linux-kernel - Re: [PATCH V3] LoongArch: Fix cpu name after s3/s4

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Date:   Thu, 29 Sep 2022 17:14:21 +0800
From:   Jianmin Lv <lvjianmin@...ngson.cn>
To:     WANG Xuerui <kernel@...0n.name>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev
Subject: Re: [PATCH V3] LoongArch: Fix cpu name after s3/s4



On 2022/9/29 下午5:06, WANG Xuerui wrote:
> On 9/29/22 16:55, Jianmin Lv wrote:
>> On coming back from s3/s4, the cpu name will be overwritten
>> in cpu_probe path of seconary cpu, so we don't overwrite it
>> if it has been initialized.
> 
> The sentences are confusing, first "the CPU name will be overwritten" 
> then "don't overwrite it if initialized" -- seems the CPU name will get 
> overwritten despite the patch's clear intent.
> 
> Better to keep it simple: "Don't overwrite the CPU name on coming back 
> from S3/S4 if it is already initialized."
> 

Thanks, Xuerui, let me change it.

>>
>> Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
>>
>> diff --git a/arch/loongarch/kernel/cpu-probe.c 
>> b/arch/loongarch/kernel/cpu-probe.c
>> index 529ab8f44ec6..255a09876ef2 100644
>> --- a/arch/loongarch/kernel/cpu-probe.c
>> +++ b/arch/loongarch/kernel/cpu-probe.c
>> @@ -187,7 +187,9 @@ static inline void cpu_probe_loongson(struct 
>> cpuinfo_loongarch *c, unsigned int
>>       uint64_t *vendor = (void *)(&cpu_full_name[VENDOR_OFFSET]);
>>       uint64_t *cpuname = (void *)(&cpu_full_name[CPUNAME_OFFSET]);
>> -    __cpu_full_name[cpu] = cpu_full_name;
>> +    if (!__cpu_full_name[cpu])
>> +        __cpu_full_name[cpu] = cpu_full_name;
>> +
>>       *vendor = iocsr_read64(LOONGARCH_IOCSR_VENDOR);
>>       *cpuname = iocsr_read64(LOONGARCH_IOCSR_CPUNAME);
> 
> Otherwise LGTM.
> 
> Reviewed-by: WANG Xuerui <git@...0n.name>
>