linux-kernel - Re: [PATCH 09/23] clocksource: add block notifier

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Date:	Wed, 31 Jan 2007 18:22:07 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org, johnstul@...ibm.com,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 09/23] clocksource: add block notifier


* Daniel Walker <dwalker@...sta.com> wrote:

> > secondly, CLOCKSOURCE_NOTIFY_REGISTER is only used by the core 
> > clocksource code and no register-notifier interface is exposed: this 
> > makes the whole thing an expensive NOP.
> 
> I don't know what you mean when you say "no register-notifier 
> interface is exposed" .. The timekeeping code doesn't use this 
> notification , but it really should. [...]

what i say is that there's no public interface exposed of this notifier
(and even if there was, there isnt any user of it) and there's only a
single notifier used internally: this means that this thing is an
expensive function call.

	Ingo
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