usage:
	in .c to have
		DEFINE_LOGLEVEL_SETUP(pci, "pci:");
	in .h to have
		DECLARE_LOGLEVE(pci);
	then could use
		pci_printk(KERN_LOG_DEBUG, fmt, ...);
	and command line
		loglevel=pci:7

you can add different printk to different files of one subsys if you like
not just one susbsys one tag, and don't need to update kernel.h to add more tags

YH

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