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 X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A284DC433DF for ; Mon, 12 Oct 2020 08:31:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1A57D2145D for ; Mon, 12 Oct 2020 08:31:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602491491; bh=S0GqfGRh8/Tl7HdVRLMI52r7qak2HNoCB3IVK6Zs4T4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=HIXRTYrknP38OpUSv5QKQQqomybMOBV6doa2KUqdY0bidOa9GssX5HlXPCaAu/rXE xRpY8Y1gizwS+GemcDn1hlxbEm9adhinonj7d/IaC2avCCzc3k/dg7ZO9M3/M2pq9y JlI6HTwg3nDFDPT08lnGSzAQy8ZVeoQB3IgAsC0g= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726658AbgJLIba (ORCPT ); Mon, 12 Oct 2020 04:31:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:56330 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726335AbgJLIba (ORCPT ); Mon, 12 Oct 2020 04:31:30 -0400 Received: from willie-the-truck (unknown [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E228120714; Mon, 12 Oct 2020 08:31:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602491487; bh=S0GqfGRh8/Tl7HdVRLMI52r7qak2HNoCB3IVK6Zs4T4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=FAGXtskDnU07QyUMOPdISrDHNwNMMZNEFc9kmIocOb5BS1ggUldHn150u5QE6XaTM TVeCby8WdrzZLI+/xIob9CoWuJsvJlykjpSdQ3zHOkkoakk83y4AGlrSMjgHyLWypR gQcCEbKimhtCql8PcZKHCdCEuxPXmulvNhE+OJes= Date: Mon, 12 Oct 2020 09:31:16 +0100 From: Will Deacon To: Sami Tolvanen Cc: Masahiro Yamada , Steven Rostedt , Peter Zijlstra , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH v5 25/29] arm64: allow LTO_CLANG and THINLTO to be selected Message-ID: <20201012083116.GA785@willie-the-truck> References: <20201009161338.657380-1-samitolvanen@google.com> <20201009161338.657380-26-samitolvanen@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201009161338.657380-26-samitolvanen@google.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Fri, Oct 09, 2020 at 09:13:34AM -0700, Sami Tolvanen wrote: > Allow CONFIG_LTO_CLANG and CONFIG_THINLTO to be enabled. > > Signed-off-by: Sami Tolvanen > Reviewed-by: Kees Cook > --- > arch/arm64/Kconfig | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index ad522b021f35..7016d193864f 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -72,6 +72,8 @@ config ARM64 > select ARCH_USE_SYM_ANNOTATIONS > select ARCH_SUPPORTS_MEMORY_FAILURE > select ARCH_SUPPORTS_SHADOW_CALL_STACK if CC_HAVE_SHADOW_CALL_STACK > + select ARCH_SUPPORTS_LTO_CLANG > + select ARCH_SUPPORTS_THINLTO Please don't enable this for arm64 until we have the dependency stuff sorted out. I posted patches [1] for this before, but I think they should be part of this series as they don't make sense on their own. Will [1] https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=rwonce/read-barrier-depends