linux-kernel - [PATCH 1/3] objtool/x86: Remove 0xea hack

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Message-ID: <20250924134643.907226869@infradead.org>
Date: Wed, 24 Sep 2025 15:45:08 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: jpoimboe@...nel.org,
 x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
 peterz@...radead.org,
 alexandre.chartre@...cle.com
Subject: [PATCH 1/3] objtool/x86: Remove 0xea hack

Was properly fixed in the decoder with commit 4b626015e1bf ("x86/insn:
Stop decoding i64 instructions in x86-64 mode at opcode")

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 tools/objtool/arch/x86/decode.c |    9 ---------
 1 file changed, 9 deletions(-)

--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -189,15 +189,6 @@ int arch_decode_instruction(struct objto
 	op2 = ins.opcode.bytes[1];
 	op3 = ins.opcode.bytes[2];
 
-	/*
-	 * XXX hack, decoder is buggered and thinks 0xea is 7 bytes long.
-	 */
-	if (op1 == 0xea) {
-		insn->len = 1;
-		insn->type = INSN_BUG;
-		return 0;
-	}
-
 	if (ins.rex_prefix.nbytes) {
 		rex = ins.rex_prefix.bytes[0];
 		rex_w = X86_REX_W(rex) >> 3;