linux-kernel - Re: [PATCH 1/1] arm64: Always provide "model name" in /proc/cpuinfo

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Message-ID: <6a6c78f4-38b9-5da5-2277-9d9212f803bf@jonmasters.org>
Date:   Sat, 6 May 2017 02:57:02 -0400
From:   Jon Masters <jcm@...masters.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Heinrich Schuchardt <xypron.glpk@....de>
Cc:     Will Deacon <will.deacon@....com>,
        Steve Capper <steve.capper@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Andre Przywara <andre.przywara@....com>,
        linux-kernel@...r.kernel.org, Julien Grall <julien.grall@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/1] arm64: Always provide "model name" in /proc/cpuinfo

On 05/02/2017 07:08 AM, Catalin Marinas wrote:
> On Tue, May 02, 2017 at 12:39:13AM +0200, Heinrich Schuchardt wrote:
>> There is no need to hide the model name in processes
>> that are not PER_LINUX32.
>>
>> So let us always provide a model name that is easily readable.
>>
>> Fixes: e47b020a323d ("arm64: Provide "model name" in /proc/cpuinfo for PER_LINUX32 tasks")
>> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
>> ---
>>  arch/arm64/kernel/cpuinfo.c | 5 ++---
>>  1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
>> index b3d5b3e8fbcb..9ad9ddcd2f19 100644
>> --- a/arch/arm64/kernel/cpuinfo.c
>> +++ b/arch/arm64/kernel/cpuinfo.c
>> @@ -118,9 +118,8 @@ static int c_show(struct seq_file *m, void *v)
>>  		 * "processor".  Give glibc what it expects.
>>  		 */
>>  		seq_printf(m, "processor\t: %d\n", i);
>> -		if (compat)
>> -			seq_printf(m, "model name\t: ARMv8 Processor rev %d (%s)\n",
>> -				   MIDR_REVISION(midr), COMPAT_ELF_PLATFORM);
>> +		seq_printf(m, "model name\t: ARMv8 Processor rev %d (%s)\n",
>> +			   MIDR_REVISION(midr), COMPAT_ELF_PLATFORM);
>>  
>>  		seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
>>  			   loops_per_jiffy / (500000UL/HZ),
> 
> Such patch seems to come up regularly:
> 
> https://patchwork.kernel.org/patch/9303311/
> 
> (and it usually gets rejected)

Side note: I'm in the process of reviving a standardization discussion
around server and model information, and we'll be coming back with an
agenda to get this information in /proc/cpuinfo in coming months.

Jon.