linux-kernel - Re: [tip: x86/core] x86/alternative: Patch a single alternative location only once

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Message-ID: <20251014143910.GHaO5gjk3IRSLRwqhY@fat_crate.local>
Date: Tue, 14 Oct 2025 16:39:10 +0200
From: Borislav Petkov <bp@...en8.de>
To: Jürgen Groß <jgross@...e.com>
Cc: linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org
Subject: Re: [tip: x86/core] x86/alternative: Patch a single alternative
 location only once

On Tue, Oct 14, 2025 at 04:31:31PM +0200, Jürgen Groß wrote:
> I have this here in the commit message:
> 
>   - In case of replacing an indirect with a direct call using the
>     ALT_FLAG_DIRECT_CALL flag, there is no longer the need to have that
>     instance before any other instances at the same location (the
>     original instruction is needed for finding the target of the direct
>     call).
> 
> which is explaining why the problem is occurring. Isn't that enough?

I can guess what this is about but a concrete example here would make it
a lot clearer, I'd say.

Thx.

-- 
Regards/Gruss,
    Boris.

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