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From: Alan Cox <alan@linux.intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Arjan van de Ven <arjan@linux.intel.com>,
	Ingo Molnar <mingo@kernel.org>,
	"Li, Aubrey" <aubrey.li@linux.intel.com>,
	"H. Peter Anvin" <hpa@linux.intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Len.Brown@intel.com, x86@kernel.org,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86: Bypass legacy PIC and PIT on ACPI hardware reduced platform
Date: Wed, 04 Mar 2015 20:21:01 +0000	[thread overview]
Message-ID: <1425500461.3838.140.camel@linux.intel.com> (raw)
In-Reply-To: <20150304140555.GG3516@pd.tnic>

On Wed, 2015-03-04 at 15:05 +0100, 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?

In some cases they don't belong in x86, ACPI is also used for ARM64.

However

	if ( has_8259_pic() )

is trivally 0, 1 or some platform or acpi provided method.



  parent reply	other threads:[~2015-03-04 20:21 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-04  3:23 Li, Aubrey
2015-03-04  5:08 ` Ingo Molnar
2015-03-04  5:26   ` Li, Aubrey
2015-03-04  5:31     ` Ingo Molnar
2015-03-04  6:04       ` Li, Aubrey
2015-03-04  7:37         ` Ingo Molnar
2015-03-04  8:43           ` Arjan van de Ven
2015-03-04  9:50             ` Borislav Petkov
2015-03-04 14:16               ` Rafael J. Wysocki
2015-03-04 14:05                 ` Borislav Petkov
2015-03-04 14:38                   ` Rafael J. Wysocki
2015-03-04 20:21                   ` Alan Cox [this message]
2015-03-04 21:52                     ` Rafael J. Wysocki
2015-03-05 11:26                       ` Li, Aubrey
2015-03-05 16:05                       ` Alan Cox
2015-03-04 14:36               ` Arjan van de Ven
2015-03-04 20:11                 ` Ingo Molnar
2015-03-05 11:13                   ` Li, Aubrey
2015-03-05 11:36                     ` Ingo Molnar
2015-03-05 12:42                       ` Li, Aubrey
2015-03-05 16:06                         ` Alan Cox
2015-03-09 23:26                         ` Li, Aubrey
2015-03-10  8:06                           ` Ingo Molnar
2015-03-11  4:14                             ` Li, Aubrey
2015-03-04 20:18               ` Alan Cox

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