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 /* format a string into buf[] which describes the _ddebug's flags */
89 static char *ddebug_describe_flags(struct _ddebug *dp, char *buf,
96 for (i = 0; i < ARRAY_SIZE(opt_array); ++i)
97 if (dp->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;
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 dp->flags = newflags;
192 vpr_info("changed %s:%d [%s]%s =%s\n",
193 trim_prefix(dp->filename), dp->lineno,
194 dt->mod_name, dp->function,
195 ddebug_describe_flags(dp, flagbuf,
199 mutex_unlock(&ddebug_lock);
201 if (!nfound && verbose)
202 pr_info("no matches for query\n");
208 * Split the buffer `buf' into space-separated words.
209 * Handles simple " and ' quoting, i.e. without nested,
210 * embedded or escaped \". Return the number of words
213 static int ddebug_tokenize(char *buf, char *words[], int maxwords)
220 /* Skip leading whitespace */
221 buf = skip_spaces(buf);
223 break; /* oh, it was trailing whitespace */
225 break; /* token starts comment, skip rest of line */
227 /* find `end' of word, whitespace separated or quoted */
228 if (*buf == '"' || *buf == '\'') {
230 for (end = buf; *end && *end != quote; end++)
233 pr_err("unclosed quote: %s\n", buf);
234 return -EINVAL; /* unclosed quote */
237 for (end = buf; *end && !isspace(*end); end++)
242 /* `buf' is start of word, `end' is one past its end */
243 if (nwords == maxwords) {
244 pr_err("too many words, legal max <=%d\n", maxwords);
245 return -EINVAL; /* ran out of words[] before bytes */
248 *end++ = '\0'; /* terminate the word */
249 words[nwords++] = buf;
255 pr_info("split into words:");
256 for (i = 0; i < nwords; i++)
257 pr_cont(" \"%s\"", words[i]);
265 * Parse a single line number. Note that the empty string ""
266 * is treated as a special case and converted to zero, which
267 * is later treated as a "don't care" value.
269 static inline int parse_lineno(const char *str, unsigned int *val)
276 if (kstrtouint(str, 10, val) < 0) {
277 pr_err("bad line-number: %s\n", str);
283 static int check_set(const char **dest, char *src, char *name)
289 pr_err("match-spec:%s val:%s overridden by %s\n",
297 * Parse words[] as a ddebug query specification, which is a series
298 * of (keyword, value) pairs chosen from these possibilities:
300 * func <function-name>
301 * file <full-pathname>
302 * file <base-filename>
303 * module <module-name>
304 * format <escaped-string-to-find-in-format>
306 * line <first-lineno>-<last-lineno> // where either may be empty
308 * Only 1 of each type is allowed.
309 * Returns 0 on success, <0 on error.
311 static int ddebug_parse_query(char *words[], int nwords,
312 struct ddebug_query *query, const char *modname)
317 /* check we have an even number of words */
318 if (nwords % 2 != 0) {
319 pr_err("expecting pairs of match-spec <value>\n");
322 memset(query, 0, sizeof(*query));
325 /* support $modname.dyndbg=<multiple queries> */
326 query->module = modname;
328 for (i = 0; i < nwords; i += 2) {
329 if (!strcmp(words[i], "func")) {
330 rc = check_set(&query->function, words[i+1], "func");
331 } else if (!strcmp(words[i], "file")) {
332 rc = check_set(&query->filename, words[i+1], "file");
333 } else if (!strcmp(words[i], "module")) {
334 rc = check_set(&query->module, words[i+1], "module");
335 } else if (!strcmp(words[i], "format")) {
336 string_unescape_inplace(words[i+1], UNESCAPE_SPACE |
339 rc = check_set(&query->format, words[i+1], "format");
340 } else if (!strcmp(words[i], "line")) {
341 char *first = words[i+1];
342 char *last = strchr(first, '-');
343 if (query->first_lineno || query->last_lineno) {
344 pr_err("match-spec: line used 2x\n");
349 if (parse_lineno(first, &query->first_lineno) < 0)
352 /* range <first>-<last> */
353 if (parse_lineno(last, &query->last_lineno) < 0)
356 if (query->last_lineno < query->first_lineno) {
357 pr_err("last-line:%d < 1st-line:%d\n",
359 query->first_lineno);
363 query->last_lineno = query->first_lineno;
366 pr_err("unknown keyword \"%s\"\n", words[i]);
372 vpr_info_dq(query, "parsed");
377 * Parse `str' as a flags specification, format [-+=][p]+.
378 * Sets up *maskp and *flagsp to be used when changing the
379 * flags fields of matched _ddebug's. Returns 0 on success
382 static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
395 pr_err("bad flag-op %c, at start of %s\n", *str, str);
398 vpr_info("op='%c'\n", op);
400 for (; *str ; ++str) {
401 for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
402 if (*str == opt_array[i].opt_char) {
403 flags |= opt_array[i].flag;
408 pr_err("unknown flag '%c' in \"%s\"\n", *str, str);
412 vpr_info("flags=0x%x\n", flags);
414 /* calculate final *flagsp, *maskp according to mask and op */
429 vpr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp, *maskp);
433 static int ddebug_exec_query(char *query_string, const char *modname)
435 unsigned int flags = 0, mask = 0;
436 struct ddebug_query query;
439 char *words[MAXWORDS];
441 nwords = ddebug_tokenize(query_string, words, MAXWORDS);
443 pr_err("tokenize failed\n");
446 /* check flags 1st (last arg) so query is pairs of spec,val */
447 if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) {
448 pr_err("flags parse failed\n");
451 if (ddebug_parse_query(words, nwords-1, &query, modname)) {
452 pr_err("query parse failed\n");
455 /* actually go and implement the change */
456 nfound = ddebug_change(&query, flags, mask);
457 vpr_info_dq(&query, nfound ? "applied" : "no-match");
462 /* handle multiple queries in query string, continue on error, return
463 last error or number of matching callsites. Module name is either
464 in param (for boot arg) or perhaps in query string.
466 static int ddebug_exec_queries(char *query, const char *modname)
469 int i, errs = 0, exitcode = 0, rc, nfound = 0;
471 for (i = 0; query; query = split) {
472 split = strpbrk(query, ";\n");
476 query = skip_spaces(query);
477 if (!query || !*query || *query == '#')
480 vpr_info("query %d: \"%s\"\n", i, query);
482 rc = ddebug_exec_query(query, modname);
491 vpr_info("processed %d queries, with %d matches, %d errs\n",
499 #define PREFIX_SIZE 64
501 static int remaining(int wrote)
503 if (PREFIX_SIZE - wrote > 0)
504 return PREFIX_SIZE - wrote;
508 static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf)
515 if (desc->flags & _DPRINTK_FLAGS_INCL_TID) {
517 pos += snprintf(buf + pos, remaining(pos), "<intr> ");
519 pos += snprintf(buf + pos, remaining(pos), "[%d] ",
520 task_pid_vnr(current));
523 if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME)
524 pos += snprintf(buf + pos, remaining(pos), "%s:",
526 if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME)
527 pos += snprintf(buf + pos, remaining(pos), "%s:",
529 if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO)
530 pos += snprintf(buf + pos, remaining(pos), "%d:",
532 if (pos - pos_after_tid)
533 pos += snprintf(buf + pos, remaining(pos), " ");
534 if (pos >= PREFIX_SIZE)
535 buf[PREFIX_SIZE - 1] = '\0';
540 void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
543 struct va_format vaf;
544 char buf[PREFIX_SIZE];
554 printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf);
558 EXPORT_SYMBOL(__dynamic_pr_debug);
560 void __dynamic_dev_dbg(struct _ddebug *descriptor,
561 const struct device *dev, const char *fmt, ...)
563 struct va_format vaf;
575 printk(KERN_DEBUG "(NULL device *): %pV", &vaf);
577 char buf[PREFIX_SIZE];
579 dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV",
580 dynamic_emit_prefix(descriptor, buf),
581 dev_driver_string(dev), dev_name(dev),
587 EXPORT_SYMBOL(__dynamic_dev_dbg);
591 void __dynamic_netdev_dbg(struct _ddebug *descriptor,
592 const struct net_device *dev, const char *fmt, ...)
594 struct va_format vaf;
605 if (dev && dev->dev.parent) {
606 char buf[PREFIX_SIZE];
608 dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent,
610 dynamic_emit_prefix(descriptor, buf),
611 dev_driver_string(dev->dev.parent),
612 dev_name(dev->dev.parent),
613 netdev_name(dev), netdev_reg_state(dev),
616 printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev),
617 netdev_reg_state(dev), &vaf);
619 printk(KERN_DEBUG "(NULL net_device): %pV", &vaf);
624 EXPORT_SYMBOL(__dynamic_netdev_dbg);
628 #define DDEBUG_STRING_SIZE 1024
629 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE];
631 static __init int ddebug_setup_query(char *str)
633 if (strlen(str) >= DDEBUG_STRING_SIZE) {
634 pr_warn("ddebug boot param string too large\n");
637 strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE);
641 __setup("ddebug_query=", ddebug_setup_query);
644 * File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the
645 * command text from userspace, parses and executes it.
647 #define USER_BUF_PAGE 4096
648 static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
649 size_t len, loff_t *offp)
656 if (len > USER_BUF_PAGE - 1) {
657 pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE);
660 tmpbuf = kmalloc(len + 1, GFP_KERNEL);
663 if (copy_from_user(tmpbuf, ubuf, len)) {
668 vpr_info("read %d bytes from userspace\n", (int)len);
670 ret = ddebug_exec_queries(tmpbuf, NULL);
680 * Set the iterator to point to the first _ddebug object
681 * and return a pointer to that first object. Returns
682 * NULL if there are no _ddebugs at all.
684 static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter)
686 if (list_empty(&ddebug_tables)) {
691 iter->table = list_entry(ddebug_tables.next,
692 struct ddebug_table, link);
694 return &iter->table->ddebugs[iter->idx];
698 * Advance the iterator to point to the next _ddebug
699 * object from the one the iterator currently points at,
700 * and returns a pointer to the new _ddebug. Returns
701 * NULL if the iterator has seen all the _ddebugs.
703 static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter)
705 if (iter->table == NULL)
707 if (++iter->idx == iter->table->num_ddebugs) {
708 /* iterate to next table */
710 if (list_is_last(&iter->table->link, &ddebug_tables)) {
714 iter->table = list_entry(iter->table->link.next,
715 struct ddebug_table, link);
717 return &iter->table->ddebugs[iter->idx];
721 * Seq_ops start method. Called at the start of every
722 * read() call from userspace. Takes the ddebug_lock and
723 * seeks the seq_file's iterator to the given position.
725 static void *ddebug_proc_start(struct seq_file *m, loff_t *pos)
727 struct ddebug_iter *iter = m->private;
731 vpr_info("called m=%p *pos=%lld\n", m, (unsigned long long)*pos);
733 mutex_lock(&ddebug_lock);
736 return SEQ_START_TOKEN;
739 dp = ddebug_iter_first(iter);
740 while (dp != NULL && --n > 0)
741 dp = ddebug_iter_next(iter);
746 * Seq_ops next method. Called several times within a read()
747 * call from userspace, with ddebug_lock held. Walks to the
748 * next _ddebug object with a special case for the header line.
750 static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
752 struct ddebug_iter *iter = m->private;
755 vpr_info("called m=%p p=%p *pos=%lld\n",
756 m, p, (unsigned long long)*pos);
758 if (p == SEQ_START_TOKEN)
759 dp = ddebug_iter_first(iter);
761 dp = ddebug_iter_next(iter);
767 * Seq_ops show method. Called several times within a read()
768 * call from userspace, with ddebug_lock held. Formats the
769 * current _ddebug as a single human-readable line, with a
770 * special case for the header line.
772 static int ddebug_proc_show(struct seq_file *m, void *p)
774 struct ddebug_iter *iter = m->private;
775 struct _ddebug *dp = p;
778 vpr_info("called m=%p p=%p\n", m, p);
780 if (p == SEQ_START_TOKEN) {
782 "# filename:lineno [module]function flags format\n");
786 seq_printf(m, "%s:%u [%s]%s =%s \"",
787 trim_prefix(dp->filename), dp->lineno,
788 iter->table->mod_name, dp->function,
789 ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf)));
790 seq_escape(m, dp->format, "\t\r\n\"");
797 * Seq_ops stop method. Called at the end of each read()
798 * call from userspace. Drops ddebug_lock.
800 static void ddebug_proc_stop(struct seq_file *m, void *p)
802 vpr_info("called m=%p p=%p\n", m, p);
803 mutex_unlock(&ddebug_lock);
806 static const struct seq_operations ddebug_proc_seqops = {
807 .start = ddebug_proc_start,
808 .next = ddebug_proc_next,
809 .show = ddebug_proc_show,
810 .stop = ddebug_proc_stop
814 * File_ops->open method for <debugfs>/dynamic_debug/control. Does
815 * the seq_file setup dance, and also creates an iterator to walk the
816 * _ddebugs. Note that we create a seq_file always, even for O_WRONLY
817 * files where it's not needed, as doing so simplifies the ->release
820 static int ddebug_proc_open(struct inode *inode, struct file *file)
822 vpr_info("called\n");
823 return seq_open_private(file, &ddebug_proc_seqops,
824 sizeof(struct ddebug_iter));
827 static const struct file_operations ddebug_proc_fops = {
828 .owner = THIS_MODULE,
829 .open = ddebug_proc_open,
832 .release = seq_release_private,
833 .write = ddebug_proc_write
837 * Allocate a new ddebug_table for the given module
838 * and add it to the global list.
840 int ddebug_add_module(struct _ddebug *tab, unsigned int n,
843 struct ddebug_table *dt;
846 dt = kzalloc(sizeof(*dt), GFP_KERNEL);
849 new_name = kstrdup(name, GFP_KERNEL);
850 if (new_name == NULL) {
854 dt->mod_name = new_name;
858 mutex_lock(&ddebug_lock);
859 list_add_tail(&dt->link, &ddebug_tables);
860 mutex_unlock(&ddebug_lock);
862 vpr_info("%u debug prints in module %s\n", n, dt->mod_name);
865 EXPORT_SYMBOL_GPL(ddebug_add_module);
867 /* helper for ddebug_dyndbg_(boot|module)_param_cb */
868 static int ddebug_dyndbg_param_cb(char *param, char *val,
869 const char *modname, int on_err)
873 sep = strchr(param, '.');
875 /* needed only for ddebug_dyndbg_boot_param_cb */
880 if (strcmp(param, "dyndbg"))
881 return on_err; /* determined by caller */
883 ddebug_exec_queries((val ? val : "+p"), modname);
885 return 0; /* query failure shouldnt stop module load */
888 /* handle both dyndbg and $module.dyndbg params at boot */
889 static int ddebug_dyndbg_boot_param_cb(char *param, char *val,
890 const char *unused, void *arg)
892 vpr_info("%s=\"%s\"\n", param, val);
893 return ddebug_dyndbg_param_cb(param, val, NULL, 0);
897 * modprobe foo finds foo.params in boot-args, strips "foo.", and
898 * passes them to load_module(). This callback gets unknown params,
899 * processes dyndbg params, rejects others.
901 int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module)
903 vpr_info("module: %s %s=\"%s\"\n", module, param, val);
904 return ddebug_dyndbg_param_cb(param, val, module, -ENOENT);
907 static void ddebug_table_free(struct ddebug_table *dt)
909 list_del_init(&dt->link);
915 * Called in response to a module being unloaded. Removes
916 * any ddebug_table's which point at the module.
918 int ddebug_remove_module(const char *mod_name)
920 struct ddebug_table *dt, *nextdt;
923 vpr_info("removing module \"%s\"\n", mod_name);
925 mutex_lock(&ddebug_lock);
926 list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
927 if (!strcmp(dt->mod_name, mod_name)) {
928 ddebug_table_free(dt);
932 mutex_unlock(&ddebug_lock);
935 EXPORT_SYMBOL_GPL(ddebug_remove_module);
937 static void ddebug_remove_all_tables(void)
939 mutex_lock(&ddebug_lock);
940 while (!list_empty(&ddebug_tables)) {
941 struct ddebug_table *dt = list_entry(ddebug_tables.next,
944 ddebug_table_free(dt);
946 mutex_unlock(&ddebug_lock);
949 static __initdata int ddebug_init_success;
951 static int __init dynamic_debug_init_debugfs(void)
953 struct dentry *dir, *file;
955 if (!ddebug_init_success)
958 dir = debugfs_create_dir("dynamic_debug", NULL);
961 file = debugfs_create_file("control", 0644, dir, NULL,
970 static int __init dynamic_debug_init(void)
972 struct _ddebug *iter, *iter_start;
973 const char *modname = NULL;
976 int n = 0, entries = 0, modct = 0;
977 int verbose_bytes = 0;
979 if (__start___verbose == __stop___verbose) {
980 pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n");
983 iter = __start___verbose;
984 modname = iter->modname;
986 for (; iter < __stop___verbose; iter++) {
988 verbose_bytes += strlen(iter->modname) + strlen(iter->function)
989 + strlen(iter->filename) + strlen(iter->format);
991 if (strcmp(modname, iter->modname)) {
993 ret = ddebug_add_module(iter_start, n, modname);
997 modname = iter->modname;
1002 ret = ddebug_add_module(iter_start, n, modname);
1006 ddebug_init_success = 1;
1007 vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in (readonly) verbose section\n",
1008 modct, entries, (int)(modct * sizeof(struct ddebug_table)),
1009 verbose_bytes + (int)(__stop___verbose - __start___verbose));
1011 /* apply ddebug_query boot param, dont unload tables on err */
1012 if (ddebug_setup_string[0] != '\0') {
1013 pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n");
1014 ret = ddebug_exec_queries(ddebug_setup_string, NULL);
1016 pr_warn("Invalid ddebug boot param %s\n",
1017 ddebug_setup_string);
1019 pr_info("%d changes by ddebug_query\n", ret);
1021 /* now that ddebug tables are loaded, process all boot args
1022 * again to find and activate queries given in dyndbg params.
1023 * While this has already been done for known boot params, it
1024 * ignored the unknown ones (dyndbg in particular). Reusing
1025 * parse_args avoids ad-hoc parsing. This will also attempt
1026 * to activate queries for not-yet-loaded modules, which is
1027 * slightly noisy if verbose, but harmless.
1029 cmdline = kstrdup(saved_command_line, GFP_KERNEL);
1030 parse_args("dyndbg params", cmdline, NULL,
1031 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb);
1036 ddebug_remove_all_tables();
1039 /* Allow early initialization for boot messages via boot param */
1040 early_initcall(dynamic_debug_init);
1042 /* Debugfs setup must be done later */
1043 fs_initcall(dynamic_debug_init_debugfs);