linux-kernel - [PATCH v4 3/4] objtool: Stop UNRET validation on UD2

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Message-ID: <ce841269e7e28c8b7f32064464a9821034d724ff.1744095216.git.jpoimboe@kernel.org>
Date: Tue,  8 Apr 2025 00:02:15 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Juergen Gross <jgross@...e.com>
Subject: [PATCH v4 3/4] objtool: Stop UNRET validation on UD2

In preparation for simplifying INSN_SYSCALL, make validate_unret()
terminate control flow on UD2 just like validate_branch() already does.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 tools/objtool/check.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 2c703b960420..2dd89b0f4d5e 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -3902,6 +3902,9 @@ static int validate_unret(struct objtool_file *file, struct instruction *insn)
 			break;
 		}
 
+		if (insn->dead_end)
+			return 0;
+
 		if (!next) {
 			WARN_INSN(insn, "teh end!");
 			return 1;
-- 
2.49.0