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.
13 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/moduleparam.h>
18 #include <linux/kallsyms.h>
19 #include <linux/types.h>
20 #include <linux/mutex.h>
21 #include <linux/proc_fs.h>
22 #include <linux/seq_file.h>
23 #include <linux/list.h>
24 #include <linux/sysctl.h>
25 #include <linux/ctype.h>
26 #include <linux/string.h>
27 #include <linux/uaccess.h>
28 #include <linux/dynamic_debug.h>
29 #include <linux/debugfs.h>
30 #include <linux/slab.h>
31 #include <linux/jump_label.h>
32 #include <linux/hardirq.h>
33 #include <linux/sched.h>
34 #include <linux/device.h>
35 #include <linux/netdevice.h>
37 extern struct _ddebug __start___verbose[];
38 extern struct _ddebug __stop___verbose[];
41 struct list_head link;
43 unsigned int num_ddebugs;
44 struct _ddebug *ddebugs;
52 unsigned int first_lineno, last_lineno;
56 struct ddebug_table *table;
60 static DEFINE_MUTEX(ddebug_lock);
61 static LIST_HEAD(ddebug_tables);
62 static int verbose = 0;
63 module_param(verbose, int, 0644);
65 /* Return the last part of a pathname */
66 static inline const char *basename(const char *path)
68 const char *tail = strrchr(path, '/');
69 return tail ? tail+1 : path;
72 /* Return the path relative to source root */
73 static inline const char *trim_prefix(const char *path)
75 int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c");
77 if (strncmp(path, __FILE__, skip))
78 skip = 0; /* prefix mismatch, don't skip */
83 static struct { unsigned flag:8; char opt_char; } opt_array[] = {
84 { _DPRINTK_FLAGS_PRINT, 'p' },
85 { _DPRINTK_FLAGS_INCL_MODNAME, 'm' },
86 { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' },
87 { _DPRINTK_FLAGS_INCL_LINENO, 'l' },
88 { _DPRINTK_FLAGS_INCL_TID, 't' },
89 { _DPRINTK_FLAGS_NONE, '_' },
92 /* format a string into buf[] which describes the _ddebug's flags */
93 static char *ddebug_describe_flags(struct _ddebug *dp, char *buf,
100 for (i = 0; i < ARRAY_SIZE(opt_array); ++i)
101 if (dp->flags & opt_array[i].flag)
102 *p++ = opt_array[i].opt_char;
110 #define vpr_info(fmt, ...) \
111 if (verbose) do { pr_info(fmt, ##__VA_ARGS__); } while (0)
113 #define vpr_info_dq(q, msg) \
115 /* trim last char off format print */ \
116 vpr_info("%s: func=\"%s\" file=\"%s\" " \
117 "module=\"%s\" format=\"%.*s\" " \
120 q->function ? q->function : "", \
121 q->filename ? q->filename : "", \
122 q->module ? q->module : "", \
123 (int)(q->format ? strlen(q->format) - 1 : 0), \
124 q->format ? q->format : "", \
125 q->first_lineno, q->last_lineno); \
129 * Search the tables for _ddebug's which match the given `query' and
130 * apply the `flags' and `mask' to them. Returns number of matching
131 * callsites, normally the same as number of changes. If verbose,
132 * logs the changes. Takes ddebug_lock.
134 static int ddebug_change(const struct ddebug_query *query,
135 unsigned int flags, unsigned int mask)
138 struct ddebug_table *dt;
139 unsigned int newflags;
140 unsigned int nfound = 0;
143 /* search for matching ddebugs */
144 mutex_lock(&ddebug_lock);
145 list_for_each_entry(dt, &ddebug_tables, link) {
147 /* match against the module name */
148 if (query->module && strcmp(query->module, dt->mod_name))
151 for (i = 0 ; i < dt->num_ddebugs ; i++) {
152 struct _ddebug *dp = &dt->ddebugs[i];
154 /* match against the source filename */
155 if (query->filename &&
156 strcmp(query->filename, dp->filename) &&
157 strcmp(query->filename, basename(dp->filename)) &&
158 strcmp(query->filename, trim_prefix(dp->filename)))
161 /* match against the function */
162 if (query->function &&
163 strcmp(query->function, dp->function))
166 /* match against the format */
168 !strstr(dp->format, query->format))
171 /* match against the line number range */
172 if (query->first_lineno &&
173 dp->lineno < query->first_lineno)
175 if (query->last_lineno &&
176 dp->lineno > query->last_lineno)
181 newflags = (dp->flags & mask) | flags;
182 if (newflags == dp->flags)
184 dp->flags = newflags;
185 vpr_info("changed %s:%d [%s]%s =%s\n",
186 trim_prefix(dp->filename), dp->lineno,
187 dt->mod_name, dp->function,
188 ddebug_describe_flags(dp, flagbuf,
192 mutex_unlock(&ddebug_lock);
194 if (!nfound && verbose)
195 pr_info("no matches for query\n");
201 * Split the buffer `buf' into space-separated words.
202 * Handles simple " and ' quoting, i.e. without nested,
203 * embedded or escaped \". Return the number of words
206 static int ddebug_tokenize(char *buf, char *words[], int maxwords)
213 /* Skip leading whitespace */
214 buf = skip_spaces(buf);
216 break; /* oh, it was trailing whitespace */
218 break; /* token starts comment, skip rest of line */
220 /* find `end' of word, whitespace separated or quoted */
221 if (*buf == '"' || *buf == '\'') {
223 for (end = buf ; *end && *end != quote ; end++)
226 return -EINVAL; /* unclosed quote */
228 for (end = buf ; *end && !isspace(*end) ; end++)
233 /* `buf' is start of word, `end' is one past its end */
234 if (nwords == maxwords)
235 return -EINVAL; /* ran out of words[] before bytes */
237 *end++ = '\0'; /* terminate the word */
238 words[nwords++] = buf;
244 pr_info("split into words:");
245 for (i = 0 ; i < nwords ; i++)
246 pr_cont(" \"%s\"", words[i]);
254 * Parse a single line number. Note that the empty string ""
255 * is treated as a special case and converted to zero, which
256 * is later treated as a "don't care" value.
258 static inline int parse_lineno(const char *str, unsigned int *val)
266 *val = simple_strtoul(str, &end, 10);
267 return end == NULL || end == str || *end != '\0' ? -EINVAL : 0;
271 * Undo octal escaping in a string, inplace. This is useful to
272 * allow the user to express a query which matches a format
273 * containing embedded spaces.
275 #define isodigit(c) ((c) >= '0' && (c) <= '7')
276 static char *unescape(char *str)
287 } else if (in[1] == 't') {
291 } else if (in[1] == 'n') {
295 } else if (isodigit(in[1]) &&
298 *out++ = ((in[1] - '0')<<6) |
312 static int check_set(const char **dest, char *src, char *name)
318 pr_err("match-spec:%s val:%s overridden by %s",
326 * Parse words[] as a ddebug query specification, which is a series
327 * of (keyword, value) pairs chosen from these possibilities:
329 * func <function-name>
330 * file <full-pathname>
331 * file <base-filename>
332 * module <module-name>
333 * format <escaped-string-to-find-in-format>
335 * line <first-lineno>-<last-lineno> // where either may be empty
337 * Only 1 of each type is allowed.
338 * Returns 0 on success, <0 on error.
340 static int ddebug_parse_query(char *words[], int nwords,
341 struct ddebug_query *query, const char *modname)
346 /* check we have an even number of words */
349 memset(query, 0, sizeof(*query));
352 /* support $modname.dyndbg=<multiple queries> */
353 query->module = modname;
355 for (i = 0 ; i < nwords ; i += 2) {
356 if (!strcmp(words[i], "func"))
357 rc = check_set(&query->function, words[i+1], "func");
358 else if (!strcmp(words[i], "file"))
359 rc = check_set(&query->filename, words[i+1], "file");
360 else if (!strcmp(words[i], "module"))
361 rc = check_set(&query->module, words[i+1], "module");
362 else if (!strcmp(words[i], "format"))
363 rc = check_set(&query->format, unescape(words[i+1]),
365 else if (!strcmp(words[i], "line")) {
366 char *first = words[i+1];
367 char *last = strchr(first, '-');
368 if (query->first_lineno || query->last_lineno) {
369 pr_err("match-spec:line given 2 times\n");
374 if (parse_lineno(first, &query->first_lineno) < 0)
377 /* range <first>-<last> */
378 if (parse_lineno(last, &query->last_lineno)
379 < query->first_lineno) {
380 pr_err("last-line < 1st-line\n");
384 query->last_lineno = query->first_lineno;
387 pr_err("unknown keyword \"%s\"\n", words[i]);
393 vpr_info_dq(query, "parsed");
398 * Parse `str' as a flags specification, format [-+=][p]+.
399 * Sets up *maskp and *flagsp to be used when changing the
400 * flags fields of matched _ddebug's. Returns 0 on success
403 static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
418 vpr_info("op='%c'\n", op);
420 for ( ; *str ; ++str) {
421 for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
422 if (*str == opt_array[i].opt_char) {
423 flags |= opt_array[i].flag;
430 vpr_info("flags=0x%x\n", flags);
432 /* calculate final *flagsp, *maskp according to mask and op */
447 vpr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp, *maskp);
451 static int ddebug_exec_query(char *query_string, const char *modname)
453 unsigned int flags = 0, mask = 0;
454 struct ddebug_query query;
457 char *words[MAXWORDS];
459 nwords = ddebug_tokenize(query_string, words, MAXWORDS);
462 if (ddebug_parse_query(words, nwords-1, &query, modname))
464 if (ddebug_parse_flags(words[nwords-1], &flags, &mask))
467 /* actually go and implement the change */
468 nfound = ddebug_change(&query, flags, mask);
469 vpr_info_dq((&query), (nfound) ? "applied" : "no-match");
474 /* handle multiple queries in query string, continue on error, return
475 last error or number of matching callsites. Module name is either
476 in param (for boot arg) or perhaps in query string.
478 static int ddebug_exec_queries(char *query, const char *modname)
481 int i, errs = 0, exitcode = 0, rc, nfound = 0;
483 for (i = 0; query; query = split) {
484 split = strpbrk(query, ";\n");
488 query = skip_spaces(query);
489 if (!query || !*query || *query == '#')
492 vpr_info("query %d: \"%s\"\n", i, query);
494 rc = ddebug_exec_query(query, modname);
502 vpr_info("processed %d queries, with %d matches, %d errs\n",
510 #define PREFIX_SIZE 64
512 static int remaining(int wrote)
514 if (PREFIX_SIZE - wrote > 0)
515 return PREFIX_SIZE - wrote;
519 static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf)
526 if (desc->flags & _DPRINTK_FLAGS_INCL_TID) {
528 pos += snprintf(buf + pos, remaining(pos), "<intr> ");
530 pos += snprintf(buf + pos, remaining(pos), "[%d] ",
531 task_pid_vnr(current));
534 if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME)
535 pos += snprintf(buf + pos, remaining(pos), "%s:",
537 if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME)
538 pos += snprintf(buf + pos, remaining(pos), "%s:",
540 if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO)
541 pos += snprintf(buf + pos, remaining(pos), "%d:",
543 if (pos - pos_after_tid)
544 pos += snprintf(buf + pos, remaining(pos), " ");
545 if (pos >= PREFIX_SIZE)
546 buf[PREFIX_SIZE - 1] = '\0';
551 int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
555 struct va_format vaf;
556 char buf[PREFIX_SIZE];
566 res = printk(KERN_DEBUG "%s%pV",
567 dynamic_emit_prefix(descriptor, buf), &vaf);
573 EXPORT_SYMBOL(__dynamic_pr_debug);
575 int __dynamic_dev_dbg(struct _ddebug *descriptor,
576 const struct device *dev, const char *fmt, ...)
578 struct va_format vaf;
591 res = printk(KERN_DEBUG "(NULL device *): %pV", &vaf);
593 char buf[PREFIX_SIZE];
597 dictlen = create_syslog_header(dev, dict, sizeof(dict));
599 res = printk_emit(0, 7, dictlen ? dict : NULL, dictlen,
601 dynamic_emit_prefix(descriptor, buf),
602 dev_driver_string(dev), dev_name(dev), &vaf);
609 EXPORT_SYMBOL(__dynamic_dev_dbg);
613 int __dynamic_netdev_dbg(struct _ddebug *descriptor,
614 const struct net_device *dev, const char *fmt, ...)
616 struct va_format vaf;
628 if (dev && dev->dev.parent) {
629 char buf[PREFIX_SIZE];
633 dictlen = create_syslog_header(dev->dev.parent,
636 res = printk_emit(0, 7, dictlen ? dict : NULL, dictlen,
638 dynamic_emit_prefix(descriptor, buf),
639 dev_driver_string(dev->dev.parent),
640 dev_name(dev->dev.parent),
641 netdev_name(dev), &vaf);
643 res = printk(KERN_DEBUG "%s: %pV", netdev_name(dev), &vaf);
645 res = printk(KERN_DEBUG "(NULL net_device): %pV", &vaf);
652 EXPORT_SYMBOL(__dynamic_netdev_dbg);
656 #define DDEBUG_STRING_SIZE 1024
657 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE];
659 static __init int ddebug_setup_query(char *str)
661 if (strlen(str) >= DDEBUG_STRING_SIZE) {
662 pr_warn("ddebug boot param string too large\n");
665 strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE);
669 __setup("ddebug_query=", ddebug_setup_query);
672 * File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the
673 * command text from userspace, parses and executes it.
675 #define USER_BUF_PAGE 4096
676 static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
677 size_t len, loff_t *offp)
684 if (len > USER_BUF_PAGE - 1) {
685 pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE);
688 tmpbuf = kmalloc(len + 1, GFP_KERNEL);
691 if (copy_from_user(tmpbuf, ubuf, len)) {
696 vpr_info("read %d bytes from userspace\n", (int)len);
698 ret = ddebug_exec_queries(tmpbuf, NULL);
708 * Set the iterator to point to the first _ddebug object
709 * and return a pointer to that first object. Returns
710 * NULL if there are no _ddebugs at all.
712 static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter)
714 if (list_empty(&ddebug_tables)) {
719 iter->table = list_entry(ddebug_tables.next,
720 struct ddebug_table, link);
722 return &iter->table->ddebugs[iter->idx];
726 * Advance the iterator to point to the next _ddebug
727 * object from the one the iterator currently points at,
728 * and returns a pointer to the new _ddebug. Returns
729 * NULL if the iterator has seen all the _ddebugs.
731 static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter)
733 if (iter->table == NULL)
735 if (++iter->idx == iter->table->num_ddebugs) {
736 /* iterate to next table */
738 if (list_is_last(&iter->table->link, &ddebug_tables)) {
742 iter->table = list_entry(iter->table->link.next,
743 struct ddebug_table, link);
745 return &iter->table->ddebugs[iter->idx];
749 * Seq_ops start method. Called at the start of every
750 * read() call from userspace. Takes the ddebug_lock and
751 * seeks the seq_file's iterator to the given position.
753 static void *ddebug_proc_start(struct seq_file *m, loff_t *pos)
755 struct ddebug_iter *iter = m->private;
759 vpr_info("called m=%p *pos=%lld\n", m, (unsigned long long)*pos);
761 mutex_lock(&ddebug_lock);
764 return SEQ_START_TOKEN;
767 dp = ddebug_iter_first(iter);
768 while (dp != NULL && --n > 0)
769 dp = ddebug_iter_next(iter);
774 * Seq_ops next method. Called several times within a read()
775 * call from userspace, with ddebug_lock held. Walks to the
776 * next _ddebug object with a special case for the header line.
778 static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
780 struct ddebug_iter *iter = m->private;
783 vpr_info("called m=%p p=%p *pos=%lld\n",
784 m, p, (unsigned long long)*pos);
786 if (p == SEQ_START_TOKEN)
787 dp = ddebug_iter_first(iter);
789 dp = ddebug_iter_next(iter);
795 * Seq_ops show method. Called several times within a read()
796 * call from userspace, with ddebug_lock held. Formats the
797 * current _ddebug as a single human-readable line, with a
798 * special case for the header line.
800 static int ddebug_proc_show(struct seq_file *m, void *p)
802 struct ddebug_iter *iter = m->private;
803 struct _ddebug *dp = p;
806 vpr_info("called m=%p p=%p\n", m, p);
808 if (p == SEQ_START_TOKEN) {
810 "# filename:lineno [module]function flags format\n");
814 seq_printf(m, "%s:%u [%s]%s =%s \"",
815 trim_prefix(dp->filename), dp->lineno,
816 iter->table->mod_name, dp->function,
817 ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf)));
818 seq_escape(m, dp->format, "\t\r\n\"");
825 * Seq_ops stop method. Called at the end of each read()
826 * call from userspace. Drops ddebug_lock.
828 static void ddebug_proc_stop(struct seq_file *m, void *p)
830 vpr_info("called m=%p p=%p\n", m, p);
831 mutex_unlock(&ddebug_lock);
834 static const struct seq_operations ddebug_proc_seqops = {
835 .start = ddebug_proc_start,
836 .next = ddebug_proc_next,
837 .show = ddebug_proc_show,
838 .stop = ddebug_proc_stop
842 * File_ops->open method for <debugfs>/dynamic_debug/control. Does
843 * the seq_file setup dance, and also creates an iterator to walk the
844 * _ddebugs. Note that we create a seq_file always, even for O_WRONLY
845 * files where it's not needed, as doing so simplifies the ->release
848 static int ddebug_proc_open(struct inode *inode, struct file *file)
850 struct ddebug_iter *iter;
853 vpr_info("called\n");
855 iter = kzalloc(sizeof(*iter), GFP_KERNEL);
859 err = seq_open(file, &ddebug_proc_seqops);
864 ((struct seq_file *) file->private_data)->private = iter;
868 static const struct file_operations ddebug_proc_fops = {
869 .owner = THIS_MODULE,
870 .open = ddebug_proc_open,
873 .release = seq_release_private,
874 .write = ddebug_proc_write
878 * Allocate a new ddebug_table for the given module
879 * and add it to the global list.
881 int ddebug_add_module(struct _ddebug *tab, unsigned int n,
884 struct ddebug_table *dt;
887 dt = kzalloc(sizeof(*dt), GFP_KERNEL);
890 new_name = kstrdup(name, GFP_KERNEL);
891 if (new_name == NULL) {
895 dt->mod_name = new_name;
899 mutex_lock(&ddebug_lock);
900 list_add_tail(&dt->link, &ddebug_tables);
901 mutex_unlock(&ddebug_lock);
903 vpr_info("%u debug prints in module %s\n", n, dt->mod_name);
906 EXPORT_SYMBOL_GPL(ddebug_add_module);
908 /* helper for ddebug_dyndbg_(boot|module)_param_cb */
909 static int ddebug_dyndbg_param_cb(char *param, char *val,
910 const char *modname, int on_err)
914 sep = strchr(param, '.');
916 /* needed only for ddebug_dyndbg_boot_param_cb */
921 if (strcmp(param, "dyndbg"))
922 return on_err; /* determined by caller */
924 ddebug_exec_queries((val ? val : "+p"), modname);
926 return 0; /* query failure shouldnt stop module load */
929 /* handle both dyndbg and $module.dyndbg params at boot */
930 static int ddebug_dyndbg_boot_param_cb(char *param, char *val,
933 vpr_info("%s=\"%s\"\n", param, val);
934 return ddebug_dyndbg_param_cb(param, val, NULL, 0);
938 * modprobe foo finds foo.params in boot-args, strips "foo.", and
939 * passes them to load_module(). This callback gets unknown params,
940 * processes dyndbg params, rejects others.
942 int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module)
944 vpr_info("module: %s %s=\"%s\"\n", module, param, val);
945 return ddebug_dyndbg_param_cb(param, val, module, -ENOENT);
948 static void ddebug_table_free(struct ddebug_table *dt)
950 list_del_init(&dt->link);
956 * Called in response to a module being unloaded. Removes
957 * any ddebug_table's which point at the module.
959 int ddebug_remove_module(const char *mod_name)
961 struct ddebug_table *dt, *nextdt;
964 vpr_info("removing module \"%s\"\n", mod_name);
966 mutex_lock(&ddebug_lock);
967 list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
968 if (!strcmp(dt->mod_name, mod_name)) {
969 ddebug_table_free(dt);
973 mutex_unlock(&ddebug_lock);
976 EXPORT_SYMBOL_GPL(ddebug_remove_module);
978 static void ddebug_remove_all_tables(void)
980 mutex_lock(&ddebug_lock);
981 while (!list_empty(&ddebug_tables)) {
982 struct ddebug_table *dt = list_entry(ddebug_tables.next,
985 ddebug_table_free(dt);
987 mutex_unlock(&ddebug_lock);
990 static __initdata int ddebug_init_success;
992 static int __init dynamic_debug_init_debugfs(void)
994 struct dentry *dir, *file;
996 if (!ddebug_init_success)
999 dir = debugfs_create_dir("dynamic_debug", NULL);
1002 file = debugfs_create_file("control", 0644, dir, NULL,
1005 debugfs_remove(dir);
1011 static int __init dynamic_debug_init(void)
1013 struct _ddebug *iter, *iter_start;
1014 const char *modname = NULL;
1017 int n = 0, entries = 0, modct = 0;
1018 int verbose_bytes = 0;
1020 if (__start___verbose == __stop___verbose) {
1021 pr_warn("_ddebug table is empty in a "
1022 "CONFIG_DYNAMIC_DEBUG build");
1025 iter = __start___verbose;
1026 modname = iter->modname;
1028 for (; iter < __stop___verbose; iter++) {
1030 verbose_bytes += strlen(iter->modname) + strlen(iter->function)
1031 + strlen(iter->filename) + strlen(iter->format);
1033 if (strcmp(modname, iter->modname)) {
1035 ret = ddebug_add_module(iter_start, n, modname);
1039 modname = iter->modname;
1044 ret = ddebug_add_module(iter_start, n, modname);
1048 ddebug_init_success = 1;
1049 vpr_info("%d modules, %d entries and %d bytes in ddebug tables,"
1050 " %d bytes in (readonly) verbose section\n",
1051 modct, entries, (int)( modct * sizeof(struct ddebug_table)),
1052 verbose_bytes + (int)(__stop___verbose - __start___verbose));
1054 /* apply ddebug_query boot param, dont unload tables on err */
1055 if (ddebug_setup_string[0] != '\0') {
1056 pr_warn("ddebug_query param name is deprecated,"
1057 " change it to dyndbg\n");
1058 ret = ddebug_exec_queries(ddebug_setup_string, NULL);
1060 pr_warn("Invalid ddebug boot param %s",
1061 ddebug_setup_string);
1063 pr_info("%d changes by ddebug_query\n", ret);
1065 /* now that ddebug tables are loaded, process all boot args
1066 * again to find and activate queries given in dyndbg params.
1067 * While this has already been done for known boot params, it
1068 * ignored the unknown ones (dyndbg in particular). Reusing
1069 * parse_args avoids ad-hoc parsing. This will also attempt
1070 * to activate queries for not-yet-loaded modules, which is
1071 * slightly noisy if verbose, but harmless.
1073 cmdline = kstrdup(saved_command_line, GFP_KERNEL);
1074 parse_args("dyndbg params", cmdline, NULL,
1075 0, 0, 0, &ddebug_dyndbg_boot_param_cb);
1080 ddebug_remove_all_tables();
1083 /* Allow early initialization for boot messages via boot param */
1084 early_initcall(dynamic_debug_init);
1086 /* Debugfs setup must be done later */
1087 fs_initcall(dynamic_debug_init_debugfs);