linux-kernel - Re: [PATCH] sched: Support current clocksource handling in fallback sched

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Message-ID: <alpine.LFD.2.00.0905281417500.3397@localhost.localdomain>
Date:	Thu, 28 May 2009 14:22:17 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Paul Mundt <lethal@...ux-sh.org>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Daniel Walker <dwalker@...o99.com>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Victor <linux@...im.org.za>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	John Stultz <johnstul@...ux.vnet.ibm.com>
Subject: Re: [PATCH] sched: Support current clocksource handling in fallback
 sched_clock().

On Thu, 28 May 2009, Paul Mundt wrote:
> @@ -437,10 +441,19 @@ void clocksource_unregister(struct clocksource *cs)
>  	unsigned long flags;
>  
>  	spin_lock_irqsave(&clocksource_lock, flags);
> +
> +	if (sched_clocksource == cs) {
> +		printk(KERN_WARNING "Refusing to unregister "
> +		       "scheduler clocksource %s", cs->name);

  Hmm, isn't that dangerous ? The clocksource might be in a module or
  in kmalloced memory which is going to be freed.

Thanks,

	tglx
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