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Documentation / CPU hotplug: Rephrase the outdated description for MADT entries

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More than 256 entries in ACPI MADT is supported from ACPI 3.0, so the
information in should be Documentation/cpu-hotplug.txt updated.

[rjw: Changelog]
Suggested-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hanjun Guo 2013-06-21 17:09:18 +08:00 committed by Rafael J. Wysocki
parent 86393865f0
commit 73e797f79e
1 changed files with 4 additions and 2 deletions
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6
Documentation/cpu-hotplug.txt
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@ -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 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. 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 Caveat: ACPI MADT can only provide 256 entries in systems with only ACPI 2.0c
in MADT is only 8 bits. 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.
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