linux-kernel - Re: [PATCH] x86: Prefer MWAIT over HALT on AMD processors

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Message-ID: <YkxNFyXqC12nXyfM@hirez.programming.kicks-ass.net>
Date:   Tue, 5 Apr 2022 16:07:19 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Wyes Karny <wyes.karny@....com>
Cc:     linux-kernel@...r.kernel.org, Lewis.Carroll@....com,
        Mario.Limonciello@....com, gautham.shenoy@....com,
        Ananth.Narayan@....com, bharata@....com, len.brown@...el.com,
        x86@...nel.org, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com,
        chang.seok.bae@...el.com, keescook@...omium.org, metze@...ba.org,
        zhengqi.arch@...edance.com, mark.rutland@....com
Subject: Re: [PATCH] x86: Prefer MWAIT over HALT on AMD processors

On Tue, Apr 05, 2022 at 06:30:21PM +0530, Wyes Karny wrote:
> +static inline bool early_mwait_supported(const struct cpuinfo_x86 *c)
> +{
> +	if (c->x86_vendor == X86_VENDOR_INTEL)
> +		return true;
> +
> +	if (c->x86_vendor == X86_VENDOR_AMD && cpu_has(c, X86_FEATURE_ZEN))

What about Hygon? For some reason you guys don't co-ordinate and we end
up getting endless 'make-same' patches, sometimes separated by years :/

> +		return true;
> +
> +	return false;
> +}