• Zhao Yakui's avatar
    ACPI: Rename ACPI processor device bus ID · 7a04b849
    Zhao Yakui authored
    Some BIOS re-use the same processor bus id
    in different scope:
    
    	\_SB.SCK0.CPU0
    	\_SB.SCK1.CPU0
    
    But the (deprecated) /proc/acpi/ interface
    assumes the bus-id's are unique, resulting in an OOPS
    when the processor driver is loaded:
    
    WARNING: at fs/proc/generic.c:590 proc_register+0x148/0x180()
    Hardware name: Sunrise Ridge
    proc_dir_entry 'processor/CPU0' already registered
    Call Trace:
     [<ffffffff8023f7ef>] warn_slowpath+0xb1/0xe5
     [<ffffffff8036243b>] ? ida_get_new_above+0x190/0x1b1
     [<ffffffff803625a8>] ? idr_pre_get+0x5f/0x75
     [<ffffffff8030b2f6>] proc_register+0x148/0x180
     [<ffffffff8030b4ff>] proc_mkdir_mode+0x3d/0x52
     [<ffffffff8030b525>] proc_mkdir+0x11/0x13
     [<ffffffffa0014b89>] acpi_processor_start+0x755/0x9bc [processor]
    
    Rename the processor device bus id. And the new bus id will be
    generated as the following format:
    	CPU+ CPU ID
    
    For example: If the cpu ID is 5, then the bus ID will be "CPU5".
    	If the CPU ID is 10, then the bus ID will be "CPUA".
    
    Yes, this will change the directory names seen
    in /proc/acpi/processor/* on some systems.
    Before this patch, those directory names where
    totally arbitrary strings based on the interal AML device strings.
    
    http://bugzilla.kernel.org/show_bug.cgi?id=13612Signed-off-by: default avatarZhao Yakui <yakui.zhao@intel.com>
    Signed-off-by: default avatarLen Brown <len.brown@intel.com>
    7a04b849
processor_core.c 30.8 KB