linux-kernel - [PATCH 36/41] x86/alternatives: Remove the mixed-patching restriction on text_poke

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Message-ID: <20250327205355.378659-37-mingo@kernel.org>
Date: Thu, 27 Mar 2025 21:53:49 +0100
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Juergen Gross <jgross@...e.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 36/41] x86/alternatives: Remove the mixed-patching restriction on text_poke_int3()

At this point text_poke_int3(addr, opcode, len, emulate) is equivalent to:

	text_poke_int3_queue(addr, opcode, len, emulate);
	text_poke_int3_finish();

So remove the restriction on mixing single-instruction patching
with multi-instruction patching.

Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/alternative.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index e1cc3e109feb..2807d35c7676 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -2893,9 +2893,6 @@ void __ref text_poke_int3_queue(void *addr, const void *opcode, size_t len, cons
  */
 void __ref text_poke_int3(void *addr, const void *opcode, size_t len, const void *emulate)
 {
-	/* Batch-patching should not be mixed with single-patching: */
-	WARN_ON_ONCE(tp_array.nr_entries != 0);
-
 	text_poke_int3_loc_add(addr, opcode, len, emulate);
 
 	text_poke_int3_finish();
-- 
2.45.2