diff options
| -rw-r--r-- | Documentation/dynamic-debug-howto.txt | 12 | ||||
| -rw-r--r-- | include/linux/dynamic_debug.h | 8 | ||||
| -rw-r--r-- | lib/dynamic_debug.c | 60 |
3 files changed, 68 insertions, 12 deletions
diff --git a/Documentation/dynamic-debug-howto.txt b/Documentation/dynamic-debug-howto.txt index 58ea64a96165..e6c4b757025b 100644 --- a/Documentation/dynamic-debug-howto.txt +++ b/Documentation/dynamic-debug-howto.txt @@ -205,12 +205,20 @@ of the characters: The flags are: +f + Include the function name in the printed message +l + Include line number in the printed message +m + Include module name in the printed message p Causes a printk() message to be emitted to dmesg +t + Include thread ID in messages not generated from interrupt context -Note the regexp ^[-+=][scp]+$ matches a flags specification. +Note the regexp ^[-+=][flmpt]+$ matches a flags specification. Note also that there is no convenient syntax to remove all -the flags at once, you need to use "-psc". +the flags at once, you need to use "-flmpt". Debug messages during boot process diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h index 1c70028f81f9..0c9653f11c18 100644 --- a/include/linux/dynamic_debug.h +++ b/include/linux/dynamic_debug.h @@ -31,6 +31,10 @@ struct _ddebug { * writes commands to <debugfs>/dynamic_debug/control */ #define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */ +#define _DPRINTK_FLAGS_INCL_MODNAME (1<<1) +#define _DPRINTK_FLAGS_INCL_FUNCNAME (1<<2) +#define _DPRINTK_FLAGS_INCL_LINENO (1<<3) +#define _DPRINTK_FLAGS_INCL_TID (1<<4) #define _DPRINTK_FLAGS_DEFAULT 0 unsigned int flags:8; char enabled; @@ -42,6 +46,8 @@ int ddebug_add_module(struct _ddebug *tab, unsigned int n, #if defined(CONFIG_DYNAMIC_DEBUG) extern int ddebug_remove_module(const char *mod_name); +extern int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) + __attribute__ ((format (printf, 2, 3))); #define dynamic_pr_debug(fmt, ...) do { \ static struct _ddebug descriptor \ @@ -50,7 +56,7 @@ extern int ddebug_remove_module(const char *mod_name); { KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__, \ _DPRINTK_FLAGS_DEFAULT }; \ if (unlikely(descriptor.enabled)) \ - printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \ + __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \ } while (0) diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index b335acb43be2..863c83430964 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) { |