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=-5.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 DF32AC433FF for ; Thu, 1 Aug 2019 12:12:18 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B4A26214DA for ; Thu, 1 Aug 2019 12:12:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="FH1PAZ+E"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="GwbL0bM/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B4A26214DA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Y1Ykg4ypBBtwX49+LXGh2aKMRdPQKRx77hIw3isCwQg=; b=FH1PAZ+EQ+MXCs mu3xSNauaUhA/DmJA2E7rD1doUq8TOckJCFr/pwnE+PykMFSEQkROZQYO4SFwIA5N5wEt+NS3yUge XBCZh5+r2bzCGhLxCBcdCTtz1UU8mraPbW4aOcW3U19Nq8Sif1OWY0q8Wx0sr7lpoYqmiS9FHqP33 5eE5CeMzupL0GN1oRHifHXq2oLjD1snLoi1HvA3vG+T4J0DxVCai6O1msTazjbfY/5stYt+GFk0em fa4ckVa3KJ/ns8yvaKMj+9oTEoHR018HLCmnhih40Tb2NHxxp18lvfsHNzRDqeTucxQyE3cMMhtTj ugjcYqaTHKSIT0MTU75g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1ht9wJ-0002aX-PQ; Thu, 01 Aug 2019 12:12:11 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1ht9ph-0004FO-GK for linux-arm-kernel@lists.infradead.org; Thu, 01 Aug 2019 12:05:22 +0000 Received: from willie-the-truck (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CBD6120644; Thu, 1 Aug 2019 12:05:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564661121; bh=r8N5G32/4WJfu9tbkO4HoOabI/s6zR5gduiOkyQhwng=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=GwbL0bM/j06WGzr0meVEoAerbR3PRsd910oi50JP0ihlQ8nHIBE6XkB2OUZeKU8YZ 59VbWZW3BZOVzVxLkhmHzr0NbNHjDzKmYDcdWGF3jq++1f4e8hAIX5Jw//AFu4bpgz rH20ELzJy803JDRWEoj4SsUUADyr6EJCvH6/LssU= Date: Thu, 1 Aug 2019 13:05:17 +0100 From: Will Deacon To: Peter Collingbourne Subject: Re: [PATCH v3] arm64: Add support for relocating the kernel with RELR relocations Message-ID: <20190801120516.pe6vzl2bmko6hhk6@willie-the-truck> References: <20190712193846.174893-1-pcc@google.com> <20190801011842.199786-1-pcc@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190801011842.199786-1-pcc@google.com> User-Agent: NeoMutt/20170113 (1.7.2) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190801_050521_577549_089C613F X-CRM114-Status: GOOD ( 14.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , clang-built-linux@googlegroups.com, Catalin Marinas , Ard Biesheuvel , Nick Desaulniers , Masahiro Yamada , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Jul 31, 2019 at 06:18:42PM -0700, Peter Collingbourne wrote: > RELR is a relocation packing format for relative relocations. > The format is described in a generic-abi proposal: > https://groups.google.com/d/topic/generic-abi/bX460iggiKg/discussion > > The LLD linker can be instructed to pack relocations in the RELR > format by passing the flag --pack-dyn-relocs=relr. > > This patch adds a new config option, CONFIG_RELR. Enabling this option > instructs the linker to pack vmlinux's relative relocations in the RELR > format, and causes the kernel to apply the relocations at startup along > with the RELA relocations. RELA relocations still need to be applied > because the linker will emit RELA relative relocations if they are > unrepresentable in the RELR format (i.e. address not a multiple of 2). > > Enabling CONFIG_RELR reduces the size of a defconfig kernel image > with CONFIG_RANDOMIZE_BASE by 3.5MB/16% uncompressed, or 550KB/5% > compressed (lz4). > > Signed-off-by: Peter Collingbourne > Tested-by: Nick Desaulniers > Reviewed-by: Nick Desaulniers > --- > > Notes: > Changes in v3: > - Move Kconfig/Makefile logic to arch-independent location > - Tweak CONFIG_RELR documentation to remove "currently" Excellent, thanks. Queued for 5.4. One more question: is there any benefit to supporting this for loadable modules as well? Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel