From patchwork Fri Dec 11 18:46:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11969333 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 67596C433FE for ; Fri, 11 Dec 2020 20:26:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2395B2074B for ; Fri, 11 Dec 2020 20:26:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2406403AbgLKSt0 (ORCPT ); Fri, 11 Dec 2020 13:49:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56390 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406376AbgLKSsz (ORCPT ); Fri, 11 Dec 2020 13:48:55 -0500 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2126CC061D76 for ; Fri, 11 Dec 2020 10:47:06 -0800 (PST) Received: by mail-pg1-x549.google.com with SMTP id u26so7074099pgl.15 for ; Fri, 11 Dec 2020 10:47:06 -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=eJOu5ULB+j5PKw+BEEvH8i1sRvfR46/XAOq+5l8TcdE=; b=RNsVNk9rfWJRgJhnPu8tKl4xZ3XK+P117n64+jfeRxuRU7OckTxdduQUn0rQFZZJVK JY0s2ThPlJXNfuesUNy4qQ3uQ6VkP5ASRwViSOZDH9PEzNkXgsJJYnuOturiekfHhAnE BMGxOAye9LF6GlUS/cQHLsIHYbhoAlQO47vuBYWgWIh4Ce3sUs1MvtAQWZ5auUzCvg2J 8UB/8N8jmyDbgRaTOfT2H7pMLqPElQFcrUWQGbre4Su0z5/Uw+grYzDeUrDo5GvOUsKk hhusYQkb2Divz4sMPZM0KcULhtVtRw12Nf2ssUpus5luGnVDa71D2rpr2EygAIXCM6As niAA== 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=eJOu5ULB+j5PKw+BEEvH8i1sRvfR46/XAOq+5l8TcdE=; b=KPbPcOG9QBalBet/iUVfuDD9OLReopjjfQ1OvvsSRRULRRtlmfebbepV+AkelKNfsJ 9trofUKstzwfXTfNRG1dR7VkVFHGcXizo6ptA6d0vCCkwdnTdIY8aLbCue9SeOeOdZr/ t0+xydJy8lwbk2xgCZCmdrat6QoLyaGdmzlAcCk9PUZfRLWJCOnn4gyNxqMdUIM0EixU b9I4cggRemqjWZQwL1o6UJ+NoZK0gZcsCG/p7YWDoiLRvcPiHXu7ivyZLfCClXW0+pvF 99a7+lhaDgPfATcbboMmoYqQoQBJrzgDZZr1ataiJM70WdlZeKI8EDOvFhIYxnTcVmG+ +Zcg== X-Gm-Message-State: AOAM533pQWvzZ16T6SIWAdfIUf90tBgGQbJVE3OepTBwH0FdzBG8MXSK HQts9m7+afpTrPfb4RnLo19KVG7B5SkgHiQLW6s= X-Google-Smtp-Source: ABdhPJz0jKgJuUJrOj0cvusE84eexhNfATvSYqDzbLZYuW/7NEpt0846SG0sYBvcmPaDK3dyaOg+yr9NP20UvvW2JLE= 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:a17:902:5997:b029:da:a1cd:3cc2 with SMTP id p23-20020a1709025997b02900daa1cd3cc2mr12248005pli.80.1607712425571; Fri, 11 Dec 2020 10:47:05 -0800 (PST) Date: Fri, 11 Dec 2020 10:46:32 -0800 In-Reply-To: <20201211184633.3213045-1-samitolvanen@google.com> Message-Id: <20201211184633.3213045-16-samitolvanen@google.com> Mime-Version: 1.0 References: <20201211184633.3213045-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.576.ga3fc446d84-goog Subject: [PATCH v9 15/16] 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 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@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 Acked-by: Will Deacon --- arch/arm64/Kconfig | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index a6b5b7ef40ae..cf7eaaa0fb2f 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -159,6 +159,8 @@ 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