linux-kernel - Re: [PATCH v3 16/17] driver/edac: enable Hygon support to AMD64 EDAC driver

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Date:   Mon, 13 Aug 2018 12:47:19 -0400
From:   Michael Jin <mikhail.jin@...il.com>
To:     Pu Wen <puwen@...on.cn>
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, thomas.lendacky@....com, bp@...en8.de,
        pbonzini@...hat.com, Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-edac@...r.kernel.org
Subject: Re: [PATCH v3 16/17] driver/edac: enable Hygon support to AMD64 EDAC driver

On Mon, Aug 13, 2018 at 12:17 PM, Pu Wen <puwen@...on.cn> wrote:
> On 2018/8/12 3:56, Michael Jin wrote:
>>
>> On Sat, Aug 11, 2018 at 9:30 AM, Pu Wen <puwen@...on.cn> wrote:
>>>
>>> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
>>> -       if (pvt->fam == 0x17) {
>>> +       if (pvt->fam == 0x17 || pvt->vendor == X86_VENDOR_HYGON) {
>>>                  __f17h_set_scrubval(pvt, scrubval);
>>
>>
>> Separating the vendor check as an "else if (pvt->vendor ==
>> X86_VENDOR_HYGON)" block would make architectural changes (future
>> hygon models, i.e. 19h, 20h, etc) less confusing.
>
>
> Your suggestion is reasonable, but that might make the branch a little
> complicated.If we explicitly testing Hygon family in condition case,
> will that be ok?
> +    if (pvt->fam == 0x17 ||
> +       (pvt->vendor == X86_VENDOR_HYGON && pvt->fam == 0x18))

The condition case for family 18h and vendor Hygon looks better
because it is more clear.

Michael