[U-Boot] [U-Boot, v2, 2/8] printk: collect printk stuff into <linux/printk.h> with loglevel support

[Tom Rini]

On Sat, Sep 16, 2017 at 02:10:40PM +0900, Masahiro Yamada wrote:

> 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 at socionext.com>

Applied to u-boot/master, thanks!

-- 
Tom
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