linux-kernel - RE: [RFC PATCH 20/56] x86/bugs: Move bugs.c logic out of .init section

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Message-ID:
 <DS0PR12MB927341C26CE262CDDDB67EAA94E9A@DS0PR12MB9273.namprd12.prod.outlook.com>
Date: Thu, 16 Oct 2025 13:46:00 +0000
From: "Kaplan, David" <David.Kaplan@....com>
To: Brendan Jackman <jackmanb@...gle.com>, Thomas Gleixner
	<tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>, Peter Zijlstra
	<peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>, Pawan Gupta
	<pawan.kumar.gupta@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>, Dave
 Hansen <dave.hansen@...ux.intel.com>, "x86@...nel.org" <x86@...nel.org>, "H .
 Peter Anvin" <hpa@...or.com>
CC: Alexander Graf <graf@...zon.com>, Boris Ostrovsky
	<boris.ostrovsky@...cle.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH 20/56] x86/bugs: Move bugs.c logic out of .init
 section

[AMD Official Use Only - AMD Internal Distribution Only]

> -----Original Message-----
> From: Brendan Jackman <jackmanb@...gle.com>
> Sent: Thursday, October 16, 2025 7:32 AM
> To: Kaplan, David <David.Kaplan@....com>; Thomas Gleixner
> <tglx@...utronix.de>; Borislav Petkov <bp@...en8.de>; Peter Zijlstra
> <peterz@...radead.org>; Josh Poimboeuf <jpoimboe@...nel.org>; Pawan Gupta
> <pawan.kumar.gupta@...ux.intel.com>; Ingo Molnar <mingo@...hat.com>; Dave
> Hansen <dave.hansen@...ux.intel.com>; x86@...nel.org; H . Peter Anvin
> <hpa@...or.com>
> Cc: Alexander Graf <graf@...zon.com>; Boris Ostrovsky
> <boris.ostrovsky@...cle.com>; linux-kernel@...r.kernel.org
> Subject: Re: [RFC PATCH 20/56] x86/bugs: Move bugs.c logic out of .init section
>
> Caution: This message originated from an External Source. Use proper caution
> when opening attachments, clicking links, or responding.
>
>
> On Mon Oct 13, 2025 at 2:34 PM UTC, David Kaplan wrote:
> > If dynamic mitigations are supported, all the mitigation selection
> > functions and mitigation choices may change at runtime.  Therefore, none of
> > the functions may exist in .init and the data must not be read-only.
>
> I suppose we should have something akin to
> __meminit/__init_or_module/__net_init here (like __init, but conditional
> on Kconfig), so that users with CONFIG_DYNAMIC_MITIGATIONS=n can still
> get the RAM back?

Yeah, that's an option (maybe like __bugs_init).  Initial feedback I got was just to remove them from .init since they're now sometimes used later, but we could create a separate attribute tag.  Similar for the __ro_after_init ones.

Thanks
--David Kaplan