From patchwork Tue Jun 8 09:13:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 12306013 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=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 2D431C4743E for ; Tue, 8 Jun 2021 09:13:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CD4C36128B for ; Tue, 8 Jun 2021 09:13:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CD4C36128B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6CDD16B0080; Tue, 8 Jun 2021 05:13:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6A3CF6B0081; Tue, 8 Jun 2021 05:13:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 56BC96B0082; Tue, 8 Jun 2021 05:13:43 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 27DA36B0080 for ; Tue, 8 Jun 2021 05:13:43 -0400 (EDT) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id B63958249980 for ; Tue, 8 Jun 2021 09:13:42 +0000 (UTC) X-FDA: 78229993884.18.1F9DCC1 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf03.hostedemail.com (Postfix) with ESMTP id 2034CC00CBFC for ; Tue, 8 Jun 2021 09:13:39 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 772B76127A; Tue, 8 Jun 2021 09:13:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623143621; bh=5M6SI0E8FaPqJBzrojGurF0bG6c1so4urASqP1MJ6OI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MSPk8XP/fk/HQXwQR0Y8X62d/zOfv3kCpxM2mgVp0yMl7xGTgSgJ6awXhx4yAVG3v 5byIdcpdttB0jtR+0YGpI1sethOsTHVJWfNUJY7+qhuUbKld0uYkWcQ9WINSpcrwus E11KhPbHhno3hkty1rt2rw/QxWboDsiZ1qlahi+WW4fkUd7RnjOBxr3Zr7qJdc0qMQ wg6SQ4ojIq5rDG8FiHgoN8aYP75GHBOsrUGkafVgrmB1H8TsemMLwY+eQBZ/uW9xEY ourFYcy5QDhZVTfn6Zx3jTKWLUFIA5icx2/1V4WIICpvDjLI8buDIL5lq3FHWUjueL uR0PflBnBFzaw== From: Mike Rapoport To: Andrew Morton Cc: Arnd Bergmann , Geert Uytterhoeven , Ivan Kokshaysky , Jonathan Corbet , Matt Turner , Mike Rapoport , Mike Rapoport , Richard Henderson , Vineet Gupta , kexec@lists.infradead.org, linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-xtensa@linux-xtensa.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org Subject: [PATCH v3 2/9] arc: update comment about HIGHMEM implementation Date: Tue, 8 Jun 2021 12:13:09 +0300 Message-Id: <20210608091316.3622-3-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210608091316.3622-1-rppt@kernel.org> References: <20210608091316.3622-1-rppt@kernel.org> MIME-Version: 1.0 Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="MSPk8XP/"; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf03.hostedemail.com: domain of rppt@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=rppt@kernel.org X-Stat-Signature: zgmz5oc33ozuogxwehu1nir4jksrks6b X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 2034CC00CBFC X-HE-Tag: 1623143619-117199 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Mike Rapoport Arc does not use DISCONTIGMEM to implement high memory, update the comment describing how high memory works to reflect this. Signed-off-by: Mike Rapoport Acked-by: Vineet Gupta --- arch/arc/mm/init.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c index e2ed355438c9..397a201adfe3 100644 --- a/arch/arc/mm/init.c +++ b/arch/arc/mm/init.c @@ -139,16 +139,13 @@ void __init setup_arch_memory(void) #ifdef CONFIG_HIGHMEM /* - * Populate a new node with highmem - * * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based) - * than addresses in normal ala low memory (0x8000_0000 based). + * than addresses in normal aka low memory (0x8000_0000 based). * Even with PAE, the huge peripheral space hole would waste a lot of - * mem with single mem_map[]. This warrants a mem_map per region design. - * Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM. - * - * DISCONTIGMEM in turns requires multiple nodes. node 0 above is - * populated with normal memory zone while node 1 only has highmem + * mem with single contiguous mem_map[]. + * Thus when HIGHMEM on ARC is enabled the memory map corresponding + * to the hole is freed and ARC specific version of pfn_valid() + * handles the hole in the memory map. */ #ifdef CONFIG_DISCONTIGMEM node_set_online(1);