>>
>> config ACPI_PROCESSOR
>> tristate "Processor"
>> default y
>> help
>> This driver installs ACPI as the idle handler for Linux, and uses
>> ACPI C2 and C3 processor states to save power, on systems that
>> support it. It is required by several flavors of cpufreq
>> Performance-state drivers.
>>
>> ...
>>
>> Is more logical for me to do it here but I may be wrong.
>
> ACPI_PROCESSOR supports C-states and P-states and is not directly
> related to support for system sleep states. If your system is recent,
> then it is likely that you want to enable this (and cpufreq) to save power --
> even if you are not interested in system-wide sleep states.
Btw nothing about HOTPLUG_CPU now but something is broken.
do a defconfig , make menuconfig , disable ACPI , make , and you get :
...
In file included from arch/i386/kernel/acpi/cstate.c:16:
include/acpi/processor.h:90: error: expected specifier-qualifier-list before 'acpi_integer'
include/acpi/processor.h:108: error: expected specifier-qualifier-list before 'acpi_integer'
include/acpi/processor.h:131: error: expected specifier-qualifier-list before 'acpi_integer'
include/acpi/processor.h:149: error: expected specifier-qualifier-list before 'acpi_integer'
include/acpi/processor.h:205: error: expected specifier-qualifier-list before 'acpi_handle'
include/acpi/processor.h:319: warning: 'struct acpi_device' declared inside parameter list
include/acpi/processor.h:319: warning: its scope is only this definition or declaration, which is probably not what you want
include/acpi/processor.h:322: warning: 'struct acpi_device' declared inside parameter list
make[2]: *** [arch/i386/kernel/acpi/cstate.o] Error 1
make[1]: *** [arch/i386/kernel/acpi] Error 2
...
$ grep ACPI .config
# Power management options (ACPI, APM)
# CONFIG_ACPI is not set
CONFIG_ACPI_PROCESSOR=y
CONFIG_X86_ACPI_CPUFREQ=y
CONFIG_X86_POWERNOW_K8_ACPI=y
CONFIG_X86_ACPI_CPUFREQ_PROC_INTF=y
Looks like CONFIG_X86_POWERNOW_K8_ACPI selects only ACPI_PROCESSOR , guessing it should depend on ACPI ?
>
> -Len
>
Gabriel
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