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: 12305957 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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 5E7CCC48BCD for ; Tue, 8 Jun 2021 09:13:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 47E7F6124B for ; Tue, 8 Jun 2021 09:13:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231214AbhFHJPj (ORCPT ); Tue, 8 Jun 2021 05:15:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:34110 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231169AbhFHJPe (ORCPT ); Tue, 8 Jun 2021 05:15:34 -0400 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 Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org 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);