linux-kernel - Re: [PATCH] x86: Bypass legacy PIC and PIT on ACPI hardware reduced platform

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Date:	Wed, 04 Mar 2015 15:38:02 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Li, Aubrey" <aubrey.li@...ux.intel.com>,
	"alan@...ux.intel.com" <alan@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Len.Brown@...el.com,
	x86@...nel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Bypass legacy PIC and PIT on ACPI hardware reduced platform

On Wednesday, March 04, 2015 03:05:55 PM Borislav Petkov wrote:
> On Wed, Mar 04, 2015 at 03:16:07PM +0100, Rafael J. Wysocki wrote:
> > Sort of.  What we need is a "do not touch PIC/PIT" bit for the code that
> > tries to fall back to them in some cases (which may appear to work if
> > the hardware is physically there, but it may confuse the platform).
> 
> Can "some cases" detection be nicely put into a x86_platform
> platform-specific method?

I guess so.

The problem is that we just do that fallback unconditionally today which
evidently doesn't always work.

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