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jump label: Convert dynamic debug to use jump labels

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Convert the 'dynamic debug' infrastructure to use jump labels.

Signed-off-by: Jason Baron <jbaron@redhat.com>
LKML-Reference: <b77627358cea3e27d7be4386f45f66219afb8452.1284733808.git.jbaron@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jason Baron 2010-09-17 11:09:17 -04:00 • committed by Steven Rostedt
parent 8f7b50c514
commit 52159d98be
5 changed files with 26 additions and 132 deletions
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39
include/linux/dynamic_debug.h
View file

@ -1,6 +1,8 @@
#ifndef _DYNAMIC_DEBUG_H
#define _DYNAMIC_DEBUG_H
#include <linux/jump_label.h>
/* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which
* bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
* use independent hash functions, to reduce the chance of false positives.
@ -22,8 +24,6 @@ struct _ddebug {
const char *function;
const char *filename;
const char *format;
char primary_hash;
char secondary_hash;
unsigned int lineno:24;
/*
* The flags field controls the behaviour at the callsite.
@ -33,6 +33,7 @@ struct _ddebug {
#define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */
#define _DPRINTK_FLAGS_DEFAULT 0
unsigned int flags:8;
char enabled;
} __attribute__((aligned(8)));
@ -42,33 +43,35 @@ int ddebug_add_module(struct _ddebug *tab, unsigned int n,
#if defined(CONFIG_DYNAMIC_DEBUG)
extern int ddebug_remove_module(const char *mod_name);
#define __dynamic_dbg_enabled(dd) ({ \
int __ret = 0; \
if (unlikely((dynamic_debug_enabled & (1LL << DEBUG_HASH)) && \
(dynamic_debug_enabled2 & (1LL << DEBUG_HASH2)))) \
if (unlikely(dd.flags)) \
__ret = 1; \
__ret; })
#define dynamic_pr_debug(fmt, ...) do { \
__label__ do_printk; \
__label__ out; \
static struct _ddebug descriptor \
__used \
__attribute__((section("__verbose"), aligned(8))) = \
{ KBUILD_MODNAME, __func__, __FILE__, fmt, DEBUG_HASH, \
DEBUG_HASH2, __LINE__, _DPRINTK_FLAGS_DEFAULT }; \
if (__dynamic_dbg_enabled(descriptor)) \
printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
{ KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__, \
_DPRINTK_FLAGS_DEFAULT }; \
JUMP_LABEL(&descriptor.enabled, do_printk); \
goto out; \
do_printk: \
printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
out: ; \
} while (0)
#define dynamic_dev_dbg(dev, fmt, ...) do { \
__label__ do_printk; \
__label__ out; \
static struct _ddebug descriptor \
__used \
__attribute__((section("__verbose"), aligned(8))) = \
{ KBUILD_MODNAME, __func__, __FILE__, fmt, DEBUG_HASH, \
DEBUG_HASH2, __LINE__, _DPRINTK_FLAGS_DEFAULT }; \
if (__dynamic_dbg_enabled(descriptor)) \
dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
{ KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__, \
_DPRINTK_FLAGS_DEFAULT }; \
JUMP_LABEL(&descriptor.enabled, do_printk); \
goto out; \
do_printk: \
dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
out: ; \
} while (0)
#else