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: 11585971 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 B9AD0618 for ; Wed, 3 Jun 2020 16:11:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3A4BC20772 for ; Wed, 3 Jun 2020 16:11:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="NChHWJY8" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3A4BC20772 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 57AC780007; Wed, 3 Jun 2020 12:11:43 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 551C18E0006; Wed, 3 Jun 2020 12:11:43 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4675480007; Wed, 3 Jun 2020 12:11:43 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0159.hostedemail.com [216.40.44.159]) by kanga.kvack.org (Postfix) with ESMTP id 2FDE68E0006 for ; Wed, 3 Jun 2020 12:11:43 -0400 (EDT) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id D814C801CFC0 for ; Wed, 3 Jun 2020 16:11:42 +0000 (UTC) X-FDA: 76888391244.25.mist75_6611ef9069a1f Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin25.hostedemail.com (Postfix) with ESMTP id 66B02180A6F64 for ; Wed, 3 Jun 2020 16:11:42 +0000 (UTC) X-Spam-Summary: 2,0,0,e06f82e17b12d758,d41d8cd98f00b204,miles.chen@mediatek.com,,RULES_HIT:41:334:355:368:369:379:541:800:960:973:988:989:1185:1260:1277:1311:1313:1314:1345:1437:1514:1515:1516:1518:1534:1540:1585:1711:1714:1730:1747:1777:1792:2393:2559:2562:3138:3139:3140:3141:3142:3350:3865:3867:3870:3871:3872:4321:5007:6119:6261:6630:6653:7903:10004:10400:11026:11473:11658:11914:12043:12296:12297:12438:12521:12555:12895:13069:13311:13357:14181:14394:14721:21080:21627:30054:30089,0,RBL:210.61.82.184:@mediatek.com:.lbl8.mailshell.net-64.201.201.201 62.14.12.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:136,LUA_SUMMARY:none X-HE-Tag: mist75_6611ef9069a1f X-Filterd-Recvd-Size: 3129 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by imf34.hostedemail.com (Postfix) with ESMTP for ; Wed, 3 Jun 2020 16:11:41 +0000 (UTC) X-UUID: 7580392a69de49d38c447f71ce03f9f7-20200604 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: 7580392a69de49d38c447f71ce03f9f7-20200604 Received: from mtkcas10.mediatek.inc [(172.21.101.39)] by mailgw02.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.10 Build 0809 with TLS) with ESMTP id 1938197506; Thu, 04 Jun 2020 00:11:35 +0800 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 CC: , , , , , Miles Chen 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-Rspamd-Queue-Id: 66B02180A6F64 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 X-Bogosity: Ham, tests=bogofilter, spamicity=0.005581, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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;