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=-17.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL 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 574F3C433DF for ; Wed, 24 Jun 2020 20:33:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3925F2080C for ; Wed, 24 Jun 2020 20:33:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="qDi1kJQp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2406628AbgFXUdp (ORCPT ); Wed, 24 Jun 2020 16:33:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50690 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406611AbgFXUdj (ORCPT ); Wed, 24 Jun 2020 16:33:39 -0400 Received: from mail-qv1-xf49.google.com (mail-qv1-xf49.google.com [IPv6:2607:f8b0:4864:20::f49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C65DCC061799 for ; Wed, 24 Jun 2020 13:33:38 -0700 (PDT) Received: by mail-qv1-xf49.google.com with SMTP id r19so2352661qvz.7 for ; Wed, 24 Jun 2020 13:33:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=tvg1Fbryi0kMABLSJZV+2LlG9cMfXZohRvKr2b10/ew=; b=qDi1kJQp6Ay8PowzBhvgcAgfJKyEY22DJ3SehuRqjn/jA9tuCP3XgBFwyavVII/8H8 +qDUOb2y6OKXwsbI5cxksI3QZk1MHXAA03OHDhdjTbrRcF9EMaP1PLIUJPhY0/usboE5 WysdzKDHLGBWRBK078rHZqlAErXt2qVt2sq358db2q+vTaEhfb2Ztz8s+Npc56SUR/GU zam+aC0Fi9TXcLLkm/vCwtmB9CZFKkHlUgIzUuWu5eMrmtKdAXKTOQSgFxHw8mPgwD7i VrVAm6xkIce/iluM0BjvQMvc/W7Io0XF/CLOQ/Xz7mhbTAKzZSonAVtghl5cbcwT3k0W qRXw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=tvg1Fbryi0kMABLSJZV+2LlG9cMfXZohRvKr2b10/ew=; b=KGDYj7rnL8tiRx4vx1NwY21mBN3FM6BGyKJA1yMvLbNm4lIUlLw9YzsfcervjZoM+h kaggur5NcSo5TP5tx0YzuFzM4T9WabW/x/pkPeXoK6Het9HwkTZ2hx9BgUkPGk3C2toY s2LbX2tu0uNOsR33tACPACsu3xrEXkSsM37+4QD4/QGJTWvSomqpD3diIN4RDh9dLGu3 fUN7WVsdjPqiSrNYyh9tHpt3GNL7i5kin7gQrTPzweD47PHi+WN8o79snoxUgHEWXNf5 B+NiI7VEqyIDtIbqvgiON5qenqz0PKyGwWQLAnL5a/GAhTrKdH/KwxhbULP3Wxv7sexO dokg== X-Gm-Message-State: AOAM533V5IoW4mAUrEUMjpwTslWS+1oh1BuoE9PkoFGNpPx8u1P9yRjV gWxB4abEjMcOmCDc/VQFVE3pU/VFaO3eD7X/dBE= X-Google-Smtp-Source: ABdhPJyl5JOyQAzphL8fSerF19PzJDrN7smlmqxmskm8wB3636prwAzfuisg2Ek7D9XrgzzDEO8QBVxE0nwET9TpJnI= X-Received: by 2002:a05:6214:846:: with SMTP id dg6mr31350632qvb.210.1593030818021; Wed, 24 Jun 2020 13:33:38 -0700 (PDT) Date: Wed, 24 Jun 2020 13:32:00 -0700 In-Reply-To: <20200624203200.78870-1-samitolvanen@google.com> Message-Id: <20200624203200.78870-23-samitolvanen@google.com> Mime-Version: 1.0 References: <20200624203200.78870-1-samitolvanen@google.com> X-Mailer: git-send-email 2.27.0.212.ge8ba1cc988-goog Subject: [PATCH 22/22] x86, build: allow LTO_CLANG and THINLTO to be selected From: Sami Tolvanen To: Masahiro Yamada , Will Deacon Cc: 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, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Allow CONFIG_LTO_CLANG and CONFIG_THINLTO to be enabled. Signed-off-by: Sami Tolvanen --- arch/x86/Kconfig | 2 ++ arch/x86/Makefile | 5 +++++ 2 files changed, 7 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 6a0cc524882d..df335b1f9c31 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -92,6 +92,8 @@ config X86 select ARCH_SUPPORTS_ACPI select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 + select ARCH_SUPPORTS_LTO_CLANG if X86_64 + select ARCH_SUPPORTS_THINLTO if X86_64 select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_QUEUED_RWLOCKS select ARCH_USE_QUEUED_SPINLOCKS diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 00e378de8bc0..a1abc1e081ad 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -188,6 +188,11 @@ ifdef CONFIG_X86_64 KBUILD_LDFLAGS += $(call ld-option, -z max-page-size=0x200000) endif +ifdef CONFIG_LTO_CLANG +KBUILD_LDFLAGS += -plugin-opt=-code-model=kernel \ + -plugin-opt=-stack-alignment=$(if $(CONFIG_X86_32),4,8) +endif + # Workaround for a gcc prelease that unfortunately was shipped in a suse release KBUILD_CFLAGS += -Wno-sign-compare # -- 2.27.0.212.ge8ba1cc988-goog