linux-kernel - Re: [PATCH v2 21/22] arm64: cpuinfo: Expose MIDR_EL1 and REVIDR

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Message-ID: <CAPvkgC3gcS+Hpp28-dxTZLEcYbhethfYAtsQ5p1Fmb1WZw6Yrw@mail.gmail.com>
Date:	Tue, 6 Oct 2015 11:29:34 +0100
From:	Steve Capper <steve.capper@...aro.org>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	"Suzuki K. Poulose" <suzuki.poulose@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, Vladimir.Murzin@....com,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Edward Nevill <edward.nevill@...aro.org>, aph@...hat.com,
	james.morse@....com, Andre Przywara <andre.przywara@....com>,
	dave.martin@....com
Subject: Re: [PATCH v2 21/22] arm64: cpuinfo: Expose MIDR_EL1 and REVIDR_EL1
 to sysfs

On 6 October 2015 at 11:25, Mark Rutland <mark.rutland@....com> wrote:
> On Tue, Oct 06, 2015 at 11:18:42AM +0100, Steve Capper wrote:
>> On 6 October 2015 at 10:09, Russell King - ARM Linux
>> <linux@....linux.org.uk> wrote:
>> > On Mon, Oct 05, 2015 at 06:02:10PM +0100, Suzuki K. Poulose wrote:
>> >> +static int __init cpuinfo_regs_init(void)
>> >> +{
>> >> +     int cpu, ret;
>> >> +
>> >> +     for_each_present_cpu(cpu) {
>> >> +             struct device *dev = get_cpu_device(cpu);
>> >> +
>> >> +             if (!dev)
>> >> +                     return -1;
>> >
>> > NAK.  Go figure out why, I'm too lazy to tell you.
>>
>> I will correct the return code to be -ENODEV.
>> Was that the reasoning behind the NAK?
>
> I suspect the half-initialised sysfs groups also have something to do
> with it...

Okay, cheers Mark, I see what you mean.

>
> Mark.
>
>>
>> >
>> >> +
>> >> +             ret = sysfs_create_group(&dev->kobj, &cpuregs_attr_group);
>> >> +             if (ret)
>> >> +                     return ret;
>> >> +     }
>> >> +
>> >> +     return 0;
>> >> +}
>> >> +
>> >> +device_initcall(cpuinfo_regs_init);
>> >> --
>> >> 1.7.9.5
>>
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