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

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Message-ID: <20231012081631.GJ6307@noisy.programming.kicks-ass.net>
Date:   Thu, 12 Oct 2023 10:16:31 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     Borislav Petkov <bp@...en8.de>,
        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 07:27:58PM -0700, Josh Poimboeuf wrote:
> From an object code standpoint, objtool is the only one who cares about
> the relocs.  It's a good idea to make objtool more robust against
> non-relocs regardless, as the reloc assumption could always be broken
> later by LTO.

AFAIK LTO runs before the actual link stage and doesn't resolve
inter-section references, but yeah, that might just be an implementation
detail.

Fair enough.