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23 Jan 2019 12:03:54 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,513,1539673200"; d="scan'208";a="112115782" Received: from ray.jf.intel.com (HELO [10.7.201.139]) ([10.7.201.139]) by orsmga008.jf.intel.com with ESMTP; 23 Jan 2019 12:03:54 -0800 Subject: Re: [PATCH 2/4] mm/memory-hotplug: allow memory resources to be children To: Jerome Glisse Cc: Dave Hansen , dave@sr71.net, dan.j.williams@intel.com, dave.jiang@intel.com, zwisler@kernel.org, vishal.l.verma@intel.com, thomas.lendacky@amd.com, akpm@linux-foundation.org, mhocko@suse.com, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ying.huang@intel.com, fengguang.wu@intel.com, bp@suse.de, bhelgaas@google.com, baiyaowei@cmss.chinamobile.com, tiwai@suse.de References: <20190116181859.D1504459@viggo.jf.intel.com> <20190116181902.670EEBC3@viggo.jf.intel.com> <20190116191635.GD3617@redhat.com> <2b52778d-f120-eec7-3e7a-3a9c182170f0@intel.com> <20190116233849.GE3617@redhat.com> From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: <20190116233849.GE3617@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/16/19 3:38 PM, Jerome Glisse wrote: > So right now i would rather that we keep properly reporting this > hazard so that at least we know it failed because of that. This > also include making sure that we can not register private memory > as a child of an un-busy resource that does exist but might not > have yet been claim by its rightful owner. I can definitely keep the warning in. But, I don't think there's a chance of HMM registering a IORES_DESC_DEVICE_PRIVATE_MEMORY region as the child of another. The region_intersects() check *should* find that: > for (; addr > size && addr >= iomem_resource.start; addr -= size) { > ret = region_intersects(addr, size, 0, IORES_DESC_NONE); > if (ret != REGION_DISJOINT) > continue;