Message ID | 20201009161338.657380-25-samitolvanen@google.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <SRS0=9QnV=DQ=vger.kernel.org=linux-kbuild-owner@kernel.org> Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4EB8B139F for <patchwork-linux-kbuild@patchwork.kernel.org>; Fri, 9 Oct 2020 16:15:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B9FE22280 for <patchwork-linux-kbuild@patchwork.kernel.org>; Fri, 9 Oct 2020 16:15:46 +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 S2389925AbgJIQPp (ORCPT <rfc822;patchwork-linux-kbuild@patchwork.kernel.org>); Fri, 9 Oct 2020 12:15:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389835AbgJIQOw (ORCPT <rfc822;linux-kbuild@vger.kernel.org>); Fri, 9 Oct 2020 12:14:52 -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 5394DC0613B2 for <linux-kbuild@vger.kernel.org>; Fri, 9 Oct 2020 09:14:29 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id h64so9483030ybc.1 for <linux-kbuild@vger.kernel.org>; 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=ay+1POs1Q+MSk5YYN5F868/X2955dlylT/CD16XAQVolyd4mZAHNvv5VLdAJBUnUC9 2GzGd9Z2h3GsXEU5vKqR6iI6ExQJHHHy2ZeBjBspi12bPbGTDwxjjBLACiZFn82z+chA V/L/YD3vMdkx+aWoDccvZ2HhtqYy3blyHUvmXb/NKXi0uhgttOwiKXHggaJM8HYoJNkz g3S1l6SZsSrhQp40zQitztQEzf0oLtPX9lOvoB3aZbcS84UpjVjSXT6/4lrTjO5WVLPM OD4uldZb+fnPkNJDDdlDD6yalNVzw4pV/SPmgzvIHoBThM1ZNTfmyXjNv/DA0+FCzM1f 2E7w== X-Gm-Message-State: AOAM530OAYDXNjfh1OG+yo5x8/kV6zQX40cdvdxDdH1ymO+TeA0aNFia tc5+aVpCo3AXbz3m5l5T7wkjwANqatnkOBopWNg= X-Google-Smtp-Source: ABdhPJxS1cYLvTIq9AbU/WliPWkh+GMQ6EsM5q7afR6k6pEppCcn0hGMMeepAaLb0PMYcn/yVr6LGbihlfCH0HkjlAs= 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: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 <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-kbuild.vger.kernel.org> X-Mailing-List: linux-kbuild@vger.kernel.org |
Series |
Add support for Clang LTO
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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
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 <samitolvanen@google.com> --- arch/arm64/Kconfig | 2 ++ 1 file changed, 2 insertions(+)