linux-kernel - Re: [PATCH 1/3] Revert "x86/retpoline: Remove .text..__x86.return

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Message-ID: <20231011093422.GBZSZsHumBjU6c68Zb@fat_crate.local>
Date:   Wed, 11 Oct 2023 11:34:22 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        David Kaplan <david.kaplan@....com>, x86@...nel.org,
        luto@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] Revert "x86/retpoline: Remove
 .text..__x86.return_thunk section"

On Wed, Oct 11, 2023 at 09:41:42AM +0200, Peter Zijlstra wrote:
> *urgh*... I mean, yes, that obviously works, but should we not also have
> the retpoline thingy for consistency? That case makes less sense though
> :/
> 
> Perhaps warn about this instead of fixing it? Forcing people to play the
> section game?

I like the conservative aspect of that: keep the separate sections and
warn if the return thunk is in the same section.

Thx.

-- 
Regards/Gruss,
    Boris.

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