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, URIBL_BLOCKED,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 CE79DC43465 for ; Fri, 18 Sep 2020 20:16:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 798A223600 for ; Fri, 18 Sep 2020 20:16:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="mPsAHQEX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726729AbgIRUQx (ORCPT ); Fri, 18 Sep 2020 16:16:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726566AbgIRUPR (ORCPT ); Fri, 18 Sep 2020 16:15:17 -0400 Received: from mail-qt1-x84a.google.com (mail-qt1-x84a.google.com [IPv6:2607:f8b0:4864:20::84a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EFD5DC0613D2 for ; Fri, 18 Sep 2020 13:15:16 -0700 (PDT) Received: by mail-qt1-x84a.google.com with SMTP id o13so6095326qtl.6 for ; Fri, 18 Sep 2020 13:15:16 -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=H5U0Hz5E6z5ldjvQ4xJDZFkCK4qV/McKETGlhtu7sL8=; b=mPsAHQEXqvNlGarzu6iBRQPA6ECa8TLJT1//z5ygvSXXqueGgBTsUBMgdhH3MoF60t ZhVFIxUiDXEpZ89jhGqvkk+xwepAhB4h8zd+bjJyvbcb5izzUs/Tg/9RldZdUROXbjeI BxVX/BdnoiStlDzxH6+NO+6HwWWfNd4qZM0lZORWe65ACPTad8UErkxRWB5rEkhp08DZ 0KGl75iSGd/JKl1QjNefLbTEyfWqmsoCEu++j8qCHyYi8XPRYhVdpn0nAEZ8fdky4y7y S1k0KQu3X95IfiUivguLiKYbpdCh3C48qnuiieKQ7b0xjFzd4Be04GxhMxIhkfZAaqOO 4wGw== 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=H5U0Hz5E6z5ldjvQ4xJDZFkCK4qV/McKETGlhtu7sL8=; b=faPUckABloQyR/740DxIdaDfmTrriRLyWbd6hUQ4g447fiYzDzgD2exp1WGm52M7Uh gwAWOnVY5vnrYhnbZVO3fiW75hoyMxjB2R0ePvEAV9Y19THXKXmhWygbKgB4SYdCZ8MF QyhBu+/cmJVGP5juCqyMQ/5QENRBwTHMNBFl9N/FP7YscODA/dnjZjahj+B5wSP1dm14 wv96k5vbiixnVQ2WWo8o+DnkdjGDvRqy5F+4zt+GzumzpZOZw34CB1fPIR/bMNZCb57a MK1AH7CWqW2Oys3QoS4YOjrCXUpwjPjuv/Wa0kTUs1QCEdpmgr8JVyhnGQ74rh7udxuP bEwQ== X-Gm-Message-State: AOAM533+qFpdijGhYNkQTIVtsKidoP1LSXtk2YjQ9q5shFnHJbLC/oHR lkBA+HZkb/7h4Ewzzz5xUD7UUzigxZsjh6lSH/c= X-Google-Smtp-Source: ABdhPJw8z6vjGGaGGnrlRrziyohZvVfic1DZGt/qPzbkK2DflW6NVM+pA6gyTB+Ke9wzzcJbF1DtstV10V20omnh/NQ= 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:ad4:47cc:: with SMTP id p12mr34218336qvw.25.1600460116095; Fri, 18 Sep 2020 13:15:16 -0700 (PDT) Date: Fri, 18 Sep 2020 13:14:22 -0700 In-Reply-To: <20200918201436.2932360-1-samitolvanen@google.com> Message-Id: <20200918201436.2932360-17-samitolvanen@google.com> Mime-Version: 1.0 References: <20200918201436.2932360-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.681.g6f77f65b4e-goog Subject: [PATCH v3 16/30] kbuild: lto: remove duplicate dependencies from .mod files From: Sami Tolvanen To: Masahiro Yamada , Will Deacon Cc: Peter Zijlstra , Steven Rostedt , 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-pci@vger.kernel.org With LTO, llvm-nm prints out symbols for each archive member separately, which results in a lot of duplicate dependencies in the .mod file when CONFIG_TRIM_UNUSED_SYMS is enabled. When a module consists of several compilation units, the output can exceed the default xargs command size limit and split the dependency list to multiple lines, which results in used symbols getting trimmed. This change removes duplicate dependencies, which will reduce the probability of this happening and makes .mod files smaller and easier to read. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- scripts/Makefile.build | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 541dbe791743..b417c697536e 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -266,7 +266,7 @@ endef # List module undefined symbols (or empty line if not enabled) ifdef CONFIG_TRIM_UNUSED_KSYMS -cmd_undef_syms = $(NM) $< | sed -n 's/^ *U //p' | xargs echo +cmd_undef_syms = $(NM) $< | sed -n 's/^ *U //p' | sort -u | xargs echo else cmd_undef_syms = echo endif -- 2.28.0.681.g6f77f65b4e-goog