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=-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,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 CBEE8C4708F for ; Fri, 4 Jun 2021 06:51:09 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 3E9726140F for ; Fri, 4 Jun 2021 06:51:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3E9726140F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4FxD1l5ql1z3c2S for ; Fri, 4 Jun 2021 16:51:07 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=m1xo4u+S; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=198.145.29.99; helo=mail.kernel.org; envelope-from=rppt@kernel.org; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=m1xo4u+S; dkim-atps=neutral Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4FxD08439Sz306H for ; Fri, 4 Jun 2021 16:49:44 +1000 (AEST) 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 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 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Jonathan Corbet , linux-doc@vger.kernel.org, Mike Rapoport , Geert Uytterhoeven , Matt Turner , linux-snps-arc@lists.infradead.org, linux-xtensa@linux-xtensa.org, Arnd Bergmann , linux-m68k@lists.linux-m68k.org, Ivan Kokshaysky , linux-arm-kernel@lists.infradead.org, Richard Henderson , Vineet Gupta , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Mike Rapoport Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 --- 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); -- 2.28.0