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=-21.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=ham 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 42D5EC282CE for ; Mon, 11 Feb 2019 19:30:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 139FD2186A for ; Mon, 11 Feb 2019 19:30:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="P33ZEVn9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388318AbfBKTau (ORCPT ); Mon, 11 Feb 2019 14:30:50 -0500 Received: from mail-qk1-f201.google.com ([209.85.222.201]:42865 "EHLO mail-qk1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388241AbfBKTat (ORCPT ); Mon, 11 Feb 2019 14:30:49 -0500 Received: by mail-qk1-f201.google.com with SMTP id 207so5175451qkf.9 for ; Mon, 11 Feb 2019 11:30:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=fgo15CY3NgYRpF97TzDUfVV2bSFDYAqgksNtaJxXuEA=; b=P33ZEVn9lWw4ExXF0pVb2kRhsMzsHIZnSCIoTjgHA67m1TBvJkvTccmmchHplJnzYi tK2h0WoALbgU2nZkZBJ2SxgLYpjlLfwsyM0qPDqW+WBGaVbVrCsDmIH6NfN+z6JfOa8G T+CWOFyTf+3H6TpEGTUvVR3EWZKAFrVXa/1HeoxRLcFre021WqnSEaB0okT2cdrUH/Zp j6/LfS6vWUOX8eAWpEshZ9EdhfKAPlTBxfbG9fyzxahFURQCfQqWoyJvynTy4bLNZmAd Fru81lvlu6FIits75GNMSWZETZYzfa/xtYGwkz6eLWKT5EO6vuFx7ZpACi8+YI0l12y3 10LQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=fgo15CY3NgYRpF97TzDUfVV2bSFDYAqgksNtaJxXuEA=; b=U2F65+YXMKudz+1Yr7Ch+CT4ZLPc0aERcASVopTdV12tIoJAtmTuJ9UTqUQgizm5nt GALwQcM1HsR+mh864NlNVshll8rbExrWVxwi21/ijrPeqqz2/sPPp9wgYuS3Hflc2xKo vOd+zcFvdztsxNTr1RKy6YA4GzjsRAyv3K6l3jxD5G8/J97Z+F2hYEtdiML2a+tpKfE3 yg6tX5Udpotb2Rxy8vkXlry2agsPafqhuQibWEiyyOZTQSuqHfR28r9nx1Bqn1kswR7s BGvlIxSzvHeNfiYSY1iGJx0THWIsvzJN3oQhjFXcpKfjUCDhD0bxaw/1dIa5SW2auIaY h2ow== X-Gm-Message-State: AHQUAuYjSKd+59Vyq7/SGE3xdHFZZwGgbrcH0jn1SX85U7sDwOmxdTGy Q4qEE+lnz4AleW+09jQWXFIiMJNtinGiHrLPO2E= X-Google-Smtp-Source: AHgI3IY6emNTamoLiOwa6pdZ0u5LLMBlSN9RZx8mrz70CAMQpxHxS0uzBm81DdK35Kw3x7EGXJpyDAJvrnUO/HSEvdc= X-Received: by 2002:a0c:add8:: with SMTP id x24mr21936434qvc.16.1549913448304; Mon, 11 Feb 2019 11:30:48 -0800 (PST) Date: Mon, 11 Feb 2019 11:30:06 -0800 In-Reply-To: <20190211193008.24101-1-ndesaulniers@google.com> Message-Id: <20190211193008.24101-4-ndesaulniers@google.com> Mime-Version: 1.0 References: <20190211193008.24101-1-ndesaulniers@google.com> X-Mailer: git-send-email 2.20.1.791.gb4d0f1c61a-goog Subject: [PATCH v2 4/4] Makefile: lld: set -O2 linker flag when linking with LLD From: ndesaulniers@google.com To: yamada.masahiro@socionext.com Cc: natechancellor@gmail.com, sedat.dilek@gmail.com, keescook@chromium.org, samitolvanen@google.com, michal.lkml@markovi.net, akpm@linux-foundation.org, hannes@cmpxchg.org, peterz@infradead.org, linux@dominikbrodowski.net, npiggin@gmail.com, mathieu.desnoyers@efficios.com, gor@linux.ibm.com, adrian@lisas.de, rgb@redhat.com, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, Nick Desaulniers , Rui Ueyama Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For arm64: 0.34% size improvement with lld -O2 over lld for vmlinux. 3.3% size improvement with lld -O2 over lld for Image.lz4-dtb. Link: https://github.com/ClangBuiltLinux/linux/issues/343 Suggested-by: Rui Ueyama Suggested-by: Nathan Chancellor Reviewed-by: Nathan Chancellor Tested-by: Nathan Chancellor Signed-off-by: Nick Desaulniers --- Changes V1->V2: * add tested and reviewed by tags. Makefile | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Makefile b/Makefile index 00e8e01d23fc..8011555745aa 100644 --- a/Makefile +++ b/Makefile @@ -718,6 +718,10 @@ else KBUILD_CFLAGS += -Wno-unused-but-set-variable endif +ifdef CONFIG_LD_IS_LLD +KBUILD_LDFLAGS += -O2 +endif + KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) ifdef CONFIG_FRAME_POINTER KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls -- 2.20.1.791.gb4d0f1c61a-goog