Re: [PATCH] introduce boot_printk()

["H. Peter Anvin" <hpa@zytor.com>]

Yinghai Lu wrote:
> 
> it seem using pci_printk or acpi_printk.. could be more flexible.
> 
> otherwise will need to keep update linux/kernel.h to add so call subsys tags...
> 
> use only need to
> have DEFINE_LOGLEVEL_SETUP(xxx) in c
> and have DECLARE_LOGLEVEL(xxx) in .h
> then just use xxx_printk
> 

Uh?  You can add the subsys tags elsewhere if you prefer too.

However, there are a few important differences to keep in mind.  Tags 
get logged in the dmesg buffer even if not printed to the kernel, 
whereas a jump-based architecture will not just suppress the output, but 
even the formatting of the output.  Either is a good thing for certain 
things, and a bad thing for other things.

I personally think the kind of things discussed belong in the category 
of "always put in the dmesg buffer", and like the idea of 
subsystem-tagging them.

	-hpa