linux-kernel - Re: sched_clock

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Message-Id: <201004152152.03883.arnd@arndb.de>
Date:	Thu, 15 Apr 2010 21:52:03 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	michal.simek@...alogix.com
Cc:	wuzhangjin@...il.com, Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: sched_clock - microblaze

On Thursday 15 April 2010 21:29:27 Michal Simek wrote:
> > sched_clock() {
> >       ftrace_stop();
> >       printk(...);
> >       ftrace_start();
> >       ...
> > }
> 
> But I am describing different problem. sched_clock is called before 
> kernel initialized timers. Microblaze takes all information from DTS 
> that's means that I am not able to read timer because I even don't know 
> where it is. :-(

You could make sched_clock return zero before the clock is probed, it
is very unlikely to be needed before that anyway.

	Arnd
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