X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=Documentation%2Fcpu-hotplug.txt;h=67f733d6f848d897fad19698fd2017675164d650;hb=405a1086bdd091d2d55db0ac905cd6332b35cec1;hp=9f401350f5021ce61eda8c6ce0a386bc93109d18;hpb=b2c6b3e0611c58fbeb6b9c0892b6249f7bdfaf6b;p=cascardo%2Flinux.git

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
    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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