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++)
246 pr_err("parse err after word:%d=%s\n", nwords,
247 nwords ? words[nwords - 1] : "<none>");
252 /* `buf' is start of word, `end' is one past its end */
253 if (nwords == maxwords) {
254 pr_err("too many words, legal max <=%d\n", maxwords);
255 return -EINVAL; /* ran out of words[] before bytes */
258 *end++ = '\0'; /* terminate the word */
259 words[nwords++] = buf;
265 pr_info("split into words:");
266 for (i = 0; i < nwords; i++)
267 pr_cont(" \"%s\"", words[i]);
275 * Parse a single line number. Note that the empty string ""
276 * is treated as a special case and converted to zero, which
277 * is later treated as a "don't care" value.
279 static inline int parse_lineno(const char *str, unsigned int *val)
286 if (kstrtouint(str, 10, val) < 0) {
287 pr_err("bad line-number: %s\n", str);
293 static int check_set(const char **dest, char *src, char *name)
299 pr_err("match-spec:%s val:%s overridden by %s\n",
307 * Parse words[] as a ddebug query specification, which is a series
308 * of (keyword, value) pairs chosen from these possibilities:
310 * func <function-name>
311 * file <full-pathname>
312 * file <base-filename>
313 * module <module-name>
314 * format <escaped-string-to-find-in-format>
316 * line <first-lineno>-<last-lineno> // where either may be empty
318 * Only 1 of each type is allowed.
319 * Returns 0 on success, <0 on error.
321 static int ddebug_parse_query(char *words[], int nwords,
322 struct ddebug_query *query, const char *modname)
327 /* check we have an even number of words */
328 if (nwords % 2 != 0) {
329 pr_err("expecting pairs of match-spec <value>\n");
332 memset(query, 0, sizeof(*query));
334 for (i = 0; i < nwords; i += 2) {
335 if (!strcmp(words[i], "func")) {
336 rc = check_set(&query->function, words[i+1], "func");
337 } else if (!strcmp(words[i], "file")) {
338 rc = check_set(&query->filename, words[i+1], "file");
339 } else if (!strcmp(words[i], "module")) {
340 rc = check_set(&query->module, words[i+1], "module");
341 } else if (!strcmp(words[i], "format")) {
342 string_unescape_inplace(words[i+1], UNESCAPE_SPACE |
345 rc = check_set(&query->format, words[i+1], "format");
346 } else if (!strcmp(words[i], "line")) {
347 char *first = words[i+1];
348 char *last = strchr(first, '-');
349 if (query->first_lineno || query->last_lineno) {
350 pr_err("match-spec: line used 2x\n");
355 if (parse_lineno(first, &query->first_lineno) < 0)
358 /* range <first>-<last> */
359 if (parse_lineno(last, &query->last_lineno) < 0)
362 /* special case for last lineno not specified */
363 if (query->last_lineno == 0)
364 query->last_lineno = UINT_MAX;
366 if (query->last_lineno < query->first_lineno) {
367 pr_err("last-line:%d < 1st-line:%d\n",
369 query->first_lineno);
373 query->last_lineno = query->first_lineno;
376 pr_err("unknown keyword \"%s\"\n", words[i]);
382 if (!query->module && modname)
384 * support $modname.dyndbg=<multiple queries>, when
385 * not given in the query itself
387 query->module = modname;
389 vpr_info_dq(query, "parsed");
394 * Parse `str' as a flags specification, format [-+=][p]+.
395 * Sets up *maskp and *flagsp to be used when changing the
396 * flags fields of matched _ddebug's. Returns 0 on success
399 static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
412 pr_err("bad flag-op %c, at start of %s\n", *str, str);
415 vpr_info("op='%c'\n", op);
417 for (; *str ; ++str) {
418 for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
419 if (*str == opt_array[i].opt_char) {
420 flags |= opt_array[i].flag;
425 pr_err("unknown flag '%c' in \"%s\"\n", *str, str);
429 vpr_info("flags=0x%x\n", flags);
431 /* calculate final *flagsp, *maskp according to mask and op */
446 vpr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp, *maskp);
450 static int ddebug_exec_query(char *query_string, const char *modname)
452 unsigned int flags = 0, mask = 0;
453 struct ddebug_query query;
456 char *words[MAXWORDS];
458 nwords = ddebug_tokenize(query_string, words, MAXWORDS);
460 pr_err("tokenize failed\n");
463 /* check flags 1st (last arg) so query is pairs of spec,val */
464 if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) {
465 pr_err("flags parse failed\n");
468 if (ddebug_parse_query(words, nwords-1, &query, modname)) {
469 pr_err("query parse failed\n");
472 /* actually go and implement the change */
473 nfound = ddebug_change(&query, flags, mask);
474 vpr_info_dq(&query, nfound ? "applied" : "no-match");
479 /* handle multiple queries in query string, continue on error, return
480 last error or number of matching callsites. Module name is either
481 in param (for boot arg) or perhaps in query string.
483 static int ddebug_exec_queries(char *query, const char *modname)
486 int i, errs = 0, exitcode = 0, rc, nfound = 0;
488 for (i = 0; query; query = split) {
489 split = strpbrk(query, ";\n");
493 query = skip_spaces(query);
494 if (!query || !*query || *query == '#')
497 vpr_info("query %d: \"%s\"\n", i, query);
499 rc = ddebug_exec_query(query, modname);
508 vpr_info("processed %d queries, with %d matches, %d errs\n",
516 #define PREFIX_SIZE 64
518 static int remaining(int wrote)
520 if (PREFIX_SIZE - wrote > 0)
521 return PREFIX_SIZE - wrote;
525 static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf)
532 if (desc->flags & _DPRINTK_FLAGS_INCL_TID) {
534 pos += snprintf(buf + pos, remaining(pos), "<intr> ");
536 pos += snprintf(buf + pos, remaining(pos), "[%d] ",
537 task_pid_vnr(current));
540 if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME)
541 pos += snprintf(buf + pos, remaining(pos), "%s:",
543 if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME)
544 pos += snprintf(buf + pos, remaining(pos), "%s:",
546 if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO)
547 pos += snprintf(buf + pos, remaining(pos), "%d:",
549 if (pos - pos_after_tid)
550 pos += snprintf(buf + pos, remaining(pos), " ");
551 if (pos >= PREFIX_SIZE)
552 buf[PREFIX_SIZE - 1] = '\0';
557 void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
560 struct va_format vaf;
561 char buf[PREFIX_SIZE];
571 printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf);
575 EXPORT_SYMBOL(__dynamic_pr_debug);
577 void __dynamic_dev_dbg(struct _ddebug *descriptor,
578 const struct device *dev, const char *fmt, ...)
580 struct va_format vaf;
592 printk(KERN_DEBUG "(NULL device *): %pV", &vaf);
594 char buf[PREFIX_SIZE];
596 dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV",
597 dynamic_emit_prefix(descriptor, buf),
598 dev_driver_string(dev), dev_name(dev),
604 EXPORT_SYMBOL(__dynamic_dev_dbg);
608 void __dynamic_netdev_dbg(struct _ddebug *descriptor,
609 const struct net_device *dev, const char *fmt, ...)
611 struct va_format vaf;
622 if (dev && dev->dev.parent) {
623 char buf[PREFIX_SIZE];
625 dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent,
627 dynamic_emit_prefix(descriptor, buf),
628 dev_driver_string(dev->dev.parent),
629 dev_name(dev->dev.parent),
630 netdev_name(dev), netdev_reg_state(dev),
633 printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev),
634 netdev_reg_state(dev), &vaf);
636 printk(KERN_DEBUG "(NULL net_device): %pV", &vaf);
641 EXPORT_SYMBOL(__dynamic_netdev_dbg);
645 #define DDEBUG_STRING_SIZE 1024
646 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE];
648 static __init int ddebug_setup_query(char *str)
650 if (strlen(str) >= DDEBUG_STRING_SIZE) {
651 pr_warn("ddebug boot param string too large\n");
654 strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE);
658 __setup("ddebug_query=", ddebug_setup_query);
661 * File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the
662 * command text from userspace, parses and executes it.
664 #define USER_BUF_PAGE 4096
665 static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
666 size_t len, loff_t *offp)
673 if (len > USER_BUF_PAGE - 1) {
674 pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE);
677 tmpbuf = memdup_user_nul(ubuf, len);
679 return PTR_ERR(tmpbuf);
680 vpr_info("read %d bytes from userspace\n", (int)len);
682 ret = ddebug_exec_queries(tmpbuf, NULL);
692 * Set the iterator to point to the first _ddebug object
693 * and return a pointer to that first object. Returns
694 * NULL if there are no _ddebugs at all.
696 static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter)
698 if (list_empty(&ddebug_tables)) {
703 iter->table = list_entry(ddebug_tables.next,
704 struct ddebug_table, link);
706 return &iter->table->ddebugs[iter->idx];
710 * Advance the iterator to point to the next _ddebug
711 * object from the one the iterator currently points at,
712 * and returns a pointer to the new _ddebug. Returns
713 * NULL if the iterator has seen all the _ddebugs.
715 static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter)
717 if (iter->table == NULL)
719 if (++iter->idx == iter->table->num_ddebugs) {
720 /* iterate to next table */
722 if (list_is_last(&iter->table->link, &ddebug_tables)) {
726 iter->table = list_entry(iter->table->link.next,
727 struct ddebug_table, link);
729 return &iter->table->ddebugs[iter->idx];
733 * Seq_ops start method. Called at the start of every
734 * read() call from userspace. Takes the ddebug_lock and
735 * seeks the seq_file's iterator to the given position.
737 static void *ddebug_proc_start(struct seq_file *m, loff_t *pos)
739 struct ddebug_iter *iter = m->private;
743 vpr_info("called m=%p *pos=%lld\n", m, (unsigned long long)*pos);
745 mutex_lock(&ddebug_lock);
748 return SEQ_START_TOKEN;
751 dp = ddebug_iter_first(iter);
752 while (dp != NULL && --n > 0)
753 dp = ddebug_iter_next(iter);
758 * Seq_ops next method. Called several times within a read()
759 * call from userspace, with ddebug_lock held. Walks to the
760 * next _ddebug object with a special case for the header line.
762 static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
764 struct ddebug_iter *iter = m->private;
767 vpr_info("called m=%p p=%p *pos=%lld\n",
768 m, p, (unsigned long long)*pos);
770 if (p == SEQ_START_TOKEN)
771 dp = ddebug_iter_first(iter);
773 dp = ddebug_iter_next(iter);
779 * Seq_ops show method. Called several times within a read()
780 * call from userspace, with ddebug_lock held. Formats the
781 * current _ddebug as a single human-readable line, with a
782 * special case for the header line.
784 static int ddebug_proc_show(struct seq_file *m, void *p)
786 struct ddebug_iter *iter = m->private;
787 struct _ddebug *dp = p;
788 struct flagsbuf flags;
790 vpr_info("called m=%p p=%p\n", m, p);
792 if (p == SEQ_START_TOKEN) {
794 "# filename:lineno [module]function flags format\n");
798 seq_printf(m, "%s:%u [%s]%s =%s \"",
799 trim_prefix(dp->filename), dp->lineno,
800 iter->table->mod_name, dp->function,
801 ddebug_describe_flags(dp->flags, &flags));
802 seq_escape(m, dp->format, "\t\r\n\"");
809 * Seq_ops stop method. Called at the end of each read()
810 * call from userspace. Drops ddebug_lock.
812 static void ddebug_proc_stop(struct seq_file *m, void *p)
814 vpr_info("called m=%p p=%p\n", m, p);
815 mutex_unlock(&ddebug_lock);
818 static const struct seq_operations ddebug_proc_seqops = {
819 .start = ddebug_proc_start,
820 .next = ddebug_proc_next,
821 .show = ddebug_proc_show,
822 .stop = ddebug_proc_stop
826 * File_ops->open method for <debugfs>/dynamic_debug/control. Does
827 * the seq_file setup dance, and also creates an iterator to walk the
828 * _ddebugs. Note that we create a seq_file always, even for O_WRONLY
829 * files where it's not needed, as doing so simplifies the ->release
832 static int ddebug_proc_open(struct inode *inode, struct file *file)
834 vpr_info("called\n");
835 return seq_open_private(file, &ddebug_proc_seqops,
836 sizeof(struct ddebug_iter));
839 static const struct file_operations ddebug_proc_fops = {
840 .owner = THIS_MODULE,
841 .open = ddebug_proc_open,
844 .release = seq_release_private,
845 .write = ddebug_proc_write
849 * Allocate a new ddebug_table for the given module
850 * and add it to the global list.
852 int ddebug_add_module(struct _ddebug *tab, unsigned int n,
855 struct ddebug_table *dt;
856 const char *new_name;
858 dt = kzalloc(sizeof(*dt), GFP_KERNEL);
861 new_name = kstrdup_const(name, GFP_KERNEL);
862 if (new_name == NULL) {
866 dt->mod_name = new_name;
870 mutex_lock(&ddebug_lock);
871 list_add_tail(&dt->link, &ddebug_tables);
872 mutex_unlock(&ddebug_lock);
874 vpr_info("%u debug prints in module %s\n", n, dt->mod_name);
877 EXPORT_SYMBOL_GPL(ddebug_add_module);
879 /* helper for ddebug_dyndbg_(boot|module)_param_cb */
880 static int ddebug_dyndbg_param_cb(char *param, char *val,
881 const char *modname, int on_err)
885 sep = strchr(param, '.');
887 /* needed only for ddebug_dyndbg_boot_param_cb */
892 if (strcmp(param, "dyndbg"))
893 return on_err; /* determined by caller */
895 ddebug_exec_queries((val ? val : "+p"), modname);
897 return 0; /* query failure shouldnt stop module load */
900 /* handle both dyndbg and $module.dyndbg params at boot */
901 static int ddebug_dyndbg_boot_param_cb(char *param, char *val,
902 const char *unused, void *arg)
904 vpr_info("%s=\"%s\"\n", param, val);
905 return ddebug_dyndbg_param_cb(param, val, NULL, 0);
909 * modprobe foo finds foo.params in boot-args, strips "foo.", and
910 * passes them to load_module(). This callback gets unknown params,
911 * processes dyndbg params, rejects others.
913 int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module)
915 vpr_info("module: %s %s=\"%s\"\n", module, param, val);
916 return ddebug_dyndbg_param_cb(param, val, module, -ENOENT);
919 static void ddebug_table_free(struct ddebug_table *dt)
921 list_del_init(&dt->link);
922 kfree_const(dt->mod_name);
927 * Called in response to a module being unloaded. Removes
928 * any ddebug_table's which point at the module.
930 int ddebug_remove_module(const char *mod_name)
932 struct ddebug_table *dt, *nextdt;
935 vpr_info("removing module \"%s\"\n", mod_name);
937 mutex_lock(&ddebug_lock);
938 list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
939 if (!strcmp(dt->mod_name, mod_name)) {
940 ddebug_table_free(dt);
944 mutex_unlock(&ddebug_lock);
947 EXPORT_SYMBOL_GPL(ddebug_remove_module);
949 static void ddebug_remove_all_tables(void)
951 mutex_lock(&ddebug_lock);
952 while (!list_empty(&ddebug_tables)) {
953 struct ddebug_table *dt = list_entry(ddebug_tables.next,
956 ddebug_table_free(dt);
958 mutex_unlock(&ddebug_lock);
961 static __initdata int ddebug_init_success;
963 static int __init dynamic_debug_init_debugfs(void)
965 struct dentry *dir, *file;
967 if (!ddebug_init_success)
970 dir = debugfs_create_dir("dynamic_debug", NULL);
973 file = debugfs_create_file("control", 0644, dir, NULL,
982 static int __init dynamic_debug_init(void)
984 struct _ddebug *iter, *iter_start;
985 const char *modname = NULL;
988 int n = 0, entries = 0, modct = 0;
989 int verbose_bytes = 0;
991 if (&__start___verbose == &__stop___verbose) {
992 pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n");
995 iter = __start___verbose;
996 modname = iter->modname;
998 for (; iter < __stop___verbose; iter++) {
1000 verbose_bytes += strlen(iter->modname) + strlen(iter->function)
1001 + strlen(iter->filename) + strlen(iter->format);
1003 if (strcmp(modname, iter->modname)) {
1005 ret = ddebug_add_module(iter_start, n, modname);
1009 modname = iter->modname;
1014 ret = ddebug_add_module(iter_start, n, modname);
1018 ddebug_init_success = 1;
1019 vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in (readonly) verbose section\n",
1020 modct, entries, (int)(modct * sizeof(struct ddebug_table)),
1021 verbose_bytes + (int)(__stop___verbose - __start___verbose));
1023 /* apply ddebug_query boot param, dont unload tables on err */
1024 if (ddebug_setup_string[0] != '\0') {
1025 pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n");
1026 ret = ddebug_exec_queries(ddebug_setup_string, NULL);
1028 pr_warn("Invalid ddebug boot param %s\n",
1029 ddebug_setup_string);
1031 pr_info("%d changes by ddebug_query\n", ret);
1033 /* now that ddebug tables are loaded, process all boot args
1034 * again to find and activate queries given in dyndbg params.
1035 * While this has already been done for known boot params, it
1036 * ignored the unknown ones (dyndbg in particular). Reusing
1037 * parse_args avoids ad-hoc parsing. This will also attempt
1038 * to activate queries for not-yet-loaded modules, which is
1039 * slightly noisy if verbose, but harmless.
1041 cmdline = kstrdup(saved_command_line, GFP_KERNEL);
1042 parse_args("dyndbg params", cmdline, NULL,
1043 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb);
1048 ddebug_remove_all_tables();
1051 /* Allow early initialization for boot messages via boot param */
1052 early_initcall(dynamic_debug_init);
1054 /* Debugfs setup must be done later */
1055 fs_initcall(dynamic_debug_init_debugfs);