>> >> 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 - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
