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Date:   Mon, 30 Nov 2020 15:02:24 +0100
From:   Borislav Petkov <bp@alien8.de>
To:     Punit Agrawal <punitagrawal@gmail.com>
Cc:     rjw@rjwysocki.net, wei.huang2@amd.com,
        linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
        x86@kernel.org, Tom Lendacky <thomas.lendacky@amd.com>,
        Yazen Ghannam <yazen.ghannam@amd.com>
Subject: Re: [RFC PATCH 4/4] cpufreq: acpi-cpufreq: Use identifiers for AMD
 processor family
Message-ID: <20201130140224.GD6019@zn.tnic>
References: <20201125144847.3920-1-punitagrawal@gmail.com>
 <20201125144847.3920-5-punitagrawal@gmail.com>
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In-Reply-To: <20201125144847.3920-5-punitagrawal@gmail.com>
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On Wed, Nov 25, 2020 at 11:48:47PM +0900, Punit Agrawal wrote:
> Replace the raw values for AMD processor family with recently
> introduced identifier macros to improve code readability and
> maintainability.
> 
> Signed-off-by: Punit Agrawal <punitagrawal@gmail.com>
> ---
>  drivers/cpufreq/acpi-cpufreq.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
> index 29f1cd93541e..d8b8300ae9e0 100644
> --- a/drivers/cpufreq/acpi-cpufreq.c
> +++ b/drivers/cpufreq/acpi-cpufreq.c
> @@ -202,8 +202,8 @@ static int override_acpi_psd(unsigned int cpu_id)
>  		 * CPU's before Zen3 (except some Zen2) need the
>  		 * override.
>  		 */
> -		return (c->x86 < 0x19) &&
> -			!(c->x86 == 0x17 && c->x86_model == 0x60 &&
> +		return (c->x86 < AMD_FAM_ZEN3) &&
> +			!(c->x86 == AMD_FAM_ZEN && c->x86_model == 0x60 &&

This is what I mean - that's Zen2 as the comment above says so having

		c->x86 == AMD_FAM_ZEN

is not enough. And you have a comment above it stating which CPUs are
matched here so I'm not sure those family defines make it any better...

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette