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

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Message-ID: <407933ba-536e-490b-a7b3-eb81cb75cd0c@suse.com>
Date: Tue, 14 Oct 2025 16:46:51 +0200
From: Jürgen Groß <jgross@...e.com>
To: Borislav Petkov <bp@...en8.de>
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 14.10.25 16:39, Borislav Petkov wrote:
> 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.

Okay, I'll expand that with the concrete example.


Juergen

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