From patchwork Wed Jun 2 10:53:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 12293783 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 3C7A0C4708F for ; Wed, 2 Jun 2021 11:01:33 +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 F20296023F for ; Wed, 2 Jun 2021 11:01:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F20296023F 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=AdJLeTWStA7P/k ts8b4KUmx5TGAz25AmAFySS4002r+6I2qpP1I55gCr2jmVLKzkK9UuIGErohGrw2j1p/tN14PHrZT Fw0uesoH9aY8jllGng3tCjVIwrRBEd6BvTncUkTY4nzFzLKTjkroURdx5MYDulj0SzKsO9hp8A9Dk 6PsixiI7o3jsK7vFIlHUoTk1OJmuBwpgJEschYlso2wv+nQL3oy+NmWhfccHdTzw4+xuH4foAqVmx 5Jq6/+pLQqIVxGap77bBrCInAiUUEbJg37XSReNVJAUHrxu7g2cpMCLtsLOrZLyUShd/7bhuE7Lo7 xiThZFpj8tZo4d/tEMmQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1loOaq-003WKH-8m; Wed, 02 Jun 2021 10:59:25 +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 1loOVp-003U9X-Bt; Wed, 02 Jun 2021 10:54:14 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id F3015613D2; Wed, 2 Jun 2021 10:54:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1622631253; bh=M0bKVaGHx9OxuQ1E9oxHVBUkdvBwvAMGJJiXepUaSFE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NZQ2rr2E/OctHk1XnG/C5vLVoo2DWWNRKDUphu7Fh35eCKk7WRb+E/oZ1QWpjns4n 483dCoOUenIqXs2GkrV7dD0CBQudFaPjtEpqVBzYDkYbv3dPEwgvpFNS1sK8Qm2M5h dfPcSWwLtEgixqKEsihdQBlQLPat/EiAfVdcN+PKy/jPFrwO4GBJW17FhoiRnP5FE/ LjACmzvLPl6AQjzug1qGPe7CVpkPamqtdaxLDkkdyw7FIplstRB17LG7WMeV+G4ZvT AznPR6UfbTW4ZrJ8sIkP2lNwVl5gX3ybDLO4yKMbiW88ZJjTyFtboulTH3d2QuUriT IjqRNXEinP8RQ== 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 2/9] arc: update comment about HIGHMEM implementation Date: Wed, 2 Jun 2021 13:53:41 +0300 Message-Id: <20210602105348.13387-3-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210602105348.13387-1-rppt@kernel.org> References: <20210602105348.13387-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210602_035413_478204_EEB386FB X-CRM114-Status: GOOD ( 13.28 ) 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 Reviewed-by: David Hildenbrand --- 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);