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linux-stable/include/linux/dev_printk.h
Geert Uytterhoeven 5391368a87 dev_printk: Add and use dev_no_printk() 
[ Upstream commit c26ec79904 ]

When printk-indexing is enabled, each dev_printk() invocation emits a
pi_entry structure.  This is even true when the dev_printk() is
protected by an always-false check, as is typically the case for debug
messages: while the actual code to print the message is optimized out by
the compiler, the pi_entry structure is still emitted.

Avoid emitting pi_entry structures for unavailable dev_printk() kernel
messages by:
  1. Introducing a dev_no_printk() helper, mimicked after the existing
     no_printk() helper, which calls _dev_printk() instead of
     dev_printk(),
  2. Replacing all "if (0) dev_printk(...)" constructs by calls to the
     new helper.

This reduces the size of an arm64 defconfig kernel with
CONFIG_PRINTK_INDEX=y by 957 KiB.

Fixes: ad7d61f159 ("printk: index: Add indexing support to dev_printk")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Chris Down <chris@chrisdown.name>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/8583d54f1687c801c6cda8edddf2cf0344c6e883.1709127473.git.geert+renesas@glider.be
Signed-off-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-06-16 13:39:27 +02:00

279 lines
9.2 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* dev_printk.h - printk messages helpers for devices
*
* Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
* Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
* Copyright (c) 2008-2009 Novell Inc.
*
*/
#ifndef _DEVICE_PRINTK_H_
#define _DEVICE_PRINTK_H_
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/ratelimit.h>
#ifndef dev_fmt
#define dev_fmt(fmt) fmt
#endif
struct device;
#define PRINTK_INFO_SUBSYSTEM_LEN 16
#define PRINTK_INFO_DEVICE_LEN 48
struct dev_printk_info {
char subsystem[PRINTK_INFO_SUBSYSTEM_LEN];
char device[PRINTK_INFO_DEVICE_LEN];
};
#ifdef CONFIG_PRINTK
__printf(3, 0) __cold
int dev_vprintk_emit(int level, const struct device *dev,
const char *fmt, va_list args);
__printf(3, 4) __cold
int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
__printf(3, 4) __cold
void _dev_printk(const char *level, const struct device *dev,
const char *fmt, ...);
__printf(2, 3) __cold
void _dev_emerg(const struct device *dev, const char *fmt, ...);
__printf(2, 3) __cold
void _dev_alert(const struct device *dev, const char *fmt, ...);
__printf(2, 3) __cold
void _dev_crit(const struct device *dev, const char *fmt, ...);
__printf(2, 3) __cold
void _dev_err(const struct device *dev, const char *fmt, ...);
__printf(2, 3) __cold
void _dev_warn(const struct device *dev, const char *fmt, ...);
__printf(2, 3) __cold
void _dev_notice(const struct device *dev, const char *fmt, ...);
__printf(2, 3) __cold
void _dev_info(const struct device *dev, const char *fmt, ...);
#else
static inline __printf(3, 0)
int dev_vprintk_emit(int level, const struct device *dev,
const char *fmt, va_list args)
{ return 0; }
static inline __printf(3, 4)
int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
{ return 0; }
static inline void __dev_printk(const char *level, const struct device *dev,
struct va_format *vaf)
{}
static inline __printf(3, 4)
void _dev_printk(const char *level, const struct device *dev,
const char *fmt, ...)
{}
static inline __printf(2, 3)
void _dev_emerg(const struct device *dev, const char *fmt, ...)
{}
static inline __printf(2, 3)
void _dev_crit(const struct device *dev, const char *fmt, ...)
{}
static inline __printf(2, 3)
void _dev_alert(const struct device *dev, const char *fmt, ...)
{}
static inline __printf(2, 3)
void _dev_err(const struct device *dev, const char *fmt, ...)
{}
static inline __printf(2, 3)
void _dev_warn(const struct device *dev, const char *fmt, ...)
{}
static inline __printf(2, 3)
void _dev_notice(const struct device *dev, const char *fmt, ...)
{}
static inline __printf(2, 3)
void _dev_info(const struct device *dev, const char *fmt, ...)
{}
#endif
/*
* Need to take variadic arguments even though we don't use them, as dev_fmt()
* may only just have been expanded and may result in multiple arguments.
*/
#define dev_printk_index_emit(level, fmt, ...) \
printk_index_subsys_emit("%s %s: ", level, fmt)
#define dev_printk_index_wrap(_p_func, level, dev, fmt, ...) \
({ \
dev_printk_index_emit(level, fmt); \
_p_func(dev, fmt, ##__VA_ARGS__); \
})
/*
* Some callsites directly call dev_printk rather than going through the
* dev_<level> infrastructure, so we need to emit here as well as inside those
* level-specific macros. Only one index entry will be produced, either way,
* since dev_printk's `fmt` isn't known at compile time if going through the
* dev_<level> macros.
*
* dev_fmt() isn't called for dev_printk when used directly, as it's used by
* the dev_<level> macros internally which already have dev_fmt() processed.
*
* We also can't use dev_printk_index_wrap directly, because we have a separate
* level to process.
*/
#define dev_printk(level, dev, fmt, ...) \
({ \
dev_printk_index_emit(level, fmt); \
_dev_printk(level, dev, fmt, ##__VA_ARGS__); \
})
/*
* Dummy dev_printk for disabled debugging statements to use whilst maintaining
* gcc's format checking.
*/
#define dev_no_printk(level, dev, fmt, ...) \
({ \
if (0) \
_dev_printk(level, dev, fmt, ##__VA_ARGS__); \
})
/*
* #defines for all the dev_<level> macros to prefix with whatever
* possible use of #define dev_fmt(fmt) ...
*/
#define dev_emerg(dev, fmt, ...) \
dev_printk_index_wrap(_dev_emerg, KERN_EMERG, dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_crit(dev, fmt, ...) \
dev_printk_index_wrap(_dev_crit, KERN_CRIT, dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_alert(dev, fmt, ...) \
dev_printk_index_wrap(_dev_alert, KERN_ALERT, dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_err(dev, fmt, ...) \
dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_warn(dev, fmt, ...) \
dev_printk_index_wrap(_dev_warn, KERN_WARNING, dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_notice(dev, fmt, ...) \
dev_printk_index_wrap(_dev_notice, KERN_NOTICE, dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_info(dev, fmt, ...) \
dev_printk_index_wrap(_dev_info, KERN_INFO, dev, dev_fmt(fmt), ##__VA_ARGS__)
#if defined(CONFIG_DYNAMIC_DEBUG) || \
(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
#define dev_dbg(dev, fmt, ...) \
dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
#elif defined(DEBUG)
#define dev_dbg(dev, fmt, ...) \
dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
#else
#define dev_dbg(dev, fmt, ...) \
dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
#endif
#ifdef CONFIG_PRINTK
#define dev_level_once(dev_level, dev, fmt, ...) \
do { \
static bool __print_once __read_mostly; \
\
if (!__print_once) { \
__print_once = true; \
dev_level(dev, fmt, ##__VA_ARGS__); \
} \
} while (0)
#else
#define dev_level_once(dev_level, dev, fmt, ...) \
do { \
if (0) \
dev_level(dev, fmt, ##__VA_ARGS__); \
} while (0)
#endif
#define dev_emerg_once(dev, fmt, ...) \
dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
#define dev_alert_once(dev, fmt, ...) \
dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
#define dev_crit_once(dev, fmt, ...) \
dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
#define dev_err_once(dev, fmt, ...) \
dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
#define dev_warn_once(dev, fmt, ...) \
dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
#define dev_notice_once(dev, fmt, ...) \
dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
#define dev_info_once(dev, fmt, ...) \
dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
#define dev_dbg_once(dev, fmt, ...) \
dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
#define dev_level_ratelimited(dev_level, dev, fmt, ...) \
do { \
static DEFINE_RATELIMIT_STATE(_rs, \
DEFAULT_RATELIMIT_INTERVAL, \
DEFAULT_RATELIMIT_BURST); \
if (__ratelimit(&_rs)) \
dev_level(dev, fmt, ##__VA_ARGS__); \
} while (0)
#define dev_emerg_ratelimited(dev, fmt, ...) \
dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
#define dev_alert_ratelimited(dev, fmt, ...) \
dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
#define dev_crit_ratelimited(dev, fmt, ...) \
dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
#define dev_err_ratelimited(dev, fmt, ...) \
dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
#define dev_warn_ratelimited(dev, fmt, ...) \
dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
#define dev_notice_ratelimited(dev, fmt, ...) \
dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
#define dev_info_ratelimited(dev, fmt, ...) \
dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
#if defined(CONFIG_DYNAMIC_DEBUG) || \
(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
/* descriptor check is first to prevent flooding with "callbacks suppressed" */
#define dev_dbg_ratelimited(dev, fmt, ...) \
do { \
static DEFINE_RATELIMIT_STATE(_rs, \
DEFAULT_RATELIMIT_INTERVAL, \
DEFAULT_RATELIMIT_BURST); \
DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
__ratelimit(&_rs)) \
__dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt), \
##__VA_ARGS__); \
} while (0)
#elif defined(DEBUG)
#define dev_dbg_ratelimited(dev, fmt, ...) \
do { \
static DEFINE_RATELIMIT_STATE(_rs, \
DEFAULT_RATELIMIT_INTERVAL, \
DEFAULT_RATELIMIT_BURST); \
if (__ratelimit(&_rs)) \
dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
} while (0)
#else
#define dev_dbg_ratelimited(dev, fmt, ...) \
dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
#endif
#ifdef VERBOSE_DEBUG
#define dev_vdbg dev_dbg
#else
#define dev_vdbg(dev, fmt, ...) \
dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
#endif
/*
* dev_WARN*() acts like dev_printk(), but with the key difference of
* using WARN/WARN_ONCE to include file/line information and a backtrace.
*/
#define dev_WARN(dev, format, arg...) \
WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg)
#define dev_WARN_ONCE(dev, condition, format, arg...) \
WARN_ONCE(condition, "%s %s: " format, \
dev_driver_string(dev), dev_name(dev), ## arg)
#endif /* _DEVICE_PRINTK_H_ */
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