linux-kernel - Re: [RFC/RFT PATCH 01/19] x86/idt: Move idt_table to __ro_after

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Message-ID: <20260122135831.GCaXItB6KFO_HRqGcD@fat_crate.local>
Date: Thu, 22 Jan 2026 14:58:31 +0100
From: Borislav Petkov <bp@...en8.de>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, Kees Cook <kees@...nel.org>,
	Uros Bizjak <ubizjak@...il.com>, Brian Gerst <brgerst@...il.com>,
	linux-hardening@...r.kernel.org
Subject: Re: [RFC/RFT PATCH 01/19] x86/idt: Move idt_table to __ro_after_init
 section

On Thu, Jan 22, 2026 at 02:48:14PM +0100, Ard Biesheuvel wrote:
> That is because the init region is between .data and .bss, which are
> not 2M aligned, and so freeing/remapping the init region breaks the
> hugepage mapping of the region between them. This is addressed in
> patch #3.

Ok, I'll continue looking but this commit message should not mislead in
stating that it prevents the "breaking up large page mappings." I'll fix it up
if I end up picking up this or you fix it up in your next revision please.

Thx.

-- 
Regards/Gruss,
    Boris.

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