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

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Message-ID: <20251119160420.22160-1-jgross@suse.com>
Date: Wed, 19 Nov 2025 17:04:17 +0100
From: Juergen Gross <jgross@...e.com>
To: linux-kernel@...r.kernel.org,
	x86@...nel.org
Cc: Juergen Gross <jgross@...e.com>,
	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: [PATCH v4 0/3] x86/alternative: Patch a single alternative location only once

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(-)

-- 
2.51.0