright (C) 2008 Jason Baron <jbaron@redhat.com>
8 * By Greg Banks <gnb@melbourne.sgi.com>
9 * Copyright (c) 2008 Silicon Graphics Inc. All Rights Reserved.
10 * Copyright (C) 2011 Bart Van Assche. All Rights Reserved.
11 * Copyright (C) 2013 Du, Changbin <changbin.du@gmail.com>
14 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/kallsyms.h>
20 #include <linux/types.h>
21 #include <linux/mutex.h>
22 #include <linux/proc_fs.h>
23 #include <linux/seq_file.h>
24 #include <linux/list.h>
25 #include <linux/sysctl.h>
26 #include <linux/ctype.h>
27 #include <linux/string.h>
28 #include <linux/parser.h>
29 #include <linux/string_helpers.h>
30 #include <linux/uaccess.h>
31 #include <linux/dynamic_debug.h>
32 #include <linux/debugfs.h>
33 #include <linux/slab.h>
34 #include <linux/jump_label.h>
35 #include <linux/hardirq.h>
36 #include <linux/sched.h>
37 #include <linux/device.h>
38 #include <linux/netdevice.h>
40 extern struct _ddebug __start___verbose[];
41 extern struct _ddebug __stop___verbose[];
44 struct list_head link;
46 unsigned int num_ddebugs;
47 struct _ddebug *ddebugs;
55 unsigned int first_lineno, last_lineno;
59 struct ddebug_table *table;
63 static DEFINE_MUTEX(ddebug_lock);
64 static LIST_HEAD(ddebug_tables);
66 module_param(verbose, int, 0644);
68 /* Return the path relative to source root */
69 static inline const char *trim_prefix(const char *path)
71 int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c");
73 if (strncmp(path, __FILE__, skip))
74 skip = 0; /* prefix mismatch, don't skip */
79 static struct { unsigned flag:8; char opt_char; } opt_array[] = {
80 { _DPRINTK_FLAGS_PRINT, 'p' },
81 { _DPRINTK_FLAGS_INCL_MODNAME, 'm' },
82 { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' },
83 { _DPRINTK_FLAGS_INCL_LINENO, 'l' },
84 { _DPRINTK_FLAGS_INCL_TID, 't' },
85 { _DPRINTK_FLAGS_NONE, '_' },
88 struct flagsbuf { char buf[ARRAY_SIZE(opt_array)+1]; };
90 /* format a string into buf[] which describes the _ddebug's flags */
91 static char *ddebug_describe_flags(unsigned int flags, struct flagsbuf *fb)
96 for (i = 0; i < ARRAY_SIZE(opt_array); ++i)
97 if (flags & opt_array[i].flag)
98 *p++ = opt_array[i].opt_char;
106 #define vpr_info(fmt, ...) \
109 pr_info(fmt, ##__VA_ARGS__); \
112 static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
114 /* trim any trailing newlines */
118 fmtlen = strlen(query->format);
119 while (fmtlen && query->format[fmtlen - 1] == '\n')
123 vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n",
125 query->function ? query->function : "",
126 query->filename ? query->filename : "",
127 query->module ? query->module : "",
128 fmtlen, query->format ? query->format : "",
129 query->first_lineno, query->last_lineno);
133 * Search the tables for _ddebug's which match the given `query' and
134 * apply the `flags' and `mask' to them. Returns number of matching
135 * callsites, normally the same as number of changes. If verbose,
136 * logs the changes. Takes ddebug_lock.
138 static int ddebug_change(const struct ddebug_query *query,
139 unsigned int flags, unsigned int mask)
142 struct ddebug_table *dt;
143 unsigned int newflags;
144 unsigned int nfound = 0;
145 struct flagsbuf fbuf;
147 /* search for matching ddebugs */
148 mutex_lock(&ddebug_lock);
149 list_for_each_entry(dt, &ddebug_tables, link) {
151 /* match against the module name */
153 !match_wildcard(query->module, dt->mod_name))
156 for (i = 0; i < dt->num_ddebugs; i++) {
157 struct _ddebug *dp = &dt->ddebugs[i];
159 /* match against the source filename */
160 if (query->filename &&
161 !match_wildcard(query->filename, dp->filename) &&
162 !match_wildcard(query->filename,
163 kbasename(dp->filename)) &&
164 !match_wildcard(query->filename,
165 trim_prefix(dp->filename)))
168 /* match against the function */
169 if (query->function &&
170 !match_wildcard(query->function, dp->function))
173 /* match against the format */
175 !strstr(dp->format, query->format))
178 /* match against the line number range */
179 if (query->first_lineno &&
180 dp->lineno < query->first_lineno)
182 if (query->last_lineno &&
183 dp->lineno > query->last_lineno)
188 newflags = (dp->flags & mask) | flags;
189 if (newflags == dp->flags)
191 #ifdef CONFIG_JUMP_LABEL
192 if (dp->flags & _DPRINTK_FLAGS_PRINT) {
193 if (!(flags & _DPRINTK_FLAGS_PRINT))
194 static_branch_disable(&dp->key.dd_key_true);
195 } else if (flags & _DPRINTK_FLAGS_PRINT)
196 static_branch_enable(&dp->key.dd_key_true);
198 dp->flags = newflags;
199 vpr_info("changed %s:%d [%s]%s =%s\n",
200 trim_prefix(dp->filename), dp->lineno,
201 dt->mod_name, dp->function,
202 ddebug_describe_flags(dp->flags, &fbuf));
205 mutex_unlock(&ddebug_lock);
207 if (!nfound && verbose)
208 pr_info("no matches for query\n");
214 * Split the buffer `buf' into space-separated words.
215 * Handles simple " and ' quoting, i.e. without nested,
216 * embedded or escaped \". Return the number of words
219 static int ddebug_tokenize(char *buf, char *words[], int maxwords)
226 /* Skip leading whitespace */
227 buf = skip_spaces(buf);
229 break; /* oh, it was trailing whitespace */
231 break; /* token starts comment, skip rest of line */
233 /* find `end' of word, whitespace separated or quoted */
234 if (*buf == '"' || *buf == '\'') {
236 for (end = buf; *end && *end != quote; end++)
239 pr_err("unclosed quote: %s\n", buf);
240 return -EINVAL; /* unclosed quote */
243 for (end = buf; *end && !isspace(*end); end++)
248 /* `buf' is start of word, `end' is one past its end */
249 if (nwords == maxwords) {
250 pr_err("too many words, legal max <=%d\n", maxwords);
251 return -EINVAL; /* ran out of words[] before bytes */
254 *end++ = '\0'; /* terminate the word */
255 words[nwords++] = buf;
261 pr_info("split into words:");
262 for (i = 0; i < nwords; i++)
263 pr_cont(" \"%s\"", words[i]);
271 * Parse a single line number. Note that the empty string ""
272 * is treated as a special case and converted to zero, which
273 * is later treated as a "don't care" value.
275 static inline int parse_lineno(const char *str, unsigned int *val)
282 if (kstrtouint(str, 10, val) < 0) {
283 pr_err("bad line-number: %s\n", str);
289 static int check_set(const char **dest, char *src, char *name)
295 pr_err("match-spec:%s val:%s overridden by %s\n",
303 * Parse words[] as a ddebug query specification, which is a series
304 * of (keyword, value) pairs chosen from these possibilities:
306 * func <function-name>
307 * file <full-pathname>
308 * file <base-filename>
309 * module <module-name>
310 * format <escaped-string-to-find-in-format>
312 * line <first-lineno>-<last-lineno> // where either may be empty
314 * Only 1 of each type is allowed.
315 * Returns 0 on success, <0 on error.
317 static int ddebug_parse_query(char *words[], int nwords,
318 struct ddebug_query *query, const char *modname)
323 /* check we have an even number of words */
324 if (nwords % 2 != 0) {
325 pr_err("expecting pairs of match-spec <value>\n");
328 memset(query, 0, sizeof(*query));
330 for (i = 0; i < nwords; i += 2) {
331 if (!strcmp(words[i], "func")) {
332 rc = check_set(&query->function, words[i+1], "func");
333 } else if (!strcmp(words[i], "file")) {
334 rc = check_set(&query->filename, words[i+1], "file");
335 } else if (!strcmp(words[i], "module")) {
336 rc = check_set(&query->module, words[i+1], "module");
337 } else if (!strcmp(words[i], "format")) {
338 string_unescape_inplace(words[i+1], UNESCAPE_SPACE |
341 rc = check_set(&query->format, words[i+1], "format");
342 } else if (!strcmp(words[i], "line")) {
343 char *first = words[i+1];
344 char *last = strchr(first, '-');
345 if (query->first_lineno || query->last_lineno) {
346 pr_err("match-spec: line used 2x\n");
351 if (parse_lineno(first, &query->first_lineno) < 0)
354 /* range <first>-<last> */
355 if (parse_lineno(last, &query->last_lineno) < 0)
358 /* special case for last lineno not specified */
359 if (query->last_lineno == 0)
360 query->last_lineno = UINT_MAX;
362 if (query->last_lineno < query->first_lineno) {
363 pr_err("last-line:%d < 1st-line:%d\n",
365 query->first_lineno);
369 query->last_lineno = query->first_lineno;
372 pr_err("unknown keyword \"%s\"\n", words[i]);
378 if (!query->module && modname)
380 * support $modname.dyndbg=<multiple queries>, when
381 * not given in the query itself
383 query->module = modname;
385 vpr_info_dq(query, "parsed");
390 * Parse `str' as a flags specification, format [-+=][p]+.
391 * Sets up *maskp and *flagsp to be used when changing the
392 * flags fields of matched _ddebug's. Returns 0 on success
395 static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
408 pr_err("bad flag-op %c, at start of %s\n", *str, str);
411 vpr_info("op='%c'\n", op);
413 for (; *str ; ++str) {
414 for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
415 if (*str == opt_array[i].opt_char) {
416 flags |= opt_array[i].flag;
421 pr_err("unknown flag '%c' in \"%s\"\n", *str, str);
425 vpr_info("flags=0x%x\n", flags);
427 /* calculate final *flagsp, *maskp according to mask and op */
442 vpr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp, *maskp);
446 static int ddebug_exec_query(char *query_string, const char *modname)
448 unsigned int flags = 0, mask = 0;
449 struct ddebug_query query;
452 char *words[MAXWORDS];
454 nwords = ddebug_tokenize(query_string, words, MAXWORDS);
456 pr_err("tokenize failed\n");
459 /* check flags 1st (last arg) so query is pairs of spec,val */
460 if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) {
461 pr_err("flags parse failed\n");
464 if (ddebug_parse_query(words, nwords-1, &query, modname)) {
465 pr_err("query parse failed\n");
468 /* actually go and implement the change */
469 nfound = ddebug_change(&query, flags, mask);
470 vpr_info_dq(&query, nfound ? "applied" : "no-match");
475 /* handle multiple queries in query string, continue on error, return
476 last error or number of matching callsites. Module name is either
477 in param (for boot arg) or perhaps in query string.
479 static int ddebug_exec_queries(char *query, const char *modname)
482 int i, errs = 0, exitcode = 0, rc, nfound = 0;
484 for (i = 0; query; query = split) {
485 split = strpbrk(query, ";\n");
489 query = skip_spaces(query);
490 if (!query || !*query || *query == '#')
493 vpr_info("query %d: \"%s\"\n", i, query);
495 rc = ddebug_exec_query(query, modname);
504 vpr_info("processed %d queries, with %d matches, %d errs\n",
512 #define PREFIX_SIZE 64
514 static int remaining(int wrote)
516 if (PREFIX_SIZE - wrote > 0)
517 return PREFIX_SIZE - wrote;
521 static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf)
528 if (desc->flags & _DPRINTK_FLAGS_INCL_TID) {
530 pos += snprintf(buf + pos, remaining(pos), "<intr> ");
532 pos += snprintf(buf + pos, remaining(pos), "[%d] ",
533 task_pid_vnr(current));
536 if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME)
537 pos += snprintf(buf + pos, remaining(pos), "%s:",
539 if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME)
540 pos += snprintf(buf + pos, remaining(pos), "%s:",
542 if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO)
543 pos += snprintf(buf + pos, remaining(pos), "%d:",
545 if (pos - pos_after_tid)
546 pos += snprintf(buf + pos, remaining(pos), " ");
547 if (pos >= PREFIX_SIZE)
548 buf[PREFIX_SIZE - 1] = '\0';
553 void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
556 struct va_format vaf;
557 char buf[PREFIX_SIZE];
567 printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf);
571 EXPORT_SYMBOL(__dynamic_pr_debug);
573 void __dynamic_dev_dbg(struct _ddebug *descriptor,
574 const struct device *dev, const char *fmt, ...)
576 struct va_format vaf;
588 printk(KERN_DEBUG "(NULL device *): %pV", &vaf);
590 char buf[PREFIX_SIZE];
592 dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV",
593 dynamic_emit_prefix(descriptor, buf),
594 dev_driver_string(dev), dev_name(dev),
600 EXPORT_SYMBOL(__dynamic_dev_dbg);
604 void __dynamic_netdev_dbg(struct _ddebug *descriptor,
605 const struct net_device *dev, const char *fmt, ...)
607 struct va_format vaf;
618 if (dev && dev->dev.parent) {
619 char buf[PREFIX_SIZE];
621 dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent,
623 dynamic_emit_prefix(descriptor, buf),
624 dev_driver_string(dev->dev.parent),
625 dev_name(dev->dev.parent),
626 netdev_name(dev), netdev_reg_state(dev),
629 printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev),
630 netdev_reg_state(dev), &vaf);
632 printk(KERN_DEBUG "(NULL net_device): %pV", &vaf);
637 EXPORT_SYMBOL(__dynamic_netdev_dbg);
641 #define DDEBUG_STRING_SIZE 1024
642 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE];
644 static __init int ddebug_setup_query(char *str)
646 if (strlen(str) >= DDEBUG_STRING_SIZE) {
647 pr_warn("ddebug boot param string too large\n");
650 strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE);
654 __setup("ddebug_query=", ddebug_setup_query);
657 * File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the
658 * command text from userspace, parses and executes it.
660 #define USER_BUF_PAGE 4096
661 static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
662 size_t len, loff_t *offp)
669 if (len > USER_BUF_PAGE - 1) {
670 pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE);
673 tmpbuf = memdup_user_nul(ubuf, len);
675 return PTR_ERR(tmpbuf);
676 vpr_info("read %d bytes from userspace\n", (int)len);
678 ret = ddebug_exec_queries(tmpbuf, NULL);
688 * Set the iterator to point to the first _ddebug object
689 * and return a pointer to that first object. Returns
690 * NULL if there are no _ddebugs at all.
692 static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter)
694 if (list_empty(&ddebug_tables)) {
699 iter->table = list_entry(ddebug_tables.next,
700 struct ddebug_table, link);
702 return &iter->table->ddebugs[iter->idx];
706 * Advance the iterator to point to the next _ddebug
707 * object from the one the iterator currently points at,
708 * and returns a pointer to the new _ddebug. Returns
709 * NULL if the iterator has seen all the _ddebugs.
711 static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter)
713 if (iter->table == NULL)
715 if (++iter->idx == iter->table->num_ddebugs) {
716 /* iterate to next table */
718 if (list_is_last(&iter->table->link, &ddebug_tables)) {
722 iter->table = list_entry(iter->table->link.next,
723 struct ddebug_table, link);
725 return &iter->table->ddebugs[iter->idx];
729 * Seq_ops start method. Called at the start of every
730 * read() call from userspace. Takes the ddebug_lock and
731 * seeks the seq_file's iterator to the given position.
733 static void *ddebug_proc_start(struct seq_file *m, loff_t *pos)
735 struct ddebug_iter *iter = m->private;
739 vpr_info("called m=%p *pos=%lld\n", m, (unsigned long long)*pos);
741 mutex_lock(&ddebug_lock);
744 return SEQ_START_TOKEN;
747 dp = ddebug_iter_first(iter);
748 while (dp != NULL && --n > 0)
749 dp = ddebug_iter_next(iter);
754 * Seq_ops next method. Called several times within a read()
755 * call from userspace, with ddebug_lock held. Walks to the
756 * next _ddebug object with a special case for the header line.
758 static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
760 struct ddebug_iter *iter = m->private;
763 vpr_info("called m=%p p=%p *pos=%lld\n",
764 m, p, (unsigned long long)*pos);
766 if (p == SEQ_START_TOKEN)
767 dp = ddebug_iter_first(iter);
769 dp = ddebug_iter_next(iter);
775 * Seq_ops show method. Called several times within a read()
776 * call from userspace, with ddebug_lock held. Formats the
777 * current _ddebug as a single human-readable line, with a
778 * special case for the header line.
780 static int ddebug_proc_show(struct seq_file *m, void *p)
782 struct ddebug_iter *iter = m->private;
783 struct _ddebug *dp = p;
784 struct flagsbuf flags;
786 vpr_info("called m=%p p=%p\n", m, p);
788 if (p == SEQ_START_TOKEN) {
790 "# filename:lineno [module]function flags format\n");
794 seq_printf(m, "%s:%u [%s]%s =%s \"",
795 trim_prefix(dp->filename), dp->lineno,
796 iter->table->mod_name, dp->function,
797 ddebug_describe_flags(dp->flags, &flags));
798 seq_escape(m, dp->format, "\t\r\n\"");
805 * Seq_ops stop method. Called at the end of each read()
806 * call from userspace. Drops ddebug_lock.
808 static void ddebug_proc_stop(struct seq_file *m, void *p)
810 vpr_info("called m=%p p=%p\n", m, p);
811 mutex_unlock(&ddebug_lock);
814 static const struct seq_operations ddebug_proc_seqops = {
815 .start = ddebug_proc_start,
816 .next = ddebug_proc_next,
817 .show = ddebug_proc_show,
818 .stop = ddebug_proc_stop
822 * File_ops->open method for <debugfs>/dynamic_debug/control. Does
823 * the seq_file setup dance, and also creates an iterator to walk the
824 * _ddebugs. Note that we create a seq_file always, even for O_WRONLY
825 * files where it's not needed, as doing so simplifies the ->release
828 static int ddebug_proc_open(struct inode *inode, struct file *file)
830 vpr_info("called\n");
831 return seq_open_private(file, &ddebug_proc_seqops,
832 sizeof(struct ddebug_iter));
835 static const struct file_operations ddebug_proc_fops = {
836 .owner = THIS_MODULE,
837 .open = ddebug_proc_open,
840 .release = seq_release_private,
841 .write = ddebug_proc_write
845 * Allocate a new ddebug_table for the given module
846 * and add it to the global list.
848 int ddebug_add_module(struct _ddebug *tab, unsigned int n,
851 struct ddebug_table *dt;
852 const char *new_name;
854 dt = kzalloc(sizeof(*dt), GFP_KERNEL);
857 new_name = kstrdup_const(name, GFP_KERNEL);
858 if (new_name == NULL) {
862 dt->mod_name = new_name;
866 mutex_lock(&ddebug_lock);
867 list_add_tail(&dt->link, &ddebug_tables);
868 mutex_unlock(&ddebug_lock);
870 vpr_info("%u debug prints in module %s\n", n, dt->mod_name);
873 EXPORT_SYMBOL_GPL(ddebug_add_module);
875 /* helper for ddebug_dyndbg_(boot|module)_param_cb */
876 static int ddebug_dyndbg_param_cb(char *param, char *val,
877 const char *modname, int on_err)
881 sep = strchr(param, '.');
883 /* needed only for ddebug_dyndbg_boot_param_cb */
888 if (strcmp(param, "dyndbg"))
889 return on_err; /* determined by caller */
891 ddebug_exec_queries((val ? val : "+p"), modname);
893 return 0; /* query failure shouldnt stop module load */
896 /* handle both dyndbg and $module.dyndbg params at boot */
897 static int ddebug_dyndbg_boot_param_cb(char *param, char *val,
898 const char *unused, void *arg)
900 vpr_info("%s=\"%s\"\n", param, val);
901 return ddebug_dyndbg_param_cb(param, val, NULL, 0);
905 * modprobe foo finds foo.params in boot-args, strips "foo.", and
906 * passes them to load_module(). This callback gets unknown params,
907 * processes dyndbg params, rejects others.
909 int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module)
911 vpr_info("module: %s %s=\"%s\"\n", module, param, val);
912 return ddebug_dyndbg_param_cb(param, val, module, -ENOENT);
915 static void ddebug_table_free(struct ddebug_table *dt)
917 list_del_init(&dt->link);
918 kfree_const(dt->mod_name);
923 * Called in response to a module being unloaded. Removes
924 * any ddebug_table's which point at the module.
926 int ddebug_remove_module(const char *mod_name)
928 struct ddebug_table *dt, *nextdt;
931 vpr_info("removing module \"%s\"\n", mod_name);
933 mutex_lock(&ddebug_lock);
934 list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
935 if (!strcmp(dt->mod_name, mod_name)) {
936 ddebug_table_free(dt);
940 mutex_unlock(&ddebug_lock);
943 EXPORT_SYMBOL_GPL(ddebug_remove_module);
945 static void ddebug_remove_all_tables(void)
947 mutex_lock(&ddebug_lock);
948 while (!list_empty(&ddebug_tables)) {
949 struct ddebug_table *dt = list_entry(ddebug_tables.next,
952 ddebug_table_free(dt);
954 mutex_unlock(&ddebug_lock);
957 static __initdata int ddebug_init_success;
959 static int __init dynamic_debug_init_debugfs(void)
961 struct dentry *dir, *file;
963 if (!ddebug_init_success)
966 dir = debugfs_create_dir("dynamic_debug", NULL);
969 file = debugfs_create_file("control", 0644, dir, NULL,
978 static int __init dynamic_debug_init(void)
980 struct _ddebug *iter, *iter_start;
981 const char *modname = NULL;
984 int n = 0, entries = 0, modct = 0;
985 int verbose_bytes = 0;
987 if (&__start___verbose == &__stop___verbose) {
988 pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n");
991 iter = __start___verbose;
992 modname = iter->modname;
994 for (; iter < __stop___verbose; iter++) {
996 verbose_bytes += strlen(iter->modname) + strlen(iter->function)
997 + strlen(iter->filename) + strlen(iter->format);
999 if (strcmp(modname, iter->modname)) {
1001 ret = ddebug_add_module(iter_start, n, modname);
1005 modname = iter->modname;
1010 ret = ddebug_add_module(iter_start, n, modname);
1014 ddebug_init_success = 1;
1015 vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in (readonly) verbose section\n",
1016 modct, entries, (int)(modct * sizeof(struct ddebug_table)),
1017 verbose_bytes + (int)(__stop___verbose - __start___verbose));
1019 /* apply ddebug_query boot param, dont unload tables on err */
1020 if (ddebug_setup_string[0] != '\0') {
1021 pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n");
1022 ret = ddebug_exec_queries(ddebug_setup_string, NULL);
1024 pr_warn("Invalid ddebug boot param %s\n",
1025 ddebug_setup_string);
1027 pr_info("%d changes by ddebug_query\n", ret);
1029 /* now that ddebug tables are loaded, process all boot args
1030 * again to find and activate queries given in dyndbg params.
1031 * While this has already been done for known boot params, it
1032 * ignored the unknown ones (dyndbg in particular). Reusing
1033 * parse_args avoids ad-hoc parsing. This will also attempt
1034 * to activate queries for not-yet-loaded modules, which is
1035 * slightly noisy if verbose, but harmless.
1037 cmdline = kstrdup(saved_command_line, GFP_KERNEL);
1038 parse_args("dyndbg params", cmdline, NULL,
1039 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb);
1044 ddebug_remove_all_tables();
1047 /* Allow early initialization for boot messages via boot param */
1048 early_initcall(dynamic_debug_init);
1050 /* Debugfs setup must be done later */
1051 fs_initcall(dynamic_debug_init_debugfs);