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 #ifdef HAVE_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, flagbuf,
206 mutex_unlock(&ddebug_lock);
208 if (!nfound && verbose)
209 pr_info("no matches for query\n");
215 * Split the buffer `buf' into space-separated words.
216 * Handles simple " and ' quoting, i.e. without nested,
217 * embedded or escaped \". Return the number of words
220 static int ddebug_tokenize(char *buf, char *words[], int maxwords)
227 /* Skip leading whitespace */
228 buf = skip_spaces(buf);
230 break; /* oh, it was trailing whitespace */
232 break; /* token starts comment, skip rest of line */
234 /* find `end' of word, whitespace separated or quoted */
235 if (*buf == '"' || *buf == '\'') {
237 for (end = buf; *end && *end != quote; end++)
240 pr_err("unclosed quote: %s\n", buf);
241 return -EINVAL; /* unclosed quote */
244 for (end = buf; *end && !isspace(*end); end++)
249 /* `buf' is start of word, `end' is one past its end */
250 if (nwords == maxwords) {
251 pr_err("too many words, legal max <=%d\n", maxwords);
252 return -EINVAL; /* ran out of words[] before bytes */
255 *end++ = '\0'; /* terminate the word */
256 words[nwords++] = buf;
262 pr_info("split into words:");
263 for (i = 0; i < nwords; i++)
264 pr_cont(" \"%s\"", words[i]);
272 * Parse a single line number. Note that the empty string ""
273 * is treated as a special case and converted to zero, which
274 * is later treated as a "don't care" value.
276 static inline int parse_lineno(const char *str, unsigned int *val)
283 if (kstrtouint(str, 10, val) < 0) {
284 pr_err("bad line-number: %s\n", str);
290 static int check_set(const char **dest, char *src, char *name)
296 pr_err("match-spec:%s val:%s overridden by %s\n",
304 * Parse words[] as a ddebug query specification, which is a series
305 * of (keyword, value) pairs chosen from these possibilities:
307 * func <function-name>
308 * file <full-pathname>
309 * file <base-filename>
310 * module <module-name>
311 * format <escaped-string-to-find-in-format>
313 * line <first-lineno>-<last-lineno> // where either may be empty
315 * Only 1 of each type is allowed.
316 * Returns 0 on success, <0 on error.
318 static int ddebug_parse_query(char *words[], int nwords,
319 struct ddebug_query *query, const char *modname)
324 /* check we have an even number of words */
325 if (nwords % 2 != 0) {
326 pr_err("expecting pairs of match-spec <value>\n");
329 memset(query, 0, sizeof(*query));
332 /* support $modname.dyndbg=<multiple queries> */
333 query->module = modname;
335 for (i = 0; i < nwords; i += 2) {
336 if (!strcmp(words[i], "func")) {
337 rc = check_set(&query->function, words[i+1], "func");
338 } else if (!strcmp(words[i], "file")) {
339 rc = check_set(&query->filename, words[i+1], "file");
340 } else if (!strcmp(words[i], "module")) {
341 rc = check_set(&query->module, words[i+1], "module");
342 } else if (!strcmp(words[i], "format")) {
343 string_unescape_inplace(words[i+1], UNESCAPE_SPACE |
346 rc = check_set(&query->format, words[i+1], "format");
347 } else if (!strcmp(words[i], "line")) {
348 char *first = words[i+1];
349 char *last = strchr(first, '-');
350 if (query->first_lineno || query->last_lineno) {
351 pr_err("match-spec: line used 2x\n");
356 if (parse_lineno(first, &query->first_lineno) < 0)
359 /* range <first>-<last> */
360 if (parse_lineno(last, &query->last_lineno) < 0)
363 /* special case for last lineno not specified */
364 if (query->last_lineno == 0)
365 query->last_lineno = UINT_MAX;
367 if (query->last_lineno < query->first_lineno) {
368 pr_err("last-line:%d < 1st-line:%d\n",
370 query->first_lineno);
374 query->last_lineno = query->first_lineno;
377 pr_err("unknown keyword \"%s\"\n", words[i]);
383 vpr_info_dq(query, "parsed");
388 * Parse `str' as a flags specification, format [-+=][p]+.
389 * Sets up *maskp and *flagsp to be used when changing the
390 * flags fields of matched _ddebug's. Returns 0 on success
393 static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
406 pr_err("bad flag-op %c, at start of %s\n", *str, str);
409 vpr_info("op='%c'\n", op);
411 for (; *str ; ++str) {
412 for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
413 if (*str == opt_array[i].opt_char) {
414 flags |= opt_array[i].flag;
419 pr_err("unknown flag '%c' in \"%s\"\n", *str, str);
423 vpr_info("flags=0x%x\n", flags);
425 /* calculate final *flagsp, *maskp according to mask and op */
440 vpr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp, *maskp);
444 static int ddebug_exec_query(char *query_string, const char *modname)
446 unsigned int flags = 0, mask = 0;
447 struct ddebug_query query;
450 char *words[MAXWORDS];
452 nwords = ddebug_tokenize(query_string, words, MAXWORDS);
454 pr_err("tokenize failed\n");
457 /* check flags 1st (last arg) so query is pairs of spec,val */
458 if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) {
459 pr_err("flags parse failed\n");
462 if (ddebug_parse_query(words, nwords-1, &query, modname)) {
463 pr_err("query parse failed\n");
466 /* actually go and implement the change */
467 nfound = ddebug_change(&query, flags, mask);
468 vpr_info_dq(&query, nfound ? "applied" : "no-match");
473 /* handle multiple queries in query string, continue on error, return
474 last error or number of matching callsites. Module name is either
475 in param (for boot arg) or perhaps in query string.
477 static int ddebug_exec_queries(char *query, const char *modname)
480 int i, errs = 0, exitcode = 0, rc, nfound = 0;
482 for (i = 0; query; query = split) {
483 split = strpbrk(query, ";\n");
487 query = skip_spaces(query);
488 if (!query || !*query || *query == '#')
491 vpr_info("query %d: \"%s\"\n", i, query);
493 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 void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
554 struct va_format vaf;
555 char buf[PREFIX_SIZE];
565 printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf);
569 EXPORT_SYMBOL(__dynamic_pr_debug);
571 void __dynamic_dev_dbg(struct _ddebug *descriptor,
572 const struct device *dev, const char *fmt, ...)
574 struct va_format vaf;
586 printk(KERN_DEBUG "(NULL device *): %pV", &vaf);
588 char buf[PREFIX_SIZE];
590 dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV",
591 dynamic_emit_prefix(descriptor, buf),
592 dev_driver_string(dev), dev_name(dev),
598 EXPORT_SYMBOL(__dynamic_dev_dbg);
602 void __dynamic_netdev_dbg(struct _ddebug *descriptor,
603 const struct net_device *dev, const char *fmt, ...)
605 struct va_format vaf;
616 if (dev && dev->dev.parent) {
617 char buf[PREFIX_SIZE];
619 dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent,
621 dynamic_emit_prefix(descriptor, buf),
622 dev_driver_string(dev->dev.parent),
623 dev_name(dev->dev.parent),
624 netdev_name(dev), netdev_reg_state(dev),
627 printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev),
628 netdev_reg_state(dev), &vaf);
630 printk(KERN_DEBUG "(NULL net_device): %pV", &vaf);
635 EXPORT_SYMBOL(__dynamic_netdev_dbg);
639 #define DDEBUG_STRING_SIZE 1024
640 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE];
642 static __init int ddebug_setup_query(char *str)
644 if (strlen(str) >= DDEBUG_STRING_SIZE) {
645 pr_warn("ddebug boot param string too large\n");
648 strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE);
652 __setup("ddebug_query=", ddebug_setup_query);
655 * File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the
656 * command text from userspace, parses and executes it.
658 #define USER_BUF_PAGE 4096
659 static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
660 size_t len, loff_t *offp)
667 if (len > USER_BUF_PAGE - 1) {
668 pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE);
671 tmpbuf = memdup_user_nul(ubuf, len);
673 return PTR_ERR(tmpbuf);
674 vpr_info("read %d bytes from userspace\n", (int)len);
676 ret = ddebug_exec_queries(tmpbuf, NULL);
686 * Set the iterator to point to the first _ddebug object
687 * and return a pointer to that first object. Returns
688 * NULL if there are no _ddebugs at all.
690 static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter)
692 if (list_empty(&ddebug_tables)) {
697 iter->table = list_entry(ddebug_tables.next,
698 struct ddebug_table, link);
700 return &iter->table->ddebugs[iter->idx];
704 * Advance the iterator to point to the next _ddebug
705 * object from the one the iterator currently points at,
706 * and returns a pointer to the new _ddebug. Returns
707 * NULL if the iterator has seen all the _ddebugs.
709 static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter)
711 if (iter->table == NULL)
713 if (++iter->idx == iter->table->num_ddebugs) {
714 /* iterate to next table */
716 if (list_is_last(&iter->table->link, &ddebug_tables)) {
720 iter->table = list_entry(iter->table->link.next,
721 struct ddebug_table, link);
723 return &iter->table->ddebugs[iter->idx];
727 * Seq_ops start method. Called at the start of every
728 * read() call from userspace. Takes the ddebug_lock and
729 * seeks the seq_file's iterator to the given position.
731 static void *ddebug_proc_start(struct seq_file *m, loff_t *pos)
733 struct ddebug_iter *iter = m->private;
737 vpr_info("called m=%p *pos=%lld\n", m, (unsigned long long)*pos);
739 mutex_lock(&ddebug_lock);
742 return SEQ_START_TOKEN;
745 dp = ddebug_iter_first(iter);
746 while (dp != NULL && --n > 0)
747 dp = ddebug_iter_next(iter);
752 * Seq_ops next method. Called several times within a read()
753 * call from userspace, with ddebug_lock held. Walks to the
754 * next _ddebug object with a special case for the header line.
756 static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
758 struct ddebug_iter *iter = m->private;
761 vpr_info("called m=%p p=%p *pos=%lld\n",
762 m, p, (unsigned long long)*pos);
764 if (p == SEQ_START_TOKEN)
765 dp = ddebug_iter_first(iter);
767 dp = ddebug_iter_next(iter);
773 * Seq_ops show method. Called several times within a read()
774 * call from userspace, with ddebug_lock held. Formats the
775 * current _ddebug as a single human-readable line, with a
776 * special case for the header line.
778 static int ddebug_proc_show(struct seq_file *m, void *p)
780 struct ddebug_iter *iter = m->private;
781 struct _ddebug *dp = p;
784 vpr_info("called m=%p p=%p\n", m, p);
786 if (p == SEQ_START_TOKEN) {
788 "# filename:lineno [module]function flags format\n");
792 seq_printf(m, "%s:%u [%s]%s =%s \"",
793 trim_prefix(dp->filename), dp->lineno,
794 iter->table->mod_name, dp->function,
795 ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf)));
796 seq_escape(m, dp->format, "\t\r\n\"");
803 * Seq_ops stop method. Called at the end of each read()
804 * call from userspace. Drops ddebug_lock.
806 static void ddebug_proc_stop(struct seq_file *m, void *p)
808 vpr_info("called m=%p p=%p\n", m, p);
809 mutex_unlock(&ddebug_lock);
812 static const struct seq_operations ddebug_proc_seqops = {
813 .start = ddebug_proc_start,
814 .next = ddebug_proc_next,
815 .show = ddebug_proc_show,
816 .stop = ddebug_proc_stop
820 * File_ops->open method for <debugfs>/dynamic_debug/control. Does
821 * the seq_file setup dance, and also creates an iterator to walk the
822 * _ddebugs. Note that we create a seq_file always, even for O_WRONLY
823 * files where it's not needed, as doing so simplifies the ->release
826 static int ddebug_proc_open(struct inode *inode, struct file *file)
828 vpr_info("called\n");
829 return seq_open_private(file, &ddebug_proc_seqops,
830 sizeof(struct ddebug_iter));
833 static const struct file_operations ddebug_proc_fops = {
834 .owner = THIS_MODULE,
835 .open = ddebug_proc_open,
838 .release = seq_release_private,
839 .write = ddebug_proc_write
843 * Allocate a new ddebug_table for the given module
844 * and add it to the global list.
846 int ddebug_add_module(struct _ddebug *tab, unsigned int n,
849 struct ddebug_table *dt;
850 const char *new_name;
852 dt = kzalloc(sizeof(*dt), GFP_KERNEL);
855 new_name = kstrdup_const(name, GFP_KERNEL);
856 if (new_name == NULL) {
860 dt->mod_name = new_name;
864 mutex_lock(&ddebug_lock);
865 list_add_tail(&dt->link, &ddebug_tables);
866 mutex_unlock(&ddebug_lock);
868 vpr_info("%u debug prints in module %s\n", n, dt->mod_name);
871 EXPORT_SYMBOL_GPL(ddebug_add_module);
873 /* helper for ddebug_dyndbg_(boot|module)_param_cb */
874 static int ddebug_dyndbg_param_cb(char *param, char *val,
875 const char *modname, int on_err)
879 sep = strchr(param, '.');
881 /* needed only for ddebug_dyndbg_boot_param_cb */
886 if (strcmp(param, "dyndbg"))
887 return on_err; /* determined by caller */
889 ddebug_exec_queries((val ? val : "+p"), modname);
891 return 0; /* query failure shouldnt stop module load */
894 /* handle both dyndbg and $module.dyndbg params at boot */
895 static int ddebug_dyndbg_boot_param_cb(char *param, char *val,
896 const char *unused, void *arg)
898 vpr_info("%s=\"%s\"\n", param, val);
899 return ddebug_dyndbg_param_cb(param, val, NULL, 0);
903 * modprobe foo finds foo.params in boot-args, strips "foo.", and
904 * passes them to load_module(). This callback gets unknown params,
905 * processes dyndbg params, rejects others.
907 int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module)
909 vpr_info("module: %s %s=\"%s\"\n", module, param, val);
910 return ddebug_dyndbg_param_cb(param, val, module, -ENOENT);
913 static void ddebug_table_free(struct ddebug_table *dt)
915 list_del_init(&dt->link);
916 kfree_const(dt->mod_name);
921 * Called in response to a module being unloaded. Removes
922 * any ddebug_table's which point at the module.
924 int ddebug_remove_module(const char *mod_name)
926 struct ddebug_table *dt, *nextdt;
929 vpr_info("removing module \"%s\"\n", mod_name);
931 mutex_lock(&ddebug_lock);
932 list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
933 if (!strcmp(dt->mod_name, mod_name)) {
934 ddebug_table_free(dt);
938 mutex_unlock(&ddebug_lock);
941 EXPORT_SYMBOL_GPL(ddebug_remove_module);
943 static void ddebug_remove_all_tables(void)
945 mutex_lock(&ddebug_lock);
946 while (!list_empty(&ddebug_tables)) {
947 struct ddebug_table *dt = list_entry(ddebug_tables.next,
950 ddebug_table_free(dt);
952 mutex_unlock(&ddebug_lock);
955 static __initdata int ddebug_init_success;
957 static int __init dynamic_debug_init_debugfs(void)
959 struct dentry *dir, *file;
961 if (!ddebug_init_success)
964 dir = debugfs_create_dir("dynamic_debug", NULL);
967 file = debugfs_create_file("control", 0644, dir, NULL,
976 static int __init dynamic_debug_init(void)
978 struct _ddebug *iter, *iter_start;
979 const char *modname = NULL;
982 int n = 0, entries = 0, modct = 0;
983 int verbose_bytes = 0;
985 if (__start___verbose == __stop___verbose) {
986 pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n");
989 iter = __start___verbose;
990 modname = iter->modname;
992 for (; iter < __stop___verbose; iter++) {
994 verbose_bytes += strlen(iter->modname) + strlen(iter->function)
995 + strlen(iter->filename) + strlen(iter->format);
997 if (strcmp(modname, iter->modname)) {
999 ret = ddebug_add_module(iter_start, n, modname);
1003 modname = iter->modname;
1008 ret = ddebug_add_module(iter_start, n, modname);
1012 ddebug_init_success = 1;
1013 vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in (readonly) verbose section\n",
1014 modct, entries, (int)(modct * sizeof(struct ddebug_table)),
1015 verbose_bytes + (int)(__stop___verbose - __start___verbose));
1017 /* apply ddebug_query boot param, dont unload tables on err */
1018 if (ddebug_setup_string[0] != '\0') {
1019 pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n");
1020 ret = ddebug_exec_queries(ddebug_setup_string, NULL);
1022 pr_warn("Invalid ddebug boot param %s\n",
1023 ddebug_setup_string);
1025 pr_info("%d changes by ddebug_query\n", ret);
1027 /* now that ddebug tables are loaded, process all boot args
1028 * again to find and activate queries given in dyndbg params.
1029 * While this has already been done for known boot params, it
1030 * ignored the unknown ones (dyndbg in particular). Reusing
1031 * parse_args avoids ad-hoc parsing. This will also attempt
1032 * to activate queries for not-yet-loaded modules, which is
1033 * slightly noisy if verbose, but harmless.
1035 cmdline = kstrdup(saved_command_line, GFP_KERNEL);
1036 parse_args("dyndbg params", cmdline, NULL,
1037 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb);
1042 ddebug_remove_all_tables();
1045 /* Allow early initialization for boot messages via boot param */
1046 early_initcall(dynamic_debug_init);
1048 /* Debugfs setup must be done later */
1049 fs_initcall(dynamic_debug_init_debugfs);