Documentation / CPU hotplug: Rephrase the outdated description for MADT entries
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>
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@ -370,8 +370,10 @@ A: There is no clear spec defined way from ACPI that can give us that
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CPUs in MADT as hotpluggable CPUS. In the case there are no disabled CPUS
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we assume 1/2 the number of CPUs currently present can be hotplugged.
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Caveat: Today's ACPI MADT can only provide 256 entries since the apicid field
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in MADT is only 8 bits.
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Caveat: ACPI MADT can only provide 256 entries in systems with only ACPI 2.0c
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or earlier ACPI version supported, because the apicid field in MADT is only
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8 bits. From ACPI 3.0, this limitation was removed since the apicid field
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was extended to 32 bits with x2APIC introduced.
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User Space Notification
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