From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753194Ab3FXLva (ORCPT ); Mon, 24 Jun 2013 07:51:30 -0400 Received: from hydra.sisk.pl ([212.160.235.94]:48982 "EHLO hydra.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750824Ab3FXLv2 (ORCPT ); Mon, 24 Jun 2013 07:51:28 -0400 From: "Rafael J. Wysocki" To: Hanjun Guo Cc: Rob Landley , Rusty Russell , Srivatsa Vaddagiri , linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, patches@linaro.org, linaro-kernel@lists.linaro.org Subject: Re: [PATCH v2] Documentation / cpu hotplug: Rephrase the outdated description for MADT entries Date: Mon, 24 Jun 2013 14:00:53 +0200 Message-ID: <2689985.7MvxW2GhJV@vostro.rjw.lan> User-Agent: KMail/4.9.5 (Linux/3.10.0-rc5+; KDE/4.9.5; x86_64; ; ) In-Reply-To: <1371805758-2841-1-git-send-email-hanjun.guo@linaro.org> References: <1371805758-2841-1-git-send-email-hanjun.guo@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Friday, June 21, 2013 05:09:18 PM Hanjun Guo wrote: > More than 256 entries in ACPI MADT is supported from ACPI 3.0, so the > information should be updated. > > -v2: Rephrase the information instead of simply removing it according > to Rafael's advice. Queued up for 3.11. Thanks, Rafael > Suggested-by: Rafael J. Wysocki > Signed-off-by: Hanjun Guo > --- > Documentation/cpu-hotplug.txt | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt > index 9f40135..67f733d 100644 > --- a/Documentation/cpu-hotplug.txt > +++ b/Documentation/cpu-hotplug.txt > @@ -370,8 +370,10 @@ A: There is no clear spec defined way from ACPI that can give us that > CPUs in MADT as hotpluggable CPUS. In the case there are no disabled CPUS > we assume 1/2 the number of CPUs currently present can be hotplugged. > > - Caveat: Today's ACPI MADT can only provide 256 entries since the apicid field > - in MADT is only 8 bits. > + Caveat: ACPI MADT can only provide 256 entries in systems with only ACPI 2.0c > + or earlier ACPI version supported, because the apicid field in MADT is only > + 8 bits. From ACPI 3.0, this limitation was removed since the apicid field > + was extended to 32 bits with x2APIC introduced. > > User Space Notification > > -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.