[PATCH 16/27] objtool: Detect noreturns in weak functions

[Josh Poimboeuf]

The skipping of weak functions in the noreturn detection logic is a bit
weird, as a function's return/noreturn ABI shouldn't change regardless
of which version gets linked.

Fix that, and update the global noreturns list as needed.

Note that abort() now needs to be added to the list: while objtool on
vmlinux.o can detect that its noreturn, modules have no way of knowing.

Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
---
 tools/objtool/check.c     | 3 ---
 tools/objtool/noreturns.h | 3 +--
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index ddb8dbe7f71d9..c55851ec389cd 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -260,9 +260,6 @@ static bool might_return(struct objtool_file *file, struct symbol *func)
 	struct instruction *insn;
 	struct symbol *dest;
 
-	if (is_weak_sym(func))
-		return true;
-
 	func_for_each_insn(file, func, insn) {
 		if (insn->type == INSN_RETURN)
 			return true;
diff --git a/tools/objtool/noreturns.h b/tools/objtool/noreturns.h
index cd41f580ccb72..26f62f98bc8ef 100644
--- a/tools/objtool/noreturns.h
+++ b/tools/objtool/noreturns.h
@@ -11,15 +11,14 @@ NORETURN(__kunit_abort)
 NORETURN(__module_put_and_kthread_exit)
 NORETURN(__stack_chk_fail)
 NORETURN(__ubsan_handle_builtin_unreachable)
+NORETURN(abort)
 NORETURN(acpi_processor_ffh_play_dead)
 NORETURN(do_exit)
 NORETURN(kthread_complete_and_exit)
 NORETURN(kunit_try_catch_throw)
 NORETURN(mpt_halt_firmware)
-NORETURN(nmi_panic_self_stop)
 NORETURN(panic)
 NORETURN(vpanic)
-NORETURN(panic_smp_self_stop)
 NORETURN(rewind_stack_and_make_dead)
 NORETURN(rust_helper_BUG)
 NORETURN(sev_es_terminate)
-- 
2.55.0