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

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Date:	Wed, 17 Sep 2008 09:23:03 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Alexey Dobriyan" <adobriyan@...il.com>,
	"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 1:47 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Alexey Dobriyan <adobriyan@...il.com> wrote:
>
>> 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]
>>                      ^^^^^^^^^

> and it's bad and a showstopper if the default output of 'dmesg'
> degrades, like your noticed - those are bugs in the concept and need to
> be fixed.

v6 should fix the problem, to support several seperate loglevel.

YH
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