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From: "Nikita V. Youshchenko" <yoush@cs.msu.su>
To: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: PREEMPT_RT (2.6.33-rt17) disabled printk-to-console after console_init
Date: Thu, 20 May 2010 12:33:55 +0400
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> > I could not get dmesg output to console/serial and
> > klogd(/var/log/messages) anymore with 2.6.33-rt17 _after_ the kernel
> > boot is done(on non-RT kernel it works fine). I made below changes it
> > starts to work again, however I'm unsure how safe the change is.
> > Please advise.
>
> Well, obviously it's unsafe if you remove safety checks. And if you
> care to look at the changelog of kernel/printk.c you'll find out why.

Hmm... did a quick look and could not find anything related there.
Could you please give a pointer?