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printk: collect printk stuff into <linux/printk.h> with loglevel support

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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>
This commit is contained in:
Masahiro Yamada 2017-09-16 14:10:40 +09:00 • committed by Tom Rini
parent 7fea7b1a37
commit b44b30260f
20 changed files with 112 additions and 39 deletions
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11
include/linux/compat.h
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@ -25,17 +25,6 @@ extern struct p_current *current;
printf(fmt, ##args)
#define dev_warn(dev, fmt, args...) \
printf(fmt, ##args)
#define printk printf
#define printk_once printf
#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 GFP_ATOMIC ((gfp_t) 0)
#define GFP_KERNEL ((gfp_t) 0)