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 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.

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