tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 571d71e886a5edc89b4ea6d0fe6f445282938320 commit: be23cb8e7a96c4ae97a35cd99f993e98d9bd66a5 [5938/6538] zswap: do not shrink if cgroup may not zswap config: hexagon-randconfig-r045-20230531 (https://download.01.org/0day-ci/archive/20230601/202306011435.2BxsHFUE-lkp@xxxxxxxxx/config) compiler: clang version 15.0.4 (https://github.com/llvm/llvm-project 5c68a1cb123161b54b72ce90e7975d95a8eaf2a4) reproduce (this is a W=1 build): mkdir -p ~/bin wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=be23cb8e7a96c4ae97a35cd99f993e98d9bd66a5 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout be23cb8e7a96c4ae97a35cd99f993e98d9bd66a5 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202306011435.2BxsHFUE-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from mm/zswap.c:18: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from mm/zswap.c:18: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from mm/zswap.c:18: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ >> mm/zswap.c:1183:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (objcg && !obj_cgroup_may_zswap(objcg)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/zswap.c:1327:9: note: uninitialized use occurs here return ret; ^~~ mm/zswap.c:1183:2: note: remove the 'if' if its condition is always false if (objcg && !obj_cgroup_may_zswap(objcg)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/zswap.c:1158:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 7 warnings generated. vim +1183 mm/zswap.c a85f878b443f8d Srividya Desireddy 2018-01-31 1144 2b2811178e8555 Seth Jennings 2013-07-10 1145 /********************************* 2b2811178e8555 Seth Jennings 2013-07-10 1146 * frontswap hooks 2b2811178e8555 Seth Jennings 2013-07-10 1147 **********************************/ 2b2811178e8555 Seth Jennings 2013-07-10 1148 /* attempts to compress and store an single page */ 2b2811178e8555 Seth Jennings 2013-07-10 1149 static int zswap_frontswap_store(unsigned type, pgoff_t offset, 2b2811178e8555 Seth Jennings 2013-07-10 1150 struct page *page) 2b2811178e8555 Seth Jennings 2013-07-10 1151 { 2b2811178e8555 Seth Jennings 2013-07-10 1152 struct zswap_tree *tree = zswap_trees[type]; 2b2811178e8555 Seth Jennings 2013-07-10 1153 struct zswap_entry *entry, *dupentry; 1ec3b5fe6eec78 Barry Song 2020-12-14 1154 struct scatterlist input, output; 1ec3b5fe6eec78 Barry Song 2020-12-14 1155 struct crypto_acomp_ctx *acomp_ctx; f4840ccfca25db Johannes Weiner 2022-05-19 1156 struct obj_cgroup *objcg = NULL; f4840ccfca25db Johannes Weiner 2022-05-19 1157 struct zswap_pool *pool; 2b2811178e8555 Seth Jennings 2013-07-10 1158 int ret; 9c3760eb80880f Yu Zhao 2018-01-31 1159 unsigned int hlen, dlen = PAGE_SIZE; a85f878b443f8d Srividya Desireddy 2018-01-31 1160 unsigned long handle, value; 2b2811178e8555 Seth Jennings 2013-07-10 1161 char *buf; 2b2811178e8555 Seth Jennings 2013-07-10 1162 u8 *src, *dst; 9c3760eb80880f Yu Zhao 2018-01-31 1163 struct zswap_header zhdr = { .swpentry = swp_entry(type, offset) }; d2fcd82bb83aab Hui Zhu 2019-09-23 1164 gfp_t gfp; 2b2811178e8555 Seth Jennings 2013-07-10 1165 7ba716698cc53f Huang Ying 2018-02-21 1166 /* THP isn't supported */ 7ba716698cc53f Huang Ying 2018-02-21 1167 if (PageTransHuge(page)) { 7ba716698cc53f Huang Ying 2018-02-21 1168 ret = -EINVAL; 7ba716698cc53f Huang Ying 2018-02-21 1169 goto reject; 7ba716698cc53f Huang Ying 2018-02-21 1170 } 7ba716698cc53f Huang Ying 2018-02-21 1171 c00ed16a9eb98a Dan Streetman 2015-06-25 1172 if (!zswap_enabled || !tree) { 2b2811178e8555 Seth Jennings 2013-07-10 1173 ret = -ENODEV; 2b2811178e8555 Seth Jennings 2013-07-10 1174 goto reject; 2b2811178e8555 Seth Jennings 2013-07-10 1175 } 2b2811178e8555 Seth Jennings 2013-07-10 1176 be23cb8e7a96c4 Nhat Pham 2023-05-30 1177 /* be23cb8e7a96c4 Nhat Pham 2023-05-30 1178 * XXX: zswap reclaim does not work with cgroups yet. Without a be23cb8e7a96c4 Nhat Pham 2023-05-30 1179 * cgroup-aware entry LRU, we will push out entries system-wide based on be23cb8e7a96c4 Nhat Pham 2023-05-30 1180 * local cgroup limits. be23cb8e7a96c4 Nhat Pham 2023-05-30 1181 */ f4840ccfca25db Johannes Weiner 2022-05-19 1182 objcg = get_obj_cgroup_from_page(page); f4840ccfca25db Johannes Weiner 2022-05-19 @1183 if (objcg && !obj_cgroup_may_zswap(objcg)) be23cb8e7a96c4 Nhat Pham 2023-05-30 1184 goto reject; f4840ccfca25db Johannes Weiner 2022-05-19 1185 2b2811178e8555 Seth Jennings 2013-07-10 1186 /* reclaim space if needed */ 2b2811178e8555 Seth Jennings 2013-07-10 1187 if (zswap_is_full()) { 2b2811178e8555 Seth Jennings 2013-07-10 1188 zswap_pool_limit_hit++; 45190f01dd4021 Vitaly Wool 2020-01-30 1189 zswap_pool_reached_full = true; f4840ccfca25db Johannes Weiner 2022-05-19 1190 goto shrink; 2b2811178e8555 Seth Jennings 2013-07-10 1191 } 16e536ef47f567 Li Wang 2018-07-26 1192 45190f01dd4021 Vitaly Wool 2020-01-30 1193 if (zswap_pool_reached_full) { 45190f01dd4021 Vitaly Wool 2020-01-30 1194 if (!zswap_can_accept()) { 16e536ef47f567 Li Wang 2018-07-26 1195 ret = -ENOMEM; 16e536ef47f567 Li Wang 2018-07-26 1196 goto reject; 45190f01dd4021 Vitaly Wool 2020-01-30 1197 } else 45190f01dd4021 Vitaly Wool 2020-01-30 1198 zswap_pool_reached_full = false; 2b2811178e8555 Seth Jennings 2013-07-10 1199 } 2b2811178e8555 Seth Jennings 2013-07-10 1200 2b2811178e8555 Seth Jennings 2013-07-10 1201 /* allocate entry */ 2b2811178e8555 Seth Jennings 2013-07-10 1202 entry = zswap_entry_cache_alloc(GFP_KERNEL); 2b2811178e8555 Seth Jennings 2013-07-10 1203 if (!entry) { 2b2811178e8555 Seth Jennings 2013-07-10 1204 zswap_reject_kmemcache_fail++; 2b2811178e8555 Seth Jennings 2013-07-10 1205 ret = -ENOMEM; 2b2811178e8555 Seth Jennings 2013-07-10 1206 goto reject; 2b2811178e8555 Seth Jennings 2013-07-10 1207 } 2b2811178e8555 Seth Jennings 2013-07-10 1208 a85f878b443f8d Srividya Desireddy 2018-01-31 1209 if (zswap_same_filled_pages_enabled) { a85f878b443f8d Srividya Desireddy 2018-01-31 1210 src = kmap_atomic(page); a85f878b443f8d Srividya Desireddy 2018-01-31 1211 if (zswap_is_page_same_filled(src, &value)) { a85f878b443f8d Srividya Desireddy 2018-01-31 1212 kunmap_atomic(src); a85f878b443f8d Srividya Desireddy 2018-01-31 1213 entry->offset = offset; a85f878b443f8d Srividya Desireddy 2018-01-31 1214 entry->length = 0; a85f878b443f8d Srividya Desireddy 2018-01-31 1215 entry->value = value; a85f878b443f8d Srividya Desireddy 2018-01-31 1216 atomic_inc(&zswap_same_filled_pages); a85f878b443f8d Srividya Desireddy 2018-01-31 1217 goto insert_entry; a85f878b443f8d Srividya Desireddy 2018-01-31 1218 } a85f878b443f8d Srividya Desireddy 2018-01-31 1219 kunmap_atomic(src); a85f878b443f8d Srividya Desireddy 2018-01-31 1220 } a85f878b443f8d Srividya Desireddy 2018-01-31 1221 cb325ddde56162 Maciej S. Szmigiero 2022-03-22 1222 if (!zswap_non_same_filled_pages_enabled) { cb325ddde56162 Maciej S. Szmigiero 2022-03-22 1223 ret = -EINVAL; cb325ddde56162 Maciej S. Szmigiero 2022-03-22 1224 goto freepage; cb325ddde56162 Maciej S. Szmigiero 2022-03-22 1225 } cb325ddde56162 Maciej S. Szmigiero 2022-03-22 1226 f1c54846ee4504 Dan Streetman 2015-09-09 1227 /* if entry is successfully added, it keeps the reference */ f1c54846ee4504 Dan Streetman 2015-09-09 1228 entry->pool = zswap_pool_current_get(); f1c54846ee4504 Dan Streetman 2015-09-09 1229 if (!entry->pool) { f1c54846ee4504 Dan Streetman 2015-09-09 1230 ret = -EINVAL; f1c54846ee4504 Dan Streetman 2015-09-09 1231 goto freepage; f1c54846ee4504 Dan Streetman 2015-09-09 1232 } f1c54846ee4504 Dan Streetman 2015-09-09 1233 2b2811178e8555 Seth Jennings 2013-07-10 1234 /* compress */ 1ec3b5fe6eec78 Barry Song 2020-12-14 1235 acomp_ctx = raw_cpu_ptr(entry->pool->acomp_ctx); 1ec3b5fe6eec78 Barry Song 2020-12-14 1236 1ec3b5fe6eec78 Barry Song 2020-12-14 1237 mutex_lock(acomp_ctx->mutex); 1ec3b5fe6eec78 Barry Song 2020-12-14 1238 1ec3b5fe6eec78 Barry Song 2020-12-14 1239 dst = acomp_ctx->dstmem; 1ec3b5fe6eec78 Barry Song 2020-12-14 1240 sg_init_table(&input, 1); 1ec3b5fe6eec78 Barry Song 2020-12-14 1241 sg_set_page(&input, page, PAGE_SIZE, 0); 1ec3b5fe6eec78 Barry Song 2020-12-14 1242 1ec3b5fe6eec78 Barry Song 2020-12-14 1243 /* zswap_dstmem is of size (PAGE_SIZE * 2). Reflect same in sg_list */ 1ec3b5fe6eec78 Barry Song 2020-12-14 1244 sg_init_one(&output, dst, PAGE_SIZE * 2); 1ec3b5fe6eec78 Barry Song 2020-12-14 1245 acomp_request_set_params(acomp_ctx->req, &input, &output, PAGE_SIZE, dlen); 1ec3b5fe6eec78 Barry Song 2020-12-14 1246 /* 1ec3b5fe6eec78 Barry Song 2020-12-14 1247 * it maybe looks a little bit silly that we send an asynchronous request, 1ec3b5fe6eec78 Barry Song 2020-12-14 1248 * then wait for its completion synchronously. This makes the process look 1ec3b5fe6eec78 Barry Song 2020-12-14 1249 * synchronous in fact. 1ec3b5fe6eec78 Barry Song 2020-12-14 1250 * Theoretically, acomp supports users send multiple acomp requests in one 1ec3b5fe6eec78 Barry Song 2020-12-14 1251 * acomp instance, then get those requests done simultaneously. but in this 1ec3b5fe6eec78 Barry Song 2020-12-14 1252 * case, frontswap actually does store and load page by page, there is no 1ec3b5fe6eec78 Barry Song 2020-12-14 1253 * existing method to send the second page before the first page is done 1ec3b5fe6eec78 Barry Song 2020-12-14 1254 * in one thread doing frontswap. 1ec3b5fe6eec78 Barry Song 2020-12-14 1255 * but in different threads running on different cpu, we have different 1ec3b5fe6eec78 Barry Song 2020-12-14 1256 * acomp instance, so multiple threads can do (de)compression in parallel. 1ec3b5fe6eec78 Barry Song 2020-12-14 1257 */ 1ec3b5fe6eec78 Barry Song 2020-12-14 1258 ret = crypto_wait_req(crypto_acomp_compress(acomp_ctx->req), &acomp_ctx->wait); 1ec3b5fe6eec78 Barry Song 2020-12-14 1259 dlen = acomp_ctx->req->dlen; 1ec3b5fe6eec78 Barry Song 2020-12-14 1260 2b2811178e8555 Seth Jennings 2013-07-10 1261 if (ret) { 2b2811178e8555 Seth Jennings 2013-07-10 1262 ret = -EINVAL; f1c54846ee4504 Dan Streetman 2015-09-09 1263 goto put_dstmem; 2b2811178e8555 Seth Jennings 2013-07-10 1264 } 2b2811178e8555 Seth Jennings 2013-07-10 1265 2b2811178e8555 Seth Jennings 2013-07-10 1266 /* store */ 9c3760eb80880f Yu Zhao 2018-01-31 1267 hlen = zpool_evictable(entry->pool->zpool) ? sizeof(zhdr) : 0; d2fcd82bb83aab Hui Zhu 2019-09-23 1268 gfp = __GFP_NORETRY | __GFP_NOWARN | __GFP_KSWAPD_RECLAIM; d2fcd82bb83aab Hui Zhu 2019-09-23 1269 if (zpool_malloc_support_movable(entry->pool->zpool)) d2fcd82bb83aab Hui Zhu 2019-09-23 1270 gfp |= __GFP_HIGHMEM | __GFP_MOVABLE; d2fcd82bb83aab Hui Zhu 2019-09-23 1271 ret = zpool_malloc(entry->pool->zpool, hlen + dlen, gfp, &handle); 2b2811178e8555 Seth Jennings 2013-07-10 1272 if (ret == -ENOSPC) { 2b2811178e8555 Seth Jennings 2013-07-10 1273 zswap_reject_compress_poor++; f1c54846ee4504 Dan Streetman 2015-09-09 1274 goto put_dstmem; 2b2811178e8555 Seth Jennings 2013-07-10 1275 } 2b2811178e8555 Seth Jennings 2013-07-10 1276 if (ret) { 2b2811178e8555 Seth Jennings 2013-07-10 1277 zswap_reject_alloc_fail++; f1c54846ee4504 Dan Streetman 2015-09-09 1278 goto put_dstmem; 2b2811178e8555 Seth Jennings 2013-07-10 1279 } ae34af1f11d0a6 Miaohe Lin 2021-06-30 1280 buf = zpool_map_handle(entry->pool->zpool, handle, ZPOOL_MM_WO); 9c3760eb80880f Yu Zhao 2018-01-31 1281 memcpy(buf, &zhdr, hlen); 9c3760eb80880f Yu Zhao 2018-01-31 1282 memcpy(buf + hlen, dst, dlen); f1c54846ee4504 Dan Streetman 2015-09-09 1283 zpool_unmap_handle(entry->pool->zpool, handle); 1ec3b5fe6eec78 Barry Song 2020-12-14 1284 mutex_unlock(acomp_ctx->mutex); 2b2811178e8555 Seth Jennings 2013-07-10 1285 2b2811178e8555 Seth Jennings 2013-07-10 1286 /* populate entry */ 2b2811178e8555 Seth Jennings 2013-07-10 1287 entry->offset = offset; 2b2811178e8555 Seth Jennings 2013-07-10 1288 entry->handle = handle; 2b2811178e8555 Seth Jennings 2013-07-10 1289 entry->length = dlen; 2b2811178e8555 Seth Jennings 2013-07-10 1290 a85f878b443f8d Srividya Desireddy 2018-01-31 1291 insert_entry: f4840ccfca25db Johannes Weiner 2022-05-19 1292 entry->objcg = objcg; f4840ccfca25db Johannes Weiner 2022-05-19 1293 if (objcg) { f4840ccfca25db Johannes Weiner 2022-05-19 1294 obj_cgroup_charge_zswap(objcg, entry->length); f4840ccfca25db Johannes Weiner 2022-05-19 1295 /* Account before objcg ref is moved to tree */ f4840ccfca25db Johannes Weiner 2022-05-19 1296 count_objcg_event(objcg, ZSWPOUT); f4840ccfca25db Johannes Weiner 2022-05-19 1297 } f4840ccfca25db Johannes Weiner 2022-05-19 1298 2b2811178e8555 Seth Jennings 2013-07-10 1299 /* map */ 2b2811178e8555 Seth Jennings 2013-07-10 1300 spin_lock(&tree->lock); 2b2811178e8555 Seth Jennings 2013-07-10 1301 do { 2b2811178e8555 Seth Jennings 2013-07-10 1302 ret = zswap_rb_insert(&tree->rbroot, entry, &dupentry); 2b2811178e8555 Seth Jennings 2013-07-10 1303 if (ret == -EEXIST) { 2b2811178e8555 Seth Jennings 2013-07-10 1304 zswap_duplicate_entry++; 2b2811178e8555 Seth Jennings 2013-07-10 1305 /* remove from rbtree */ 0ab0abcf511545 Weijie Yang 2013-11-12 1306 zswap_rb_erase(&tree->rbroot, dupentry); 0ab0abcf511545 Weijie Yang 2013-11-12 1307 zswap_entry_put(tree, dupentry); 2b2811178e8555 Seth Jennings 2013-07-10 1308 } 2b2811178e8555 Seth Jennings 2013-07-10 1309 } while (ret == -EEXIST); 2b2811178e8555 Seth Jennings 2013-07-10 1310 spin_unlock(&tree->lock); 2b2811178e8555 Seth Jennings 2013-07-10 1311 2b2811178e8555 Seth Jennings 2013-07-10 1312 /* update stats */ 2b2811178e8555 Seth Jennings 2013-07-10 1313 atomic_inc(&zswap_stored_pages); f1c54846ee4504 Dan Streetman 2015-09-09 1314 zswap_update_total_size(); f6498b776d280b Johannes Weiner 2022-05-19 1315 count_vm_event(ZSWPOUT); 2b2811178e8555 Seth Jennings 2013-07-10 1316 2b2811178e8555 Seth Jennings 2013-07-10 1317 return 0; 2b2811178e8555 Seth Jennings 2013-07-10 1318 f1c54846ee4504 Dan Streetman 2015-09-09 1319 put_dstmem: 1ec3b5fe6eec78 Barry Song 2020-12-14 1320 mutex_unlock(acomp_ctx->mutex); f1c54846ee4504 Dan Streetman 2015-09-09 1321 zswap_pool_put(entry->pool); f1c54846ee4504 Dan Streetman 2015-09-09 1322 freepage: 2b2811178e8555 Seth Jennings 2013-07-10 1323 zswap_entry_cache_free(entry); 2b2811178e8555 Seth Jennings 2013-07-10 1324 reject: f4840ccfca25db Johannes Weiner 2022-05-19 1325 if (objcg) f4840ccfca25db Johannes Weiner 2022-05-19 1326 obj_cgroup_put(objcg); 2b2811178e8555 Seth Jennings 2013-07-10 1327 return ret; f4840ccfca25db Johannes Weiner 2022-05-19 1328 f4840ccfca25db Johannes Weiner 2022-05-19 1329 shrink: f4840ccfca25db Johannes Weiner 2022-05-19 1330 pool = zswap_pool_last_get(); f4840ccfca25db Johannes Weiner 2022-05-19 1331 if (pool) f4840ccfca25db Johannes Weiner 2022-05-19 1332 queue_work(shrink_wq, &pool->shrink_work); f4840ccfca25db Johannes Weiner 2022-05-19 1333 ret = -ENOMEM; f4840ccfca25db Johannes Weiner 2022-05-19 1334 goto reject; 2b2811178e8555 Seth Jennings 2013-07-10 1335 } 2b2811178e8555 Seth Jennings 2013-07-10 1336 :::::: The code at line 1183 was first introduced by commit :::::: f4840ccfca25db225b3371a8f7b5770febee87c5 zswap: memcg accounting :::::: TO: Johannes Weiner <hannes@xxxxxxxxxxx> :::::: CC: akpm <akpm@xxxxxxxxxxxxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
