• Thomas Renninger's avatar
    ACPI, intel_idle: Cleanup idle= internal variables · d1896049
    Thomas Renninger authored
    Having four variables for the same thing:
      idle_halt, idle_nomwait, force_mwait and boot_option_idle_overrides
    is rather confusing and unnecessary complex.
    
    if idle= boot param is passed, only set up one variable:
    boot_option_idle_overrides
    
    Introduces following functional changes/fixes:
      - intel_idle driver does not register if any idle=xy
        boot param is passed.
      - processor_idle.c will also not register a cpuidle driver
        and get active if idle=halt is passed.
        Before a cpuidle driver with one (C1, halt) state got registered
        Now the default_idle function will be used which finally uses
        the same idle call to enter sleep state (safe_halt()), but
        without registering a whole cpuidle driver.
    
    That means idle= param will always avoid cpuidle drivers to register
    with one exception (same behavior as before):
    idle=nomwait
    may still register acpi_idle cpuidle driver, but C1 will not use
    mwait, but hlt. This can be a workaround for IO based deeper sleep
    states where C1 mwait causes problems.
    Signed-off-by: default avatarThomas Renninger <trenn@suse.de>
    cc: x86@kernel.org
    Signed-off-by: default avatarLen Brown <len.brown@intel.com>
    d1896049
processor_core.c 8.17 KB