linux-kernel - Re: [PATCH] x86: hpet: Don't default CONFIG_HPET_TIMER to be y for X86

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Message-ID: <53348199.7070207@mit.edu>
Date:	Thu, 27 Mar 2014 12:52:57 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Clemens Ladisch <clemens@...isch.de>,
	Feng Tang <feng.tang@...el.com>, tglx@...utronix.de,
	mingo@...e.hu, hpa@...or.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: hpet: Don't default CONFIG_HPET_TIMER to be y for
 X86_64

On 03/27/2014 04:02 AM, Clemens Ladisch wrote:
> Feng Tang wrote:
>> On many new phone/tablet platforms like Baytrail/Merrifield etc,
>> the HPET are either defeatured or has some problem to be used
>> as a reliable timer. As these platforms also have X86_64, we
>> should not make HPET_TIMER default y for all X86_64.

Wouldn't it be better to fix the hpet driver so that the hpet doesn't
used on these platforms?

> 
> The help text still says:
> | You can safely choose Y here.  [...]
> | Choose N to continue using the legacy 8254 timer.
> 
> Are these statements still true for those platforms?

They aren't true for modern desktop and server platforms -- the TSC is
used regardless of hpet availability.

> 
> 
> Regards,
> Clemens
> 

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