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Wysocki" Cc: 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linaro-kernel@lists.linaro.org, Hanjun Guo Subject: [PATCH v2] Documentation / cpu hotplug: Rephrase the outdated description for MADT entries Date: Fri, 21 Jun 2013 17:09:18 +0800 Message-Id: <1371805758-2841-1-git-send-email-hanjun.guo@linaro.org> X-Mailer: git-send-email 1.7.9.5 X-Gm-Message-State: ALoCoQmFORMBWVPFf5Obe4KlgGIJsesqbpnbNbJsx1gcFSMADPjZGkoFsduVsMjfdrju6pMb9tvm X-Original-Sender: hanjun.guo@linaro.org X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 2607:f8b0:400c:c02::234 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , 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. 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