Messages in this thread Patch in this message | | | From | Hanjun Guo <> | Subject | [PATCH v2] Documentation / cpu hotplug: Rephrase the outdated description for MADT entries | Date | Fri, 21 Jun 2013 17:09:18 +0800 |
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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 <rjw@sisk.pl> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> --- 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 -- 1.7.9.5
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