linux-kernel - Re: [PATCH v2 7/7] ACPI / processor: Introduce invalid_phys

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <5549948B.7030504@linaro.org>
Date:	Wed, 06 May 2015 12:11:55 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Sudeep Holla <sudeep.holla@....com>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <Will.Deacon@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>
Subject: Re: [PATCH v2 7/7] ACPI / processor: Introduce invalid_phys_cpuid()

On 2015年05月05日 19:25, Sudeep Holla wrote:
>
>
> On 05/05/15 03:46, Hanjun Guo wrote:
>> Introduce invalid_phys_cpuid() to identify cpu with invalid
>> physical ID, then used it as replacement of the direct comparisons
>> with PHYS_CPUID_INVALID.
>>
>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
>> ---
>>   drivers/acpi/acpi_processor.c | 4 ++--
>>   drivers/acpi/processor_core.c | 4 ++--
>>   include/linux/acpi.h          | 5 +++++
>>   3 files changed, 9 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/acpi/acpi_processor.c
>> b/drivers/acpi/acpi_processor.c
>> index 62c846b..92a5f73 100644
>> --- a/drivers/acpi/acpi_processor.c
>
> [...]
>
>> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
>> index 913b49f..cc82ff3 100644
>> --- a/include/linux/acpi.h
>> +++ b/include/linux/acpi.h
>> @@ -163,6 +163,11 @@ static inline bool invalid_logical_cpuid(u32 cpuid)
>>       return (int)cpuid < 0;
>>   }
>>
>> +static inline bool invalid_phys_cpuid(phys_cpuid_t phys_id)
>> +{
>> +    return (int)phys_id < 0;
>
> Should this be phys_id == PHYS_CPUID_INVALID ? else I don't see why we
> need to even define PHYS_CPUID_INVALID

Oh, we need PHYS_CPUID_INVALID because we defined

+#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, as it is needed
for phys_cpuid_t for ARM64. this is already discussed
here:

https://lkml.org/lkml/2015/3/30/311

Thanks
Hanjun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/