Re: [PATCH v9 14/21] ACPI / processor: Make it possible to get CPU hardware ID via GICC

[Hanjun Guo]

On 2015/3/5 23:19, Catalin Marinas wrote:
> On Thu, Mar 05, 2015 at 02:13:58PM +0100, Rafael J. Wysocki wrote:
>> On Thu, Mar 5, 2015 at 12:27 PM, Catalin Marinas
>> <catalin.marinas@xxxxxxx> wrote:
>>> On Thu, Mar 05, 2015 at 04:03:21PM +0800, Hanjun Guo wrote:
>>>> On 2015/3/5 6:46, Rafael J. Wysocki wrote:
>>>>> IMO, you really need to define phys_cpuid_t in a common place or people will
>>>>> forget that it may be 64-bit, because they'll only be looking at their arch.
>>>> Since x86 and ARM64 are using different types for phys_cpuid_t, we need to
>>>> introduce something like following if define it in common place:
>>>>
>>>> in linux/acpi.h,
>>>>
>>>> #if defined(CONFIG_X86) || defined(CONFIG_IA64)
>>>> typedef u32 phys_cpuid_t;
>>>> #define PHYS_CPUID_INVALID (phys_cpuid_t)(-1)
>>>> #else if defined(CONFIG_ARM64)
>>>> typedef u64 phys_cpuid_t;
>>>> #define PHYS_CPUID_INVALID INVALID_HWID
>>>> #endif
>>>>
>>>> I think it's awful, did I miss something?
>> Well, you can define the type and PHYS_CPUID_INVALID in the arch
>> code and then do this in a common header:
>>
>> #ifndef PHYS_CPUID_INVALID
>> typedef u32 phys_cpuid_t;
>> #define PHYS_CPUID_INVALID (phys_cpuid_t)(-1)
>> #endif
>>
>> That would allow you to avoid the need to duplicate the
>> definitions where it is not necessary.
> It's fine by me.

I will update the patch.

Thanks
Hanjun

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