From patchwork Fri Jun 4 06:49:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 12298887 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=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 6A1EEC47083 for ; Fri, 4 Jun 2021 06:52:18 +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 2B770613EC for ; Fri, 4 Jun 2021 06:52:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2B770613EC 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+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.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=WtSkAiNBGaMIxTQP0U/k+rzDXon+4dwAB2B3dor+lYA=; b=N5iOarlB+FHyF2 YSTivGvM0h+1283tXYw0vqepwjNiutDSQNiXuJKGMutd00bKyOyFJkYWs8hLcOXwTNHGCcMSWjPf4 E5qqQGOgek519NKrQ4FW/WFhmZLGDaKOzt0jTP3PFRnk6ta+dVW9l7HypEE1EEO7/PMd0WI+L3Nyz JSHEWf6nONWpCdYlkhZ385DeZp8YA9TMiISiPqYXZVRWhUJijSJcAmr87GLJkqmD0jrEcShtPG6QK zehUkvRdtJngbxG8l7rocttf0AR0voBzwMCvCPOLG2W0y0I1AYMM4CjnN5vmb7oFTCB3thMUrqBlW 8D1TrqQaAQbh3uQR21WA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lp3fD-00BoI2-F7; Fri, 04 Jun 2021 06:50:39 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lp3eI-00BngP-AW; Fri, 04 Jun 2021 06:49:46 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8DFE361413; Fri, 4 Jun 2021 06:49:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1622789382; bh=M0bKVaGHx9OxuQ1E9oxHVBUkdvBwvAMGJJiXepUaSFE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m1xo4u+Si7emA8slitIie2ULoZsht8ha8SyFQj02+XTG+F7A4NOe0gxxUMGWIJTYB wc/7fwptpwZlBWfX9JbNIM8WSNKc7buOk4ow62hlWtFbm6GX2hvzrUjXRteHjFMesG YHVA8gxQKJ31bz/McyrtB1rVOQJP3nvxhBaP6+U6nn6e14KMbUBmAooBuLNipUKl+c QvKYiEU3jQMHkfPgbsooR2npgVhJA2i+CcLHv2piAdbgl2xzodE3c1FH28gVaB9v0c t7tPqS9VdVO+hJS7qBFpEoO0tettUxDG1qodQSZXt2uovcEHRnxWhvsHDFPz6pQrlv S/UZADKg8NZ6A== 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 v2 2/9] arc: update comment about HIGHMEM implementation Date: Fri, 4 Jun 2021 09:49:09 +0300 Message-Id: <20210604064916.26580-3-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210604064916.26580-1-rppt@kernel.org> References: <20210604064916.26580-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210603_234942_418268_0F570D37 X-CRM114-Status: GOOD ( 12.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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);