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authorHanjun Guo <hanjun.guo@linaro.org>2013-06-21 05:09:18 -0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-06-21 07:42:17 -0400
commit73e797f79e5edb3d000d1911a2d859f15c446c1a (patch)
treefa6dcc5d676cb1860d17383f6201f64c83e92d5d
parent86393865f0c9f7002aa1fc2b8bdce11f3aefcebe (diff)
Documentation / CPU hotplug: Rephrase the outdated description for MADT entries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>
-rw-r--r--Documentation/cpu-hotplug.txt6
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt
index 9f401350f502..67f733d6f848 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
370 CPUs in MADT as hotpluggable CPUS. In the case there are no disabled CPUS 370 CPUs in MADT as hotpluggable CPUS. In the case there are no disabled CPUS
371 we assume 1/2 the number of CPUs currently present can be hotplugged. 371 we assume 1/2 the number of CPUs currently present can be hotplugged.
372 372
373 Caveat: Today's ACPI MADT can only provide 256 entries since the apicid field 373 Caveat: ACPI MADT can only provide 256 entries in systems with only ACPI 2.0c
374 in MADT is only 8 bits. 374 or earlier ACPI version supported, because the apicid field in MADT is only
375 8 bits. From ACPI 3.0, this limitation was removed since the apicid field
376 was extended to 32 bits with x2APIC introduced.
375 377
376User Space Notification 378User Space Notification
377 379