From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Zachary Amsden <zach@vmware.com>
Cc: Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@osdl.org>,
Chris Wright <chrisw@osdl.org>,
Linus Torvalds <torvalds@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Virtualization Mailing List <virtualization@lists.osdl.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Martin Bligh <mbligh@mbligh.org>,
Pratap Subrahmanyam <pratap@vmware.com>,
Christopher Li <chrisl@vmware.com>,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH 14/21] i386 Apm is on cpu zero only
Date: Tue, 08 Nov 2005 13:54:51 +0000 [thread overview]
Message-ID: <1131458091.25192.29.camel@localhost.localdomain> (raw)
In-Reply-To: <43709FD7.1030905@vmware.com>
On Maw, 2005-11-08 at 04:53 -0800, Zachary Amsden wrote:
> Can't hurt, and APM is largely obsolete because of ACPI, so I'm only
> concerned with trimming and keeping adequate protection of the kernel
> from APM code while maintaining correctness. I don't have a nice set of
> old machines with enough wacky APM BIOSen to validate that unpinning the
> CPU is ok.
A large number of SMP machines, probably the majority of APM based ones
require that APM calls occur on CPU#0. As I understand it from a BIOS
engineer involved in debugging that problem Redmond always does APM from
CPU #0 and may even guarantee it.
Alan
next prev parent reply other threads:[~2005-11-08 13:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-08 4:33 [PATCH 14/21] i386 Apm is on cpu zero only Zachary Amsden
2005-11-08 7:33 ` Ingo Molnar
2005-11-08 12:53 ` Zachary Amsden
2005-11-08 13:54 ` Alan Cox [this message]
2005-11-08 13:26 ` Ingo Molnar
2005-11-08 14:51 ` H. Peter Anvin
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