linux-kernel - Re: [PATCH 09/11] x86: rework CONFIG_GENERIC

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Message-ID: <Z1GdxrjBpn2Nu1vu@zx2c4.com>
Date: Thu, 5 Dec 2024 13:35:19 +0100
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: Andy Shevchenko <andy@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnd Bergmann <arnd@...nel.org>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matthew Wilcox <willy@...radead.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Davide Ciminaghi <ciminaghi@...dd.com>,
	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	sultan@...neltoast.com
Subject: Re: [PATCH 09/11] x86: rework CONFIG_GENERIC_CPU compiler flags

On Thu, Dec 05, 2024 at 12:58:22PM +0100, Arnd Bergmann wrote:
> As I said earlier, I don't think we should offer the 'native'
> option for 32-bit targets at all. For 64-bit, we either decide
> it's a user error to enable -march=native, or change it to
> -mtune=native to avoid the problem.

I've been building my laptop's kernel with -march=native for years, and
I'd be happy if this capability were upstream.

Jason