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=-20.4 required=3.0 tests=BAYES_00,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 4EB31C43467 for ; Fri, 9 Oct 2020 16:15:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 027162225D for ; Fri, 9 Oct 2020 16:15:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="GrQmnCLF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389832AbgJIQP0 (ORCPT ); Fri, 9 Oct 2020 12:15:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41628 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389841AbgJIQOy (ORCPT ); Fri, 9 Oct 2020 12:14:54 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 511E6C0613AC for ; Fri, 9 Oct 2020 09:14:29 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id f199so9405726yba.12 for ; Fri, 09 Oct 2020 09:14:29 -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=zm1uzmyUH/ec78UqO7SuMlzRHKM3BG4k+fqmwwznAmg=; b=GrQmnCLFUBaiVCsxG+ZjkTiTKAEhcgJzQFl56MgTLq8OusnCa4bNYdjWzig23zPrnl +im7f6+CPpBNHzIFXIJLOZcbW4i0CqLoe8s+12RVeCjtt+HO9D9Fmp+O75+bZf2mDiJ2 /Sdf7HcvK80M7NGzoz4kRytQKC5iEXY2PGakFdQKhcL+z9fCcZ8Ykqq7GsQcpzIDx15k 9etE83hAgqhL7En54OpSg8MznvaXv/L4GRvX1UCC+uCk3jv6tzVeSDQl1PLkAX8W1gfk LEMSPi1GNobCqjW4dHBWslVgjybeY2q8RDcnHKubTb3w6/WlHs1OcJttkCjOO4Qogko1 U5qg== 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=zm1uzmyUH/ec78UqO7SuMlzRHKM3BG4k+fqmwwznAmg=; b=o/gz6dN+Zy3hYG9mxuFoxF6FCkbrk3ODcO5U40QoTdF93TB2ddZlc48zq2wiTqLxCD BasuS3ib0qxgqbsPZnA0aNeWCTbB6Th3HaNjl2MrA4Ay8crtSur3EdQTytTbzvUDqyaH oWqBLo9KMir6whvA8gbuhT55U9X2GWtT7TdmZwtDCt24/DGFontC3TejDMboM8QgTZ00 qXhxUl1wWX+8sNvYCYffSeC6jAgJ7Dt+Es7R5I2x3vDhLTWv618Fz71tMOxY+0n/IbZb SaNGm1C5xh7RtosipprTYspgQZJW1szP7Z3ex/eyEMEu22BcMLxVch50QnoXJIjsY34D mlFQ== X-Gm-Message-State: AOAM533/d50a2skdCuoq5UX24KMawSH0llFBcSkMWWmjBun6WrF0RCCQ z6c/LgwhMsWeFH6B2GxmTzrozNg5Spm+/xlbATk= X-Google-Smtp-Source: ABdhPJxS1cYLvTIq9AbU/WliPWkh+GMQ6EsM5q7afR6k6pEppCcn0hGMMeepAaLb0PMYcn/yVr6LGbihlfCH0HkjlAs= 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:a5b:486:: with SMTP id n6mr9292236ybp.229.1602260068556; Fri, 09 Oct 2020 09:14:28 -0700 (PDT) Date: Fri, 9 Oct 2020 09:13:33 -0700 In-Reply-To: <20201009161338.657380-1-samitolvanen@google.com> Message-Id: <20201009161338.657380-25-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 24/29] arm64: disable recordmcount with DYNAMIC_FTRACE_WITH_REGS From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt Cc: 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, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 6d232837cbee..ad522b021f35 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -155,6 +155,8 @@ 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 -- 2.28.0.1011.ga647a8990f-goog