Subject: Re: MARKER mechanism, try 2
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Ingo Molnar <mingo@elte.hu>, "Frank Ch. Eigler" <fche@redhat.com>,
       Paul Mundt <lethal@linux-sh.org>,
       linux-kernel <linux-kernel@vger.kernel.org>, Jes Sorensen <jes@sgi.com>,
       Andrew Morton <akpm@osdl.org>, Tom Zanussi <zanussi@us.ibm.com>,
       Richard J Moore <richardj_moore@uk.ibm.com>,
       Michel Dagenais <michel.dagenais@polymtl.ca>,
       Christoph Hellwig <hch@infradead.org>,
       Greg Kroah-Hartman <gregkh@suse.de>,
       Thomas Gleixner <tglx@linutronix.de>, William Cohen <wcohen@redhat.com>,
       "Martin J. Bligh" <mbligh@mbligh.org>
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Date: Mon, 18 Sep 2006 20:39:44 +0100
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Ar Llu, 2006-09-18 am 13:47 -0400, ysgrifennodd Mathieu Desnoyers:
> "cannot use printk" (used in scheduler, NMIs, wakeup, printk itself)
>                     (nothing, kprobe, jumpprobe or tracer)

Also sometimes in character drivers - if it's the console device and you
printk in the driver code you go boom.

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