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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 266FDC433F5 for ; Tue, 28 Sep 2021 19:34:48 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A5BF560FBF for ; Tue, 28 Sep 2021 19:34:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A5BF560FBF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=quicinc.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 0D667900002; Tue, 28 Sep 2021 15:34:47 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 05F1B6B0072; Tue, 28 Sep 2021 15:34:47 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E6714900002; 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Received: from unknown (HELO ironmsg04-sd.qualcomm.com) ([10.53.140.144]) by alexa-out-sd-02.qualcomm.com with ESMTP; 28 Sep 2021 12:34:44 -0700 X-QCInternal: smtphost Received: from unknown (HELO nasanex01a.na.qualcomm.com) ([10.52.223.231]) by ironmsg04-sd.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Sep 2021 12:34:44 -0700 Received: from [10.251.44.228] (10.80.80.8) by nasanex01a.na.qualcomm.com (10.52.223.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.922.7; Tue, 28 Sep 2021 12:34:41 -0700 Message-ID: <61e2f232-4abe-bb10-fff5-cabe8da5a7a9@quicinc.com> Date: Tue, 28 Sep 2021 22:34:39 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.1.1 Subject: Re: [PATCH] arm64: mm: update max_pfn after memory hotplug Content-Language: en-US To: Chris Goldsworthy , Andrew Morton CC: David Hildenbrand , Catalin Marinas , Will Deacon , "Sudarshan Rajagopalan" , , , , Florian Fainelli References: From: Georgi Djakov In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nasanex01a.na.qualcomm.com (10.52.223.231) X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: CD5D8100009E X-Stat-Signature: t8531xkz6ge49xhw5xpguau5ys1m3ngw Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=quicinc.com header.s=qcdkim header.b=P8mujFIl; spf=pass (imf07.hostedemail.com: domain of quic_c_gdjako@quicinc.com designates 199.106.114.39 as permitted sender) smtp.mailfrom=quic_c_gdjako@quicinc.com; dmarc=pass (policy=none) header.from=quicinc.com X-HE-Tag: 1632857685-914669 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 9/28/2021 9:51 PM, Chris Goldsworthy wrote: > From: Sudarshan Rajagopalan > > After new memory blocks have been hotplugged, max_pfn and max_low_pfn > needs updating to reflect on new PFNs being hot added to system. > Without this patch, debug-related functions that use max_pfn such as > get_max_dump_pfn() or read_page_owner() will not work with any page in > memory that is hot-added after boot. > > Fixes: 4ab215061554 ("arm64: Add memory hotplug support") > Signed-off-by: Sudarshan Rajagopalan > Signed-off-by: Chris Goldsworthy > Acked-by: David Hildenbrand Tested-by: Georgi Djakov > Cc: Florian Fainelli > Cc: Georgi Djakov > --- > arch/arm64/mm/mmu.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c > index cfd9deb..fd85b51 100644 > --- a/arch/arm64/mm/mmu.c > +++ b/arch/arm64/mm/mmu.c > @@ -1499,6 +1499,11 @@ int arch_add_memory(int nid, u64 start, u64 size, > if (ret) > __remove_pgd_mapping(swapper_pg_dir, > __phys_to_virt(start), size); > + else { > + max_pfn = PFN_UP(start + size); > + max_low_pfn = max_pfn; > + } > + > return ret; > } > >