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| author | Hanjun Guo <hanjun.guo@linaro.org> | 2013-06-21 17:09:18 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-06-21 13:42:17 +0200 |
| commit | 73e797f79e5edb3d000d1911a2d859f15c446c1a (patch) | |
| tree | fa6dcc5d676cb1860d17383f6201f64c83e92d5d /Documentation/cpu-hotplug.txt | |
| parent | 86393865f0c9f7002aa1fc2b8bdce11f3aefcebe (diff) | |
| download | linux-73e797f79e5edb3d000d1911a2d859f15c446c1a.tar.gz linux-73e797f79e5edb3d000d1911a2d859f15c446c1a.tar.bz2 linux-73e797f79e5edb3d000d1911a2d859f15c446c1a.zip | |
Documentation / CPU hotplug: Rephrase the outdated description for MADT entries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>
Diffstat (limited to 'Documentation/cpu-hotplug.txt')
| -rw-r--r-- | Documentation/cpu-hotplug.txt | 6 |
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 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 |