[PATCH 10/14] objtool: Ignore jumps to the end of the function for non-CFG arches
From: Josh Poimboeuf <jpoimboe@kernel.org>
Date: 2026-03-05 03:31:56
Also in:
live-patching, lkml
Subsystem:
objtool, the rest · Maintainers:
Josh Poimboeuf, Peter Zijlstra, Linus Torvalds
Sometimes Clang arm64 code jumps to the end of the function for UB. No need to make that an error, arm64 doesn't reverse engineer the CFG anyway. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> --- tools/objtool/check.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index f73cf1382e5c..23cde2de66b9 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c@@ -1630,10 +1630,12 @@ static int add_jump_destinations(struct objtool_file *file) /* * GCOV/KCOV dead code can jump to the end of * the function/section. + * + * Clang on arm64 also does this sometimes for + * undefined behavior. */ - if (file->ignore_unreachables && func && - dest_sec == insn->sec && - dest_off == func->offset + func->len) + if ((file->ignore_unreachables || (!opts.stackval && !opts.orc)) && + func && dest_sec == insn->sec && dest_off == func->offset + func->len) continue; ERROR_INSN(insn, "can't find jump dest instruction at %s",
--
2.53.0