linux-kernel - Re: [PATCH] sched: sched_clock() clocksource handling.

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Date:	Tue, 02 Jun 2009 14:26:25 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Daniel Walker <dwalker@...o99.com>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	Andrew Victor <linux@...im.org.za>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Stultz <johnstul@...ux.vnet.ibm.com>,
	linux-arm-kernel@...ts.arm.linux.org.uk, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: sched_clock() clocksource handling.

On Tue, 2009-06-02 at 16:54 +0900, Paul Mundt wrote:
> @@ -212,6 +213,7 @@ extern struct clocksource *clock;   /* current clocksource */
>  
>  #define CLOCK_SOURCE_WATCHDOG                  0x10
>  #define CLOCK_SOURCE_VALID_FOR_HRES            0x20
> +#define CLOCK_SOURCE_USE_FOR_SCHED_CLOCK       0x40

One more thing though, as John suggested, this bit might want a proper
comment explaining when a clocksource should and should not set this
bit.
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