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    [IA64] Count disabled cpus as potential hot-pluggable CPUs · a6b14fa6
    Ashok Raj 提交于
    Have a facility to account for potentially hot-pluggable CPUs. ACPI doesnt
    give a determinstic method to find hot-pluggable CPUs. Hence we use 2 methods
    to assist.
    
    - BIOS can mark potentially hot-pluggable CPUs as disabled in the MADT tables.
    - User can specify the number of hot-pluggable CPUs via parameter
      additional_cpus=X
    
    The option is enabled only if ACPI_CONFIG_HOTPLUG_CPU=y which enables the
    physical hotplug option. Without which user can still use logical onlining
    and offlining of CPUs by enabling CONFIG_HOTPLUG_CPU=y
    
    Adds more bits to cpu_possible_map for potentially hot-pluggable cpus.
    Signed-off-by: NAshok Raj <ashok.raj@intel.com>
    Signed-off-by: NTony Luck <tony.luck@intel.com>
    a6b14fa6
acpi.c 24.3 KB