linux-kernel - Re: [PATCH v4 0/3] x86/alternative: Patch a single alternative location only once

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Message-ID: <bd461faf-65c8-4c13-837d-fedefef588f5@suse.com>
Date: Mon, 15 Dec 2025 09:25:13 +0100
From: Juergen Gross <jgross@...e.com>
To: linux-kernel@...r.kernel.org, x86@...nel.org
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v4 0/3] x86/alternative: Patch a single alternative
 location only once

Ping?

On 19.11.25 17:04, Juergen Gross wrote:
> Instead of patching a single location potentially multiple times in
> case of nested ALTERNATIVE()s, do the patching only after having
> evaluated all alt_instr instances for that location.
> 
> Changes in V2:
> - complete rework (Boris Petkov)
> 
> Changes in V3:
> - split former V2 patch into 2 by introducing a helper function (Boris Petkov)
> - repost the small cleanup patch 1 which was taken before, but has somehow
>    vanished from the tip x86/alternative branch (it is still in the tip
>    master branch, but I couldn't find it in any other tip branch).
> 
> Changes in V4:
> - use 3 helpers instead of 1 (Boris Petkov)
> 
> Juergen Gross (3):
>    x86/alternative: Drop not needed test after call of alt_replace_call()
>    x86/alternative: Use helper functions for patching alternatives
>    x86/alternative: Patch a single alternative location only once
> 
>   arch/x86/kernel/alternative.c | 147 ++++++++++++++++++++--------------
>   1 file changed, 87 insertions(+), 60 deletions(-)
> 


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