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dynamic_debug: add wildcard support to filter files/functions/modules 

Add wildcard '*'(matches zero or more characters) and '?' (matches one
character) support when qurying debug flags.

Now we can open debug messages using keywords. eg:
1. open debug logs in all usb drivers
    echo "file drivers/usb/* +p" > <debugfs>/dynamic_debug/control
2.  open debug logs for usb xhci code
    echo "file *xhci* +p" > <debugfs>/dynamic_debug/control

Signed-off-by: Du, Changbin <changbin.du@gmail.com>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Du, Changbin 2014-01-23 15:54:14 -08:00 committed by Linus Torvalds
parent a3d2cca43c
commit 578b1e0701
1 changed files with 10 additions and 5 deletions
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15
lib/dynamic_debug.c
View File

@ -8,6 +8,7 @@
* By Greg Banks <gnb@melbourne.sgi.com>
* Copyright (c) 2008 Silicon Graphics Inc. All Rights Reserved.
* Copyright (C) 2011 Bart Van Assche. All Rights Reserved.
* Copyright (C) 2013 Du, Changbin <changbin.du@gmail.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
@ -24,6 +25,7 @@
#include <linux/sysctl.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/parser.h>
#include <linux/string_helpers.h>
#include <linux/uaccess.h>
#include <linux/dynamic_debug.h>
@ -147,7 +149,8 @@ static int ddebug_change(const struct ddebug_query *query,
list_for_each_entry(dt, &ddebug_tables, link) {
/* match against the module name */
if (query->module && strcmp(query->module, dt->mod_name))
if (query->module &&
!match_wildcard(query->module, dt->mod_name))
continue;
for (i = 0; i < dt->num_ddebugs; i++) {
@ -155,14 +158,16 @@ static int ddebug_change(const struct ddebug_query *query,
/* match against the source filename */
if (query->filename &&
strcmp(query->filename, dp->filename) &&
strcmp(query->filename, kbasename(dp->filename)) &&
strcmp(query->filename, trim_prefix(dp->filename)))
!match_wildcard(query->filename, dp->filename) &&
!match_wildcard(query->filename,
kbasename(dp->filename)) &&
!match_wildcard(query->filename,
trim_prefix(dp->filename)))
continue;
/* match against the function */
if (query->function &&
strcmp(query->function, dp->function))
!match_wildcard(query->function, dp->function))
continue;
/* match against the format */