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

[Josh Poimboeuf <jpoimboe@kernel.org>]

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@kernel.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