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[134.134.136.65]) by mx.google.com with ESMTPS id h19si12278998pgb.231.2019.01.24.15.21.57 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 24 Jan 2019 15:21:57 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of dave.hansen@linux.intel.com designates 134.134.136.65 as permitted sender) client-ip=134.134.136.65; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of dave.hansen@linux.intel.com designates 134.134.136.65 as permitted sender) smtp.mailfrom=dave.hansen@linux.intel.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 24 Jan 2019 15:21:56 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,518,1539673200"; d="scan'208";a="109574602" Received: from viggo.jf.intel.com (HELO localhost.localdomain) ([10.54.77.144]) by orsmga007.jf.intel.com with ESMTP; 24 Jan 2019 15:21:56 -0800 Subject: [PATCH 4/5] dax/kmem: let walk_system_ram_range() search child resources To: linux-kernel@vger.kernel.org Cc: Dave Hansen ,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-mm@kvack.org,ying.huang@intel.com,fengguang.wu@intel.com,bp@suse.de,bhelgaas@google.com,baiyaowei@cmss.chinamobile.com,tiwai@suse.de,jglisse@redhat.com From: Dave Hansen Date: Thu, 24 Jan 2019 15:14:47 -0800 References: <20190124231441.37A4A305@viggo.jf.intel.com> In-Reply-To: <20190124231441.37A4A305@viggo.jf.intel.com> Message-Id: <20190124231447.74358AA5@viggo.jf.intel.com> 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: Content-Type: text/plain; charset="UTF-8" Message-ID: <20190124231447.hFv-EQH2817PrVKB5ykVOxys1jbfFOF8_mbIKOgamFw@z> From: Dave Hansen In the process of onlining memory, we use walk_system_ram_range() to find the actual RAM areas inside of the area being onlined. However, it currently only finds memory resources which are "top-level" iomem_resources. Children are not currently searched which causes it to skip System RAM in areas like this (in the format of /proc/iomem): a0000000-bfffffff : Persistent Memory (legacy) a0000000-afffffff : System RAM Changing the true->false here allows children to be searched as well. We need this because we add a new "System RAM" resource underneath the "persistent memory" resource when we use persistent memory in a volatile mode. Signed-off-by: Dave Hansen Cc: Dan Williams Cc: Dave Jiang Cc: Ross Zwisler Cc: Vishal Verma Cc: Tom Lendacky Cc: Andrew Morton Cc: Michal Hocko Cc: linux-nvdimm@lists.01.org Cc: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org Cc: Huang Ying Cc: Fengguang Wu Cc: Borislav Petkov Cc: Bjorn Helgaas Cc: Yaowei Bai Cc: Takashi Iwai Cc: Jerome Glisse --- b/kernel/resource.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff -puN kernel/resource.c~mm-walk_system_ram_range-search-child-resources kernel/resource.c --- a/kernel/resource.c~mm-walk_system_ram_range-search-child-resources 2019-01-24 15:13:15.482199536 -0800 +++ b/kernel/resource.c 2019-01-24 15:13:15.486199536 -0800 @@ -445,6 +445,9 @@ int walk_mem_res(u64 start, u64 end, voi * This function calls the @func callback against all memory ranges of type * System RAM which are marked as IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY. * It is to be used only for System RAM. + * + * This will find System RAM ranges that are children of top-level resources + * in addition to top-level System RAM resources. */ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, void *arg, int (*func)(unsigned long, unsigned long, void *)) @@ -460,7 +463,7 @@ int walk_system_ram_range(unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; while (start < end && !find_next_iomem_res(start, end, flags, IORES_DESC_NONE, - true, &res)) { + false, &res)) { pfn = (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT; end_pfn = (res.end + 1) >> PAGE_SHIFT; if (end_pfn > pfn) _