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@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/ce841269e7e28c8b7f32064464a9821034d724ff.1744095216.git.jpoimboe@kernel.org

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 2c703b960420a456cce45acfa33ef3298c62fae2..2dd89b0f4d5eb09211b2ebf18bcf5bbda71d83f7 100644 (file)
--- 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;