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=-12.8 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 22BE7C35257 for ; Thu, 3 Sep 2020 20:34:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0306820658 for ; Thu, 3 Sep 2020 20:34:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="W5E0fdTW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729598AbgICUe5 (ORCPT ); Thu, 3 Sep 2020 16:34:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35482 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729582AbgICUc4 (ORCPT ); Thu, 3 Sep 2020 16:32:56 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D04A1C061249 for ; Thu, 3 Sep 2020 13:31:43 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id q2so4059064ybo.5 for ; Thu, 03 Sep 2020 13:31:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=DRdAryjq8aJ9FhWbdHsWSPKN6ISJIFMAFBJf/ilStC4=; b=W5E0fdTWYYpdRgGn3+mM1jE0Lnq94Ez+0wXBu2gCXs/Y+ie/fjFHxxGVxqs4iDjO61 XUhA7AwaMsRFv8vxG+A2l1ssqjpgTZnnYSVjKhst6YSRYn0OJjWUHRfPYs4kigu2qd4P t+7zq62XXAtCsJ6LJcQc5WI8i9ada15PY9rxQyYH3tgvVRCGIgzZ7AaRdUcs3DL9eEcC Mksgubm5f3YT2uHtXKoqiKJVJ82iqcQCdR5AMuaFyYG+/7pg3g10PdXI72qaqm/rzX7U +8H1VOT5Eb3eLUSsSkUJu8s7szptM4G6CN6v7v59SQ2mX07NJ6vsYtwXB5FrSylvGkOB +/fg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=DRdAryjq8aJ9FhWbdHsWSPKN6ISJIFMAFBJf/ilStC4=; b=OjorddnAmZ9MO4gpTZr9vWaYzM/iYJsomqeMVzBEubK+xxiARPOcphYXC5zmcLsIql L/uZtmXQv+N8Q6jYSzP/nyY2WLWlcEbxicmvCsZXcMrMZs2MjQuifBI1uKJvoa5sqZUn FAugH9qBW5BIvGSWoBR7TFcgs+LwAv2RxHOKBp+JWgKjSeTdrtzPDn0+muSahfuLWWIV aKFh+ABwHe/3FZ7aLj1D4Up76+JDI4/t/B7Ky17ZQK1ycEkhLDP+J4rgThDZjSEXZUYV 82OYeJZpkaYcaOdSp+RRfH5trsrcUla6c/YXaED/1heB+ZNrOFbUSNEqhoTa/JUf7qx6 8TfA== X-Gm-Message-State: AOAM5303kc4qxDhCvDaLRcy2waz56emN7C/xF4x5Hsnibxa0KKj+taey +haV2/Q9ENZCMwETWgsdkgx6X9U+TeVqD+2bVxo= X-Google-Smtp-Source: ABdhPJwiTOpKp1DNcc2Niuh9wmKZr2hpSpikSLbkfpniA2lBbifw5OwcLaWnbhau9OTVobvQsgnuxmwxleyw5C1VPmM= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a25:ef07:: with SMTP id g7mr4300288ybd.448.1599165103083; Thu, 03 Sep 2020 13:31:43 -0700 (PDT) Date: Thu, 3 Sep 2020 13:30:48 -0700 In-Reply-To: <20200903203053.3411268-1-samitolvanen@google.com> Message-Id: <20200903203053.3411268-24-samitolvanen@google.com> Mime-Version: 1.0 References: <20200624203200.78870-1-samitolvanen@google.com> <20200903203053.3411268-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.526.ge36021eeef-goog Subject: [PATCH v2 23/28] arm64: vdso: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Will Deacon Cc: Peter Zijlstra , Steven Rostedt , 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 Disable LTO for the vDSO by filtering out CC_FLAGS_LTO, as there's no point in using link-time optimization for the small about of C code. Signed-off-by: Sami Tolvanen --- arch/arm64/kernel/vdso/Makefile | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index 45d5cfe46429..aa47070a3ccf 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -30,8 +30,8 @@ ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \ ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18 ccflags-y += -DDISABLE_BRANCH_PROFILING -CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) -KBUILD_CFLAGS += $(DISABLE_LTO) +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) \ + $(CC_FLAGS_LTO) KASAN_SANITIZE := n UBSAN_SANITIZE := n OBJECT_FILES_NON_STANDARD := y -- 2.28.0.402.g5ffc5be6b7-goog