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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 85DDDC8300C for ; Wed, 18 Nov 2020 22:08:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2F76C206CA for ; Wed, 18 Nov 2020 22:08:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Hl0/5xWu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726624AbgKRWIV (ORCPT ); Wed, 18 Nov 2020 17:08:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727554AbgKRWIN (ORCPT ); Wed, 18 Nov 2020 17:08:13 -0500 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 67F1EC061A52 for ; Wed, 18 Nov 2020 14:08:11 -0800 (PST) Received: by mail-qv1-xf49.google.com with SMTP id y8so2489952qvu.22 for ; Wed, 18 Nov 2020 14:08:11 -0800 (PST) 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=C9kRHDqVxMS9meVJm6Hst0wtaqe3NZ38y9krJFbUxhM=; b=Hl0/5xWucUPJ643/PIYI+sdYOG9Js6rvOiCoWjAxZvuk5n0EKu2IQNyuMBh6yuGcq9 GKmyN/Fjv1jDACb/r2eyKCWMiRaP+4jFOJ6W4iVlTT1s5IuE0w5eW1wzTr9z3qGyZB+c 1+Ac3lgon9jRiCkfkxGCRfVfPCkQ6vCnGvL8X0mU+VnbyrvK/6C28dCzTrjfsSmgp5BY 2Jbefx7UjiqpuevCvMPBNA4WlnqB56ySe/GRWbZuQ3g+Xtr0BahoHUIbgF6ovQ/Jl0Ng P8wwQ6WGRG+ElcWU389UI3hoPAsl5dsytrkZXsVBF/3XKPHdZFVmlJ7BHjNcimLrN72n o+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=C9kRHDqVxMS9meVJm6Hst0wtaqe3NZ38y9krJFbUxhM=; b=OAGbBsF5PLRctDX8X4s9UonHelcoX7yvC5x9TmjjRp0E9qhKMcSacYv/LvqHg3UMbm /H+ahFC7AK+J328rqBPqnlxgJtxgbhmGeRz753Os2MXqKd3V1+AHmQCVknQHjyAqFL+b xUuQFQMkImpc4f8oye/dbSPmx2lF4y0K1D3MFBc3wEMSFB4Cea4PkVX/iGKl3hE803zY PkOfji2opvNI030ncce8Dy9GrnWY+RscoY+WxQCMhDvyXeJ1vGtZAj4ZfTjIwSRYbeVd OKXLBUdO43dcSVpxOwPDMD/N4f8SUUZRQs6ybkDZcsUmu0Ez1NkiMPOZJVUSKzJa5NJk ST5g== X-Gm-Message-State: AOAM533a7/0AgkKxUT95SZpmJ2edRumtxlC7231U14d/yZx8fPO+tee+ tH1QzHCkhqVzOXNretRE24HU+iFixSOm/NCUMsg= X-Google-Smtp-Source: ABdhPJypKLtF22I9S60T1xcjNfuT4VKu9ADZC5Cc5ECnuUgqSEfk7aa/seslzQLD9zO17pZOKSThOIghv6j82Kh+Quo= Sender: "samitolvanen via sendgmr" X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:ad4:4e0d:: with SMTP id dl13mr7176727qvb.54.1605737290528; Wed, 18 Nov 2020 14:08:10 -0800 (PST) Date: Wed, 18 Nov 2020 14:07:30 -0800 In-Reply-To: <20201118220731.925424-1-samitolvanen@google.com> Message-Id: <20201118220731.925424-17-samitolvanen@google.com> Mime-Version: 1.0 References: <20201118220731.925424-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.454.gaff20da3a2-goog Subject: [PATCH v7 16/17] arm64: disable recordmcount with DYNAMIC_FTRACE_WITH_REGS From: Sami Tolvanen To: Masahiro Yamada , Steven Rostedt , Will Deacon Cc: Josh Poimboeuf , 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, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org DYNAMIC_FTRACE_WITH_REGS uses -fpatchable-function-entry, which makes running recordmcount unnecessary as there are no mcount calls in object files, and __mcount_loc doesn't need to be generated. While there's normally no harm in running recordmcount even when it's not strictly needed, this won't work with LTO as we have LLVM bitcode instead of ELF objects. This change selects FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY, which disables recordmcount when patchable function entries are used instead. Signed-off-by: Sami Tolvanen --- arch/arm64/Kconfig | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 1515f6f153a0..c7f07978f5b6 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -158,6 +158,8 @@ config ARM64 select HAVE_DYNAMIC_FTRACE select HAVE_DYNAMIC_FTRACE_WITH_REGS \ if $(cc-option,-fpatchable-function-entry=2) + select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY \ + if DYNAMIC_FTRACE_WITH_REGS select HAVE_EFFICIENT_UNALIGNED_ACCESS select HAVE_FAST_GUP select HAVE_FTRACE_MCOUNT_RECORD -- 2.29.2.299.gdc1121823c-goog