Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 73e797f7 authored by Hanjun Guo's avatar Hanjun Guo Committed by Rafael J. Wysocki
Browse files

Documentation / CPU hotplug: Rephrase the outdated description for MADT entries 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: default avatarRafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 86393865

Documentation/cpu-hotplug.txt

+4 −2
Original line number Diff line number Diff line
@@ -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.



User Space Notification