aboutsummaryrefslogtreecommitdiffstats
path: root/lib/dynamic_debug.c
diff options
context:
space:
mode:
authorBart Van Assche <bvanassche@acm.org>2011-01-23 16:17:24 (GMT)
committerGreg Kroah-Hartman <gregkh@suse.de>2011-02-03 23:39:16 (GMT)
commit8ba6ebf583f12da32036fc0f003ab4043e54692e (patch)
tree8fdd980d30fea50722b28fb5d782236174b2d188 /lib/dynamic_debug.c
parent9b99b7f84ea520d2ecaf816bde247a1ad07e454e (diff)
Dynamic debug: Add more flags
Add flags that allow the user to specify via debugfs whether or not the module name, function name, line number and/or thread ID have to be included in the printed message. Signed-off-by: Bart Van Assche <bvanassche@acm.org> Cc: Greg Banks <gnb@fmeh.org> Cc: Konrad Rzeszutek Wilk <konrad@darnok.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'lib/dynamic_debug.c')
-rw-r--r--lib/dynamic_debug.c60
1 files changed, 51 insertions, 9 deletions
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index b335acb..863c834 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -7,6 +7,7 @@
* Copyright (C) 2008 Jason Baron <jbaron@redhat.com>
* 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.
*/
#include <linux/kernel.h>
@@ -27,6 +28,7 @@
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/jump_label.h>
+#include <linux/hardirq.h>
extern struct _ddebug __start___verbose[];
extern struct _ddebug __stop___verbose[];
@@ -63,15 +65,25 @@ static inline const char *basename(const char *path)
return tail ? tail+1 : path;
}
+static struct { unsigned flag:8; char opt_char; } opt_array[] = {
+ { _DPRINTK_FLAGS_PRINT, 'p' },
+ { _DPRINTK_FLAGS_INCL_MODNAME, 'm' },
+ { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' },
+ { _DPRINTK_FLAGS_INCL_LINENO, 'l' },
+ { _DPRINTK_FLAGS_INCL_TID, 't' },
+};
+
/* format a string into buf[] which describes the _ddebug's flags */
static char *ddebug_describe_flags(struct _ddebug *dp, char *buf,
size_t maxlen)
{
char *p = buf;
+ int i;
BUG_ON(maxlen < 4);
- if (dp->flags & _DPRINTK_FLAGS_PRINT)
- *p++ = 'p';
+ for (i = 0; i < ARRAY_SIZE(opt_array); ++i)
+ if (dp->flags & opt_array[i].flag)
+ *p++ = opt_array[i].opt_char;
if (p == buf)
*p++ = '-';
*p = '\0';
@@ -343,7 +355,7 @@ static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
unsigned int *maskp)
{
unsigned flags = 0;
- int op = '=';
+ int op = '=', i;
switch (*str) {
case '+':
@@ -358,13 +370,14 @@ static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
printk(KERN_INFO "%s: op='%c'\n", __func__, op);
for ( ; *str ; ++str) {
- switch (*str) {
- case 'p':
- flags |= _DPRINTK_FLAGS_PRINT;
- break;
- default:
- return -EINVAL;
+ for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
+ if (*str == opt_array[i].opt_char) {
+ flags |= opt_array[i].flag;
+ break;
+ }
}
+ if (i < 0)
+ return -EINVAL;
}
if (flags == 0)
return -EINVAL;
@@ -413,6 +426,35 @@ static int ddebug_exec_query(char *query_string)
return 0;
}
+int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
+{
+ va_list args;
+ int res;
+
+ BUG_ON(!descriptor);
+ BUG_ON(!fmt);
+
+ va_start(args, fmt);
+ res = printk(KERN_DEBUG);
+ if (descriptor->flags & _DPRINTK_FLAGS_INCL_TID) {
+ if (in_interrupt())
+ res += printk(KERN_CONT "<intr> ");
+ else
+ res += printk(KERN_CONT "[%d] ", task_pid_vnr(current));
+ }
+ if (descriptor->flags & _DPRINTK_FLAGS_INCL_MODNAME)
+ res += printk(KERN_CONT "%s:", descriptor->modname);
+ if (descriptor->flags & _DPRINTK_FLAGS_INCL_FUNCNAME)
+ res += printk(KERN_CONT "%s:", descriptor->function);
+ if (descriptor->flags & _DPRINTK_FLAGS_INCL_LINENO)
+ res += printk(KERN_CONT "%d ", descriptor->lineno);
+ res += vprintk(fmt, args);
+ va_end(args);
+
+ return res;
+}
+EXPORT_SYMBOL(__dynamic_pr_debug);
+
static __initdata char ddebug_setup_string[1024];
static __init int ddebug_setup_query(char *str)
{

Privacy Policy