| Message ID | 1371805758-2841-1-git-send-email-hanjun.guo@linaro.org |
|---|---|
| State | Accepted |
| Commit | 73e797f79e5edb3d000d1911a2d859f15c446c1a |
| Headers | show |
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. > > User Space Notification > >
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. User Space Notification
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. 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(-)