linux-kernel - Re: [patch 08/36] Hexagon: Add delay functions

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Message-ID: <101063053.zZmSHVMM0X@wuerfel>
Date:	Wed, 17 Aug 2011 21:38:35 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Richard Kuo <rkuo@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-hexagon@...r.kernel.org
Subject: Re: [patch 08/36] Hexagon: Add delay functions

On Wednesday 17 August 2011 11:35:05 Richard Kuo wrote:
> +#include <asm/param.h>
> +
> +extern void __udelay(unsigned long usecs);
> +
> +#define udelay(usecs) __udelay((usecs))
> +
> +extern void __delay(unsigned long loops);

If you have any kind of reliable timer register, it's better
to poll that than to rely on a delay loop that is especially
inaccurate when running under a hypervisor.

That also speeds up boot time because you no longer need to
calibrate the delay loop.

	Arnd
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