From patchwork Wed Jun 3 16:11:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miles Chen X-Patchwork-Id: 11585975 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0DCB3159A for ; Wed, 3 Jun 2020 16:11:55 +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 DF9E8206E6 for ; Wed, 3 Jun 2020 16:11:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="lB/5MpoI"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="NChHWJY8" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DF9E8206E6 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=6eD7Y8Dk1tVSh7ab6BaekhAgnqSSDxCPWQKDgG2dExs=; b=lB/5MpoIRNzAp1 fx82O9uuCs9U6cjOk1dKJABv/C564IuecqQ0yS5x8VEzDV2leRJzfHv4VPS871xw1uLqOWquUZgpz DP3DR57mA8fjDbeBy1Y7aVL8AMS+5VAZZiLLazTctp4N7Jt63W39nFehMYAokSoXzRl30xUE0kY7Z mxdl/EReWGbGssaJIC5lPBAq3KX+m3n1qy4xrx40R71xRjC49n6bqlAQRTT1gV2zvOgVSNJRKrClT Q7OMZuzdutItmHHIWs+XC7GNG7zUqqaNb0xaM6e9TsC17gbzdxhUfrON5zoWYQE2W7AgPN97xz7RH Jts5He3qo6Wcp5nQUN5Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jgVzd-0006j2-RP; Wed, 03 Jun 2020 16:11:53 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jgVzW-0006ct-Sv; Wed, 03 Jun 2020 16:11:49 +0000 X-UUID: 52c81e604f064e968c089ccecedc9cf6-20200603 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=dcLz9a48qWis1A4C8qZ1IIJYb+koWT5X7xxpq9JWgPU=; b=NChHWJY8XfG9/EQKsn4lxUe19eQYv9kB+Boz1ySvE6Dxc1nQDvN4vfCEZZHhsESN8HWojhwltbEIx1Dau/nQ2QVSh39EZWwk8NuJEpByYdZqlNzA2Iv0tP+mul5nKEINcPW01/8iYuzy1z4PEIp02GxJCl9CJm2SdP5Xe5+pVVA=; X-UUID: 52c81e604f064e968c089ccecedc9cf6-20200603 Received: from mtkcas68.mediatek.inc [(172.29.94.19)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLS) with ESMTP id 395526929; Wed, 03 Jun 2020 08:11:13 -0800 Received: from MTKMBS06N1.mediatek.inc (172.21.101.129) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 3 Jun 2020 09:11:33 -0700 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs06n1.mediatek.inc (172.21.101.129) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 4 Jun 2020 00:11:34 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 4 Jun 2020 00:11:30 +0800 From: Miles Chen To: Mike Rapoport , Andrew Morton , Matthias Brugger Subject: [PATCH] mm/memblock: export max_pfn for kernel modules Date: Thu, 4 Jun 2020 00:11:32 +0800 Message-ID: <20200603161132.2441-1-miles.chen@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200603_091146_937832_31828B78 X-CRM114-Status: UNSURE ( 8.43 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 MIME_BASE64_TEXT RAW: Message text disguised using base64 encoding -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Miles Chen , linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org max_pfn is uesd to get the highest pfn in the system. Drivers like drivers/iommu/mtk_iommu.c checks max_pfn to see if it should enable its "4GB mode". This patch exports the max_pfn symbol, so we can build the driver as a kernel module. Signed-off-by: Miles Chen --- mm/memblock.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/memblock.c b/mm/memblock.c index c79ba6f9920c..3b2b21ecebb6 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -99,6 +99,7 @@ EXPORT_SYMBOL(contig_page_data); unsigned long max_low_pfn; unsigned long min_low_pfn; unsigned long max_pfn; +EXPORT_SYMBOL(max_pfn); unsigned long long max_possible_pfn; static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;