linux-kernel - Re: [PATCH v5 0/5] x86/cpufeatures: Automatically generate required and disabled feature masks

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Message-ID: <20250225181551.GDZ74I1we9xqM_oj-b@fat_crate.local>
Date: Tue, 25 Feb 2025 19:15:51 +0100
From: Borislav Petkov <bp@...en8.de>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Nikolay Borisov <nik.borisov@...e.com>, Xin Li <xin@...or.com>,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
	x86@...nel.org, will@...nel.org, peterz@...radead.org,
	yury.norov@...il.com, akpm@...ux-foundation.org, acme@...nel.org,
	namhyung@...nel.org, brgerst@...il.com, andrew.cooper3@...rix.com
Subject: Re: [PATCH v5 0/5] x86/cpufeatures: Automatically generate required
 and disabled feature masks

On Tue, Feb 25, 2025 at 10:10:03AM -0800, H. Peter Anvin wrote:
> Yeah we had that debate back and forth. Although I personally feel that any
> sensible build host would have or be able to have Perl, the consensus
> opinion seems to be that if it can be done with POSIX standard tools or
> host-side C it should be unless there is a very strong justification to the
> contrary. 

Right, Xin, please make sure you put this rationale in the commit message so
that people can read it.

> I guess at some point that will add host-side Rust, which will be fun since
> that adds the whole Rust user space runtime.

There's that too. And that'll be even more fun. I can't wait for the
compiler-specific workarounds. We're having a lot of fun with two C compilers
already but who says we can't have more?!

/facepalm.

-- 
Regards/Gruss,
    Boris.

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