linux-kernel - Re: [PATCH 0/6] loglevel=pci:8,acpi:8,apic=8 support v5

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Date:	Wed, 17 Sep 2008 11:30:59 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] loglevel=pci:8,acpi:8,apic=8 support v5

On Wed, Sep 17, 2008 at 12:10:09AM -0700, Yinghai Lu wrote:
>     KERN_PCI
>     KERN_ACPI
> v4: fix some checkpatch error and warning
> v5: add default with DEFINE_LOGLEVE_SETUP_DEF
>     KERN_APIC
> 
> 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

I think all of this is overdesigned and stupid.

People expecting that loglevels are exactly right so they can calm messages
are like security-savvy people who expect all security relevant bugfixes carry
CVE tag.

grep says there are 50757 printk calls, only 32129 of them carry KERN_ tag.

Oh, and new and improved logs:

	[    0.340326] pci 0000:00:01.0: PME# supported from D0 D3hot D3cold
	[    0.340326] pci 0000:00:01.0: PME# disabled
	[    0.340326] <pci>PCI: 0000:00:1a.0 reg 20 io port: [dc00, dc1f]
	[    0.340413] <pci>PCI: 0000:00:1a.1 reg 20 io port: [e000, e01f]
	[    0.340549] <pci>PCI: 0000:00:1a.7 reg 10 32bit mmio: [febffc00, febfffff]
		       ^^^^^^^^^

How this can be an improvement for those who boot with ignore_loglevel,
I don't know.
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