Message ID | 20201009161338.657380-29-samitolvanen@google.com |
---|---|
State | New |
Headers | show
Return-Path: <linux-pci-owner@vger.kernel.org> X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=<UNKNOWN>) Authentication-Results: ozlabs.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20161025 header.b=RzNTfPVY; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4C7Cpg0ZG1z9sV0 for <incoming@patchwork.ozlabs.org>; Sat, 10 Oct 2020 03:15:23 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389869AbgJIQPN (ORCPT <rfc822;incoming@patchwork.ozlabs.org>); Fri, 9 Oct 2020 12:15:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41544 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389868AbgJIQPL (ORCPT <rfc822;linux-pci@vger.kernel.org>); Fri, 9 Oct 2020 12:15:11 -0400 Received: from mail-pf1-x449.google.com (mail-pf1-x449.google.com [IPv6:2607:f8b0:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8AD9CC0610D0 for <linux-pci@vger.kernel.org>; Fri, 9 Oct 2020 09:14:36 -0700 (PDT) Received: by mail-pf1-x449.google.com with SMTP id 135so7120070pfu.9 for <linux-pci@vger.kernel.org>; Fri, 09 Oct 2020 09:14:36 -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=s78GraQfKANUm9dTCmVzo29Dpzl6ui3oK0KuklmHT+M=; b=RzNTfPVYG6SI0avI+P425NcI9i8AuKh/Cl957fx8fHhzs5RqhtvTqjehKiJwWbgXzy Ut5C1DcliLqQ7eBHuYD2eARb+htm8HZMRcdjOvp9NNGn4mNvqg0iBQ6KDTzK3SzCI/Ck ew2832EE5/Csfrndf18x6wLZPdWlZEhk4iKRPcQGgrfXg3mRAuukQoAwCHLabR1+4M6g meKHJ7cZKth80rKvdaInliqwayqLZinRcdmYOes8g6yEPhfbWOeJqmCgiqX18se7Af/K ryRm6EO2IXl5IsWLnIm6FiXwA7s8mJObCejAMbR/yt+sefiZYk3GwsKgwR63hHzTDcIK szJw== 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=s78GraQfKANUm9dTCmVzo29Dpzl6ui3oK0KuklmHT+M=; b=VGbEuvOhTKshosY7cjhRfs6vgl4Buj2eQndkx5ZHJ1yFnzgeAk27SaV8uRNvdXp2SN mWKuyqSoI67uRl7COTeG/gnIeXV+ts+zzOaWQwO2Fz4D/QJXcxKdTBBpMGnCC2ef1Cl2 Nv3mRALLkuZCApR71EdHUk+BZMo1qYq99bY9yF94oPREDTgf2S7YIG0BP7RTUE9r1l9H IdQM+oNxtqS8JkcNoKRoPT742DGED8f1HWLlJfCTQaWtLOcFM5QQXtyKJbQtDk9TOVet hSuLA0TI/ak2B5IwFsycjckfIrPldMdC+WzaS/7I3M7RG2TBxt0xOecfCgU5kF4ayjOg ZuJA== X-Gm-Message-State: AOAM533ZjeLrl5p5Hisg6yi8Ymu2gzilm0RTzwGNiec5xiZJhVCVLg6B YlKSXpDIxwiyipfAjrBP3EVZvcyJ6v5jZTHGB3Y= X-Google-Smtp-Source: ABdhPJwN3bIx6ear1i57RoG4zimPIt9+fBvTb2OARJUm8GO/EtKrElZNowbDc+vg8xMIIlLqC25fSoWhS1nT0X0YRr4= Sender: "samitolvanen via sendgmr" <samitolvanen@samitolvanen1.mtv.corp.google.com> X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a63:c017:: with SMTP id h23mr760549pgg.420.1602260076066; Fri, 09 Oct 2020 09:14:36 -0700 (PDT) Date: Fri, 9 Oct 2020 09:13:37 -0700 In-Reply-To: <20201009161338.657380-1-samitolvanen@google.com> Message-Id: <20201009161338.657380-29-samitolvanen@google.com> Mime-Version: 1.0 References: <20201009161338.657380-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v5 28/29] x86, cpu: disable LTO for cpu.c From: Sami Tolvanen <samitolvanen@google.com> To: Masahiro Yamada <masahiroy@kernel.org>, Will Deacon <will@kernel.org>, Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "Paul E. McKenney" <paulmck@kernel.org>, Kees Cook <keescook@chromium.org>, Nick Desaulniers <ndesaulniers@google.com>, 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 <samitolvanen@google.com> Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: <linux-pci.vger.kernel.org> X-Mailing-List: linux-pci@vger.kernel.org |
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Add support for Clang LTO
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diff --git a/arch/x86/power/Makefile b/arch/x86/power/Makefile index 6907b523e856..5f711a441623 100644 --- a/arch/x86/power/Makefile +++ b/arch/x86/power/Makefile @@ -5,5 +5,9 @@ OBJECT_FILES_NON_STANDARD_hibernate_asm_$(BITS).o := y # itself be stack-protected CFLAGS_cpu.o := -fno-stack-protector +# Clang may incorrectly inline functions with stack protector enabled into +# __restore_processor_state(): https://bugs.llvm.org/show_bug.cgi?id=47479 +CFLAGS_REMOVE_cpu.o := $(CC_FLAGS_LTO) + obj-$(CONFIG_PM_SLEEP) += cpu.o obj-$(CONFIG_HIBERNATION) += hibernate_$(BITS).o hibernate_asm_$(BITS).o hibernate.o
Clang incorrectly inlines functions with differing stack protector attributes, which breaks __restore_processor_state() that relies on stack protector being disabled. This change disables LTO for cpu.c to work aroung the bug. Link: https://bugs.llvm.org/show_bug.cgi?id=47479 Suggested-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Sami Tolvanen <samitolvanen@google.com> --- arch/x86/power/Makefile | 4 ++++ 1 file changed, 4 insertions(+)