linux-kernel - Re: [PATCH -v2] x86/retpoline: Ensure default return thunk isn't used at runtime

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Message-ID: <20240403173059.GJZg2SUwS8MXw7CdwF@fat_crate.local>
Date: Wed, 3 Apr 2024 19:30:59 +0200
From: Borislav Petkov <bp@...en8.de>
To: Klara Modin <klarasmodin@...il.com>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>,
	"Kaplan, David" <David.Kaplan@....com>,
	Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tip-commits@...r.kernel.org" <linux-tip-commits@...r.kernel.org>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	"x86@...nel.org" <x86@...nel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH -v2] x86/retpoline: Ensure default return thunk isn't
 used at runtime

On Wed, Apr 03, 2024 at 07:10:17PM +0200, Klara Modin wrote:
> With this patch/commit, one of my machines (older P4 Xeon, 32-bit only)
> hangs on boot with CONFIG_RETHUNK=y / CONFIG_MITIGATION_RETHUNK=y.

I wanna say your old P4 heater :) is not even affected by the crap the
return thunks are trying to address so perhaps we should make
CONFIG_MITIGATION_RETHUNK depend on !X86_32...

-- 
Regards/Gruss,
    Boris.

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