From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9136EFF6E9B for ; Tue, 17 Mar 2026 22:51:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=q0TGxelnSqXBDOM7mYStNCfP3fD2NuOIazgCtMx7pgQ=; b=xt4XhHt8y1TwuMzL2+NVyQRSXV +8kpnlKFEv0c6vg8GpTdZZXDtaYUsJa7ROQm2o1rsyfOe5XUrGP95wDBBW39Vug6vZRrXepBI4A/U JVY5aZv568c3pyAPbbFg6xfDzYPWQcot3Ov4ADvkXOtL02e7o8LktSZdnfVpcECNuKeyOyigfAZam doVQnVrvq1nv7tUrXVYQtxSrSmdPzgY1ddIDAswBzKGU3x8Be+Jq3bhr9/bRFFfc1cSAYnWEOe5yH diX42n0lNRE/0SC9MzvMWv/gbBNdf9lltHXM6dR4TdXo9ufyw3cong5BOWex2iIVKAKBKVW5DnQei 3Ow86xnw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w2dGQ-00000007KdY-2iza; Tue, 17 Mar 2026 22:51:50 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w2dGD-00000007KVd-0dFa for linux-arm-kernel@lists.infradead.org; Tue, 17 Mar 2026 22:51:38 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 0C3D444531; Tue, 17 Mar 2026 22:51:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 75822C4CEF7; Tue, 17 Mar 2026 22:51:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773787896; bh=LneP7wGKv2nwzC48EGP/qa4m/tgR04JXHfdr5Hy2OTI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qngo6z11Y9Ew0q/w6MzKc0RDHuzv3zv3tiXXmAii/TUFdqaHGUiE77fX5laBcACdt jBK8X+ZL41ymUm5gnCm4tvn376vpm2pJcgtRELAmhSl7gdxnxq4PCRwODiMjhPJF1G v+lsWta3aS0+zy/Vopw3VMh0ddnhzp6yeJ+PzrOSY+qjni4yG/YrEVvuDOtJ+dW8dy r61VBS8lpeF0XSxQuuHQiqosUWnGyBNdOpzknYHAkClT4p4QeiMuTGKIU9d4FTkpsF hupC261b4CXaULZAnA5st3TPR4D0WnZ9UJTCcJUVlOth7LoPZ8WTBaUyKZ0pwqTrN5 HyhiNADADG70A== From: Josh Poimboeuf To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, live-patching@vger.kernel.org, Peter Zijlstra , Joe Lawrence , Song Liu , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, Mark Rutland , Nathan Chancellor , Nicolas Schier , Herbert Xu Subject: [PATCH v2 08/12] objtool: Ignore jumps to the end of the function for non-CFG arches Date: Tue, 17 Mar 2026 15:51:08 -0700 Message-ID: X-Mailer: git-send-email 2.53.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260317_155137_217295_D0CDABBA X-CRM114-Status: GOOD ( 13.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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. Acked-by: Song Liu Signed-off-by: Josh Poimboeuf --- 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 d428d63b29c6..6e33a29bd3ed 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