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From: Yinghai Lu <yhlu.kernel@gmail.com>
To: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
       "H. Peter Anvin" <hpa@zytor.com>,
       Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, Yinghai Lu <yhlu.kernel@gmail.com>
Subject: [PATCH 0/6] loglevel=pci:8,acpi:8,apic=8 support v6
Date: Wed, 17 Sep 2008 01:27:41 -0700
Message-Id: <1221640067-24389-1-git-send-email-yhlu.kernel@gmail.com>
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    KERN_PCI
    KERN_ACPI
v4: fix some checkpatch error and warning
v5: add default with DEFINE_LOGLEVE_SETUP_DEF
    KERN_APIC
v6: set the default only one time

usage:
	in .h to have
		#define KERN_PCI "<pci>"
	in .c to have
		DEFINE_LOGLEVEL_SETUP(pci, KERN_PCI, "pci:");
	then could use
		printk(KERN_DEBUG KERN_PCI fmt, ...);
	and command line
		loglevel=3,pci:8

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