linux-kernel - Re: netconsole and a serial one

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Message-ID: <x498wtkl3lu.fsf@segfault.boston.devel.redhat.com>
Date:	Mon, 22 Sep 2008 09:19:57 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	"Jon Smirl" <jonsmirl@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, dhowells@...hat.com
Subject: Re: netconsole and a serial one

"Jon Smirl" <jonsmirl@...il.com> writes:

> I have both netconsole and a serial console setup on an embedded
> system. This is what I need for the boot process.
>
> After I'm booted I want to turn off printk() output to the serial
> console but keep it going to netconsole.
> I've been googling for an hour, how do I do this?
>
> I need to turn off the serial output after boot because serial
> printk() disables interrupts for up to 1ms which is enough to cause me
> to lose a lot of other interrupts.

There's no way (that I know of) to do this presently.  However, I think
David Howells has been working on a patch that reduces the amount of
time printk spends with IRQs disabled.

David?

Cheers,

Jeff
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