From mboxrd@z Thu Jan  1 00:00:00 1970
From: guohanjun@huawei.com (Hanjun Guo)
Date: Tue, 31 Mar 2015 09:49:42 +0800
Subject: [patch v11 13/23] ACPI / processor: Introduce phys_cpuid_t for
 CPU hardware ID
In-Reply-To: <20150330135810.GC5964@e104818-lin.cambridge.arm.com>
References: <1427205776-5060-1-git-send-email-hanjun.guo@linaro.org>
 <1427205776-5060-14-git-send-email-hanjun.guo@linaro.org>
 <20150325172109.GJ14585@localhost> <551381CD.5010804@huawei.com>
 <55155DCA.3060006@linaro.org>
 <20150330135810.GC5964@e104818-lin.cambridge.arm.com>
Message-ID: <5519FD36.2080901@huawei.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On 2015/3/30 21:58, Catalin Marinas wrote:
> On Fri, Mar 27, 2015 at 09:40:26PM +0800, Hanjun Guo wrote:
>> On 2015?03?26? 11:49, Hanjun Guo wrote:
>>> On 2015/3/26 1:21, Catalin Marinas wrote:
>>>> On Tue, Mar 24, 2015 at 10:02:46PM +0800, Hanjun Guo wrote:
>>>>> --- a/drivers/acpi/acpi_processor.c
>>>>> +++ b/drivers/acpi/acpi_processor.c
>>>>> @@ -170,7 +170,7 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr)
>>>>>  	acpi_status status;
>>>>>  	int ret;
>>>>>
>>>>> -	if (pr->phys_id == -1)
>>>>> +	if (pr->phys_id == PHYS_CPUID_INVALID)
>>>>>  		return -ENODEV;
>>>> If PHYS_CPUID_INVALID is the same as INVALID_HWID, we should get rid of
>>>> the latter in the arm64 code (as a subsequent clean-up patch).
>>> OK, I'm preparing a patch set to introduce invalid_phys_cpuid() and invalid_logical_cpuid()
>>> to remove the direct comparison of PHYS_CPUID_INVALID and -1 in ACPI processor drivers,
>>> which is suggested by Rafael, I will cleanup PHYS_CPUID_INVALID in this patch set.
>> I met difficulty to do so, because we use
>>
>> +#ifndef PHYS_CPUID_INVALID
>> +typedef u32 phys_cpuid_t;
>> +#define PHYS_CPUID_INVALID (phys_cpuid_t)(-1)
>> +#endif
>>
>> in the common head file linux/acpi.h, we need macro
>> PHYS_CPUID_INVALID to identify if phys_cpuid_t is typedefed
>> for different arch, so if we want remove PHYS_CPUID_INVALID
>> for ARM64, we need to got back to typedef phys_cpuid_t for
>> each arch using ACPI. which means that
> What I meant was removing INVALID_HWID from arm64 and always use the
> PHYS_CPUID_INVALID but I think we should leave them as they are for now
> since PHYS_CPUID_INVALID is defined in the asm/acpi.h file.

OK, thanks for the clarify.

Hanjun