u-boot/include/linux/printk.h
Masahiro Yamada b44b30260f printk: collect printk stuff into <linux/printk.h> with loglevel support
When we import code from Linux, with regular re-sync planned, we want
to use printk() and pr_*().  U-Boot does not support them in a clean
way.  So, people end up with local macros, or compat headers here and
there, then we occasionally see build errors of definition conflicts.

We have include/linux/compat.h, but putting all sorts of unrelated
things into a single header is just a temporal workaround.  Hence this
patch, to find the best home for all printk variants.  If you want to
use printk() and friends, please include <linux/printk.h>.  This header
is self-contained, and pulls in only a few headers.

When I was testing this clean-up, I noticed the image size exceeded
its platform limit on some boards.  This is because all pr_*() that
were previously defined as no-op in include/linux/mtd/mtd.h (unless
CONFIG_MTD_DEBUG is set), are now enabled.

To make such boards happy, this commit also implements CONFIG_LOGLEVEL.
The concept is similar to the kernel parameter "loglevel".  (Actually,
the Kconfig help message was taken from kernel-paremeter.txt of Linux)
Messages with a loglevel smaller than console loglevel will be printed.

The difference is the loglevel is build-time determined.  To save the
image size, lower priority pr_*() are compiled out.  I set the default
of CONFIG_LOGLEVEL to 6, i.e. pr_notice and higher priority messages
are compiled in.

I adjusted CONFIG_LOGLEVEL to avoid build error for some boards.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
[trini: Add in SPL_LOGLEVEL that is the same as LOGLEVEL]
Signed-off-by: Tom Rini <trini@konsulko.com>
2017-10-04 10:31:17 -04:00

79 lines
1.7 KiB
C

#ifndef __KERNEL_PRINTK__
#define __KERNEL_PRINTK__
#include <stdio.h>
#include <linux/compiler.h>
#define KERN_EMERG
#define KERN_ALERT
#define KERN_CRIT
#define KERN_ERR
#define KERN_WARNING
#define KERN_NOTICE
#define KERN_INFO
#define KERN_DEBUG
#define KERN_CONT
#define printk(fmt, ...) \
printf(fmt, ##__VA_ARGS__)
/*
* Dummy printk for disabled debugging statements to use whilst maintaining
* gcc's format checking.
*/
#define no_printk(fmt, ...) \
({ \
if (0) \
printk(fmt, ##__VA_ARGS__); \
0; \
})
#define __printk(level, fmt, ...) \
({ \
level < CONFIG_LOGLEVEL ? printk(fmt, ##__VA_ARGS__) : 0; \
})
#ifndef pr_fmt
#define pr_fmt(fmt) fmt
#endif
#define pr_emerg(fmt, ...) \
__printk(0, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_alert(fmt, ...) \
__printk(1, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_crit(fmt, ...) \
__printk(2, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_err(fmt, ...) \
__printk(3, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_warning(fmt, ...) \
__printk(4, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_warn pr_warning
#define pr_notice(fmt, ...) \
__printk(5, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_info(fmt, ...) \
__printk(6, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_cont(fmt, ...) \
printk(fmt, ##__VA_ARGS__)
/* pr_devel() should produce zero code unless DEBUG is defined */
#ifdef DEBUG
#define pr_devel(fmt, ...) \
__printk(7, pr_fmt(fmt), ##__VA_ARGS__)
#else
#define pr_devel(fmt, ...) \
no_printk(pr_fmt(fmt), ##__VA_ARGS__)
#endif
#ifdef DEBUG
#define pr_debug(fmt, ...) \
__printk(7, pr_fmt(fmt), ##__VA_ARGS__)
#else
#define pr_debug(fmt, ...) \
no_printk(pr_fmt(fmt), ##__VA_ARGS__)
#endif
#define printk_once(fmt, ...) \
printk(fmt, ##__VA_ARGS__)
#endif