linux-kernel - Re: [PATCH] clocksource/cadence_ttc: Reuse clocksource as sched

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Date:	Fri, 5 Jul 2013 08:30:47 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Soren Brinkmann <soren.brinkmann@...inx.com>
cc:	John Stultz <john.stultz@...aro.org>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Michal Simek <michal.simek@...inx.com>
Subject: Re: [PATCH] clocksource/cadence_ttc: Reuse clocksource as
 sched_clock

On Wed, 3 Jul 2013, Soren Brinkmann wrote:

> Reuse the TTC clocksource timer as sched clock, too. Since only a single
> sched clock is supported in Linux, this feature optional and can be
> selected through Kconfig.

This changelog doesn't make sense.

There can be only one active sched_clock, but that does no mean, that
you cannot have different implementations compiled in.

So if you disable this config which sched_clock is your kernel using?
And if you enable it, how is guaranteed that you end up with the ttc
sched_clock as the active one? Just due to initcall ordering?

Thanks,

	tglx
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