From patchwork Fri Aug 5 13:32:52 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicholas Piggin X-Patchwork-Id: 656201 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3s5STB3Vnwz9s9k for ; Fri, 5 Aug 2016 23:34:22 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=SuTbZ8ut; dkim-atps=neutral Received: from ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3s5STB2VFnzDqdf for ; Fri, 5 Aug 2016 23:34:22 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=SuTbZ8ut; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from mail-pa0-x242.google.com (mail-pa0-x242.google.com [IPv6:2607:f8b0:400e:c03::242]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3s5SRg4NSszDqQq for ; Fri, 5 Aug 2016 23:33:02 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=SuTbZ8ut; dkim-atps=neutral Received: by mail-pa0-x242.google.com with SMTP id ez1so19330006pab.3 for ; Fri, 05 Aug 2016 06:33:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:cc:subject:message-id:in-reply-to:references :organization:mime-version:content-transfer-encoding; bh=rN5Nj6iSxIkoyUnFPxoR4UTGZz8Pl/l2tuvP8PlqlU4=; b=SuTbZ8utbf/Tfsy0Psh/dXo9g8w1sMLmMFkC2zIRgtQvY8kjf23ZxY1JBaC71scxwT y9rWWw1IQ022n1aGOmA5IWJrUeS8hEinBcK8tPOhzFC46aDFmt1qdTc+7z74Jq/4qGdz pkXgv4rsNFmIMGaBt9waNZflzXXJYbsqvNEwkovx9FC+EQ7qeu28c6zI0S3SSm6R3GAm /xFdntN2q5RjyXU/blAcd8lJ/rjP0l2ZIhPjJpffjMjtXZVcM1VR6ldxpisaJF7puwp5 ppir46Ny4K6Sh+2knW6M+0QrNFDHQLHd19PRSEWonOwWhKZbDb8B8iPljeN+36uRQE1B ezSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to :references:organization:mime-version:content-transfer-encoding; bh=rN5Nj6iSxIkoyUnFPxoR4UTGZz8Pl/l2tuvP8PlqlU4=; b=PAAwm419LGMO8//UFKt8VskzDY34y9VUosh70AlUUPG4f/EUZiZS/hORM2A2Ia9M5L 91wweHDc8ktrgw0E9ZzjHT7zwfUFGqfPDNPimegd33AOKvqSkT58kZdn8yKvm6i58T4b qFj5fiuZ9QaobGh0sRy0y8WIZ7kfxW7CFsYPvQCJ+S4dhBoKb7wWQdfduOeYsEs0fLMM EpFg8yPZFaZf6o8c8H6/f7Sxjon1nROqymiTs7lt2vNpRGgFCMC+sL7noSVK+WPVz8S/ NM0inDH2shoVdirb5XzP/Tjbadf7o+jlGrYinDx0VSAYOzZ9JHaULoykF2b7zqcIf6UA CW0Q== X-Gm-Message-State: AEkoout9B9upEJJf5x2R5Vg71XJ+Md61/0LuEiTUHnL4I+JtmdMBB6JqhM1Tknr3yA1mYQ== X-Received: by 10.66.51.137 with SMTP id k9mr134848527pao.49.1470403980635; Fri, 05 Aug 2016 06:33:00 -0700 (PDT) Received: from roar.ozlabs.ibm.com ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id q26sm28258175pfj.53.2016.08.05.06.32.56 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 05 Aug 2016 06:33:00 -0700 (PDT) Date: Fri, 5 Aug 2016 23:32:52 +1000 From: Nicholas Piggin To: linux-kbuild@vger.kernel.org Subject: Re: [RFC][PATCH 0/5] kbuild changes, thin archives, --gc-sections Message-ID: <20160805233252.50cb8cce@roar.ozlabs.ibm.com> In-Reply-To: <1470399123-8455-1-git-send-email-npiggin@gmail.com> References: <1470399123-8455-1-git-send-email-npiggin@gmail.com> Organization: IBM X-Mailer: Claws Mail 3.13.2 (GTK+ 2.24.30; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, Stephen Rothwell , Arnd Bergmann , Nicolas Pitre , Alan Modra , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, 5 Aug 2016 22:11:58 +1000 Nicholas Piggin wrote: > Hello, > > I have 3 different things in this patchset. All arch specific, but all > involve kbuild changes, so I'd like to discuss them with kbuild > maintainers. The goal has been to improve long standing linking > difficulties with the powerpc kernel. Here's a 30 second hack of an x86 patch. It seems to build and boot defconfig in a really quick kvm test. For x86-64 machine building x86 target, defconfig, make -j8 vmlinux time: orig thinarc thinarc+dce real 4m58.865s 4m59.747s 5m20.028s user 15m14.428s 15m13.868s 15m17.012s sys 0m57.296s 0m55.904s 0m58.416s build output directory size: orig thinarc thinarc+dce 317M 257M 285M vmlinux size: text data bss dec filename 10192338 4360136 1105920 15658394 vmlinux 10186739 4356040 1105920 15648699 vmlinux.thinarc 9580486 3759880 1011712 14352078 vmlinux.thinarc+dce Thanks, Nick diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 0a7b885..845069e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -51,6 +51,8 @@ config X86 select ARCH_WANT_IPC_PARSE_VERSION if X86_32 select ARCH_WANT_OPTIONAL_GPIOLIB select BUILDTIME_EXTABLE_SORT + select THIN_ARCHIVES + select LINKER_DCE select CLKEVT_I8253 select CLKSRC_I8253 if X86_32 select CLOCKSOURCE_VALIDATE_LAST_CYCLE diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index 9297a00..7395dd8 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -92,7 +92,7 @@ SECTIONS .text : AT(ADDR(.text) - LOAD_OFFSET) { _text = .; /* bootstrapping code */ - HEAD_TEXT + KEEP(HEAD_TEXT) . = ALIGN(8); _stext = .; TEXT_TEXT @@ -321,7 +321,7 @@ SECTIONS .bss : AT(ADDR(.bss) - LOAD_OFFSET) { __bss_start = .; *(.bss..page_aligned) - *(.bss) + *(.bss .bss.*) . = ALIGN(PAGE_SIZE); __bss_stop = .; }