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Date: Thu, 27 Jan 2022 08:29:34 +0800
From: kernel test robot <lkp@...el.com>
To: Jonghyeon Kim <tome01@...u.ac.kr>, dan.j.williams@...el.com
Cc: kbuild-all@...ts.01.org, vishal.l.verma@...el.com,
dave.jiang@...el.com, akpm@...ux-foundation.org,
nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, Jonghyeon Kim <tome01@...u.ac.kr>
Subject: Re: [PATCH 2/2] dax/kmem: Update spanned page stat of origin device
node
Hi Jonghyeon,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on hnaz-mm/master]
url: https://github.com/0day-ci/linux/commits/Jonghyeon-Kim/mm-memory_hotplug-Export-shrink-span-functions-for-zone-and-node/20220127-010219
base: https://github.com/hnaz/linux-mm master
config: x86_64-randconfig-a002-20220124 (https://download.01.org/0day-ci/archive/20220127/202201270836.H8feaOM9-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://github.com/0day-ci/linux/commit/ef33cc7f7380ddd07a3fedb42f35c1f81de401a4
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Jonghyeon-Kim/mm-memory_hotplug-Export-shrink-span-functions-for-zone-and-node/20220127-010219
git checkout ef33cc7f7380ddd07a3fedb42f35c1f81de401a4
# save the config file to linux build tree
mkdir build_dir
make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/dax/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
drivers/dax/kmem.c: In function 'dev_dax_kmem_probe':
>> drivers/dax/kmem.c:156:42: error: 'ZONE_DEVICE' undeclared (first use in this function)
156 | struct zone *zone = &pgdat->node_zones[ZONE_DEVICE];
| ^~~~~~~~~~~
drivers/dax/kmem.c:156:42: note: each undeclared identifier is reported only once for each function it appears in
vim +/ZONE_DEVICE +156 drivers/dax/kmem.c
44
45 static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
46 {
47 struct device *dev = &dev_dax->dev;
48 unsigned long total_len = 0;
49 struct dax_kmem_data *data;
50 int i, rc, mapped = 0;
51 int numa_node;
52 int dev_node;
53
54 /*
55 * Ensure good NUMA information for the persistent memory.
56 * Without this check, there is a risk that slow memory
57 * could be mixed in a node with faster memory, causing
58 * unavoidable performance issues.
59 */
60 numa_node = dev_dax->target_node;
61 if (numa_node < 0) {
62 dev_warn(dev, "rejecting DAX region with invalid node: %d\n",
63 numa_node);
64 return -EINVAL;
65 }
66
67 for (i = 0; i < dev_dax->nr_range; i++) {
68 struct range range;
69
70 rc = dax_kmem_range(dev_dax, i, &range);
71 if (rc) {
72 dev_info(dev, "mapping%d: %#llx-%#llx too small after alignment\n",
73 i, range.start, range.end);
74 continue;
75 }
76 total_len += range_len(&range);
77 }
78
79 if (!total_len) {
80 dev_warn(dev, "rejecting DAX region without any memory after alignment\n");
81 return -EINVAL;
82 }
83
84 data = kzalloc(struct_size(data, res, dev_dax->nr_range), GFP_KERNEL);
85 if (!data)
86 return -ENOMEM;
87
88 rc = -ENOMEM;
89 data->res_name = kstrdup(dev_name(dev), GFP_KERNEL);
90 if (!data->res_name)
91 goto err_res_name;
92
93 rc = memory_group_register_static(numa_node, total_len);
94 if (rc < 0)
95 goto err_reg_mgid;
96 data->mgid = rc;
97
98 for (i = 0; i < dev_dax->nr_range; i++) {
99 struct resource *res;
100 struct range range;
101
102 rc = dax_kmem_range(dev_dax, i, &range);
103 if (rc)
104 continue;
105
106 /* Region is permanently reserved if hotremove fails. */
107 res = request_mem_region(range.start, range_len(&range), data->res_name);
108 if (!res) {
109 dev_warn(dev, "mapping%d: %#llx-%#llx could not reserve region\n",
110 i, range.start, range.end);
111 /*
112 * Once some memory has been onlined we can't
113 * assume that it can be un-onlined safely.
114 */
115 if (mapped)
116 continue;
117 rc = -EBUSY;
118 goto err_request_mem;
119 }
120 data->res[i] = res;
121
122 /*
123 * Set flags appropriate for System RAM. Leave ..._BUSY clear
124 * so that add_memory() can add a child resource. Do not
125 * inherit flags from the parent since it may set new flags
126 * unknown to us that will break add_memory() below.
127 */
128 res->flags = IORESOURCE_SYSTEM_RAM;
129
130 /*
131 * Ensure that future kexec'd kernels will not treat
132 * this as RAM automatically.
133 */
134 rc = add_memory_driver_managed(data->mgid, range.start,
135 range_len(&range), kmem_name, MHP_NID_IS_MGID);
136
137 if (rc) {
138 dev_warn(dev, "mapping%d: %#llx-%#llx memory add failed\n",
139 i, range.start, range.end);
140 release_resource(res);
141 kfree(res);
142 data->res[i] = NULL;
143 if (mapped)
144 continue;
145 goto err_request_mem;
146 }
147 mapped++;
148 }
149
150 dev_set_drvdata(dev, data);
151
152 /* Update spanned_pages of the device numa node */
153 dev_node = dev_to_node(dev);
154 if (dev_node != numa_node && dev_node < numa_node) {
155 struct pglist_data *pgdat = NODE_DATA(dev_node);
> 156 struct zone *zone = &pgdat->node_zones[ZONE_DEVICE];
157 unsigned long start_pfn = zone->zone_start_pfn;
158 unsigned long nr_pages = NODE_DATA(numa_node)->node_spanned_pages;
159
160 shrink_zone_span(zone, start_pfn, start_pfn + nr_pages);
161 update_pgdat_span(pgdat);
162 }
163
164 return 0;
165
166 err_request_mem:
167 memory_group_unregister(data->mgid);
168 err_reg_mgid:
169 kfree(data->res_name);
170 err_res_name:
171 kfree(data);
172 return rc;
173 }
174
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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