linux-kernel - Re: [PATCH] Option to disable AMD C1E (allows dynticks to work)

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Message-ID: <20071218154351.GC3974@ucw.cz>
Date:	Tue, 18 Dec 2007 15:43:52 +0000
From:	Pavel Machek <pavel@....cz>
To:	Eduard-Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Option to disable AMD C1E (allows dynticks to work)

On Fri 2007-12-14 00:47:10, Eduard-Gabriel Munteanu wrote:
> Some multiprocessor 64-bit AMD systems don't allow the user to disable
> the C1E C-state. The kernel detects C1E and marks the LAPIC as
> broken, thereby disabling dynticks. This patch adds an option to
> disable C1E when detected. It also allows the user to enable this
> processor feature even if that means disabling dynticks, which is
> useful in case C1E might provide better power savings (e.g.: C-states
> beyond C1 don't work). Tested on a Turion X2 TL-56 laptop. Thanks to
> Mikhail Kshevetskiy and FreeBSD for pointing out the relevant AMD docs.
...

> +static int __cpuinit force_amd_c1e(char *str) {

{ on new line, please.

> +	disable_amd_c1e = 0;
> +	return 1;
> +}
-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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