linux-kernel - Re: [RFC PATCH 3/3] x86/boot: Use alternatives based selector for 5-level paging constants

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Message-ID: <CAHk-=wj9jR8HVOoEsAppFCGH0BcRCY6CrVNUFpeSswxD3Ho67Q@mail.gmail.com>
Date: Tue, 6 May 2025 11:39:02 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: Ard Biesheuvel <ardb+git@...gle.com>, linux-kernel@...r.kernel.org, x86@...nel.org, 
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFC PATCH 3/3] x86/boot: Use alternatives based selector for
 5-level paging constants

On Tue, 6 May 2025 at 11:17, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> The early boot alternatives code fixup should be really easy - no need
> to worry about IPIs and things like that.

Actually, we already run the alternatives fixup before smp, so I guess
we already do that.

But I think we could fairly easily add another section for early boot
alternatives and just use the existing apply_alternatives() for this,
and run it long before arch_cpu_finalize_init().

No?

              Linus