linux-kernel - Re: [PATCH] x86/mm: Ensure clear_page() variants always have __kcfi_typeid

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Message-ID: <20251031142044.GB3022331@ax162>
Date: Fri, 31 Oct 2025 10:20:44 -0400
From: Nathan Chancellor <nathan@...nel.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	Sami Tolvanen <samitolvanen@...gle.com>,
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] x86/mm: Ensure clear_page() variants always have
 __kcfi_typeid_ symbols

Hey Boris,

On Thu, Oct 30, 2025 at 08:28:19PM +0100, Borislav Petkov wrote:
> On Mon, Oct 13, 2025 at 02:27:36PM -0700, Nathan Chancellor wrote:
> > When building with CONFIG_CFI=y and CONFIG_LTO_CLANG_FULL=y, there is a
> > series of errors from the various versions of clear_page() not having
> > __kcfi_typeid_ symbols.
> 
> might wanna wait with this one - those are going away except one:
> 
> https://lore.kernel.org/r/20251027202109.678022-5-ankur.a.arora@oracle.com

These errors occur in Linus's tree so could this go before that one then
it could just update the instances of KCFI_ADDRESSABLE? I don't have a
strong opinion, I found these series of errors tangentially but this
feels like something that could go via x86/urgent and that series could
just rebase on it.

Cheers,
Nathan