Hi Paulo, First bad commit (maybe != root cause): tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 8ef0a44ca2d0533e47597c06656a95d56aecc0c3 commit: 71e217e85c3dff8a9151707ed3afc7b4b054a2d4 [1646/1646] selinux: use kernel linux/socket.h for genheaders and mdp config: x86_64-buildonly-randconfig-002-20250520 (https://download.01.org/0day-ci/archive/20250520/202505201642.9kWf73yF-lkp@i...) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250520/202505201642.9kWf73yF-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202505201642.9kWf73yF-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

mm/khugepaged.c:1307: warning: Function parameter or member 'mm' not described in 'collapse_shmem' mm/khugepaged.c:1307: warning: Function parameter or member 'mapping' not described in 'collapse_shmem' mm/khugepaged.c:1307: warning: Function parameter or member 'start' not described in 'collapse_shmem' mm/khugepaged.c:1307: warning: Function parameter or member 'hpage' not described in 'collapse_shmem' mm/khugepaged.c:1307: warning: Function parameter or member 'node' not described in 'collapse_shmem' mm/khugepaged.o: warning: objtool: start_stop_khugepaged()+0x185: sibling call from callable instruction with modified stack frame mm/khugepaged.o: warning: objtool: start_stop_khugepaged.cold()+0x0: call without frame pointer save/setup -- mm/huge_memory.c:501:15: warning: no previous prototype for '__thp_get_unmapped_area' [-Wmissing-prototypes] 501 | unsigned long __thp_get_unmapped_area(struct file *filp, unsigned long len, | ^~~~~~~~~~~~~~~~~~~~~~~ mm/huge_memory.c: In function 'zap_huge_pud': mm/huge_memory.c:1997:15: warning: variable 'orig_pud' set but not used [-Wunused-but-set-variable] 1997 | pud_t orig_pud; | ^~~~~~~~ mm/huge_memory.o: warning: objtool: split_huge_pages_set.part.0()+0x23: sibling call from callable instruction with modified stack frame mm/huge_memory.o: warning: objtool: split_huge_pages_set.part.0.cold()+0xa: call without frame pointer save/setup -- In file included from include/linux/page_counter.h:6, from mm/memcontrol.c:34: mm/memcontrol.c: In function 'mem_cgroup_get_max': include/linux/kernel.h:879:45: warning: comparison of unsigned expression in '< 0' is always false [-Wtype-limits] 879 | #define min(x, y) __careful_cmp(x, y, <) | ^ include/linux/kernel.h:862:30: note: in definition of macro '__cmp' 862 | #define __cmp(x, y, op) ((x) op (y) ? (x) : (y)) | ^~ include/linux/kernel.h:879:25: note: in expansion of macro '__careful_cmp' 879 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ mm/memcontrol.c:1373:28: note: in expansion of macro 'min' 1373 | swap_max = min(swap_max, (unsigned long)total_swap_pages); | ^~~ mm/memcontrol.c:5790: warning: bad line: | 0, otherwise. mm/memcontrol.o: warning: objtool: mem_cgroup_print_oom_info()+0x3a: sibling call from callable instruction with modified stack frame mm/memcontrol.o: warning: objtool: mem_cgroup_print_oom_info.cold()+0x7: call without frame pointer save/setup

vim +1307 mm/khugepaged.c f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1285 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1286 /** f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1287 * collapse_shmem - collapse small tmpfs/shmem pages into huge one. f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1288 * f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1289 * Basic scheme is simple, details are more complex: af24c01831e4e2 Hugh Dickins 2018-11-30 1290 * - allocate and lock a new huge page; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1291 * - scan over radix tree replacing old pages the new one f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1292 * + swap in pages if necessary; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1293 * + fill in gaps; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1294 * + keep old pages around in case if rollback is required; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1295 * - if replacing succeed: f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1296 * + copy data over; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1297 * + free old pages; af24c01831e4e2 Hugh Dickins 2018-11-30 1298 * + unlock huge page; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1299 * - if replacing failed; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1300 * + put all pages back and unfreeze them; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1301 * + restore gaps in the radix-tree; af24c01831e4e2 Hugh Dickins 2018-11-30 1302 * + unlock and free huge page; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1303 */ f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1304 static void collapse_shmem(struct mm_struct *mm, f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1305 struct address_space *mapping, pgoff_t start, f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1306 struct page **hpage, int node) f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 @1307 { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1308 gfp_t gfp; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1309 struct page *page, *new_page, *tmp; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1310 struct mem_cgroup *memcg; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1311 pgoff_t index, end = start + HPAGE_PMD_NR; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1312 LIST_HEAD(pagelist); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1313 struct radix_tree_iter iter; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1314 void **slot; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1315 int nr_none = 0, result = SCAN_SUCCEED; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1316 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1317 VM_BUG_ON(start & (HPAGE_PMD_NR - 1)); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1318 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1319 /* Only allocate from the target node */ 41b6167e8f746b Michal Hocko 2017-01-10 1320 gfp = alloc_hugepage_khugepaged_gfpmask() | __GFP_THISNODE; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1321 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1322 new_page = khugepaged_alloc_page(hpage, gfp, node); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1323 if (!new_page) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1324 result = SCAN_ALLOC_HUGE_PAGE_FAIL; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1325 goto out; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1326 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1327 2a70f6a76bb86d Michal Hocko 2018-04-10 1328 if (unlikely(mem_cgroup_try_charge(new_page, mm, gfp, &memcg, true))) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1329 result = SCAN_CGROUP_CHARGE_FAIL; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1330 goto out; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1331 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1332 3e9646c76cb91d Hugh Dickins 2018-11-30 1333 __SetPageLocked(new_page); 3e9646c76cb91d Hugh Dickins 2018-11-30 1334 __SetPageSwapBacked(new_page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1335 new_page->index = start; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1336 new_page->mapping = mapping; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1337 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1338 /* af24c01831e4e2 Hugh Dickins 2018-11-30 1339 * At this point the new_page is locked and not up-to-date. af24c01831e4e2 Hugh Dickins 2018-11-30 1340 * It's safe to insert it into the page cache, because nobody would af24c01831e4e2 Hugh Dickins 2018-11-30 1341 * be able to map it or use it in another way until we unlock it. f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1342 */ f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1343 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1344 index = start; b93b016313b3ba Matthew Wilcox 2018-04-10 1345 xa_lock_irq(&mapping->i_pages); b93b016313b3ba Matthew Wilcox 2018-04-10 1346 radix_tree_for_each_slot(slot, &mapping->i_pages, &iter, start) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1347 int n = min(iter.index, end) - index; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1348 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1349 /* 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1350 * Stop if extent has been hole-punched, and is now completely 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1351 * empty (the more obvious i_size_read() check would take an 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1352 * irq-unsafe seqlock on 32-bit). 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1353 */ 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1354 if (n >= HPAGE_PMD_NR) { 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1355 result = SCAN_TRUNCATED; 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1356 goto tree_locked; 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1357 } 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1358 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1359 /* f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1360 * Handle holes in the radix tree: charge it from shmem and f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1361 * insert relevant subpage of new_page into the radix-tree. f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1362 */ f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1363 if (n && !shmem_charge(mapping->host, n)) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1364 result = SCAN_FAIL; 3e9646c76cb91d Hugh Dickins 2018-11-30 1365 goto tree_locked; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1366 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1367 for (; index < min(iter.index, end); index++) { b93b016313b3ba Matthew Wilcox 2018-04-10 1368 radix_tree_insert(&mapping->i_pages, index, f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1369 new_page + (index % HPAGE_PMD_NR)); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1370 } 3e9646c76cb91d Hugh Dickins 2018-11-30 1371 nr_none += n; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1372 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1373 /* We are done. */ f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1374 if (index >= end) f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1375 break; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1376 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1377 page = radix_tree_deref_slot_protected(slot, b93b016313b3ba Matthew Wilcox 2018-04-10 1378 &mapping->i_pages.xa_lock); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1379 if (radix_tree_exceptional_entry(page) || !PageUptodate(page)) { b93b016313b3ba Matthew Wilcox 2018-04-10 1380 xa_unlock_irq(&mapping->i_pages); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1381 /* swap in or instantiate fallocated page */ f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1382 if (shmem_getpage(mapping->host, index, &page, f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1383 SGP_NOHUGE)) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1384 result = SCAN_FAIL; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1385 goto tree_unlocked; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1386 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1387 } else if (trylock_page(page)) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1388 get_page(page); 3e9646c76cb91d Hugh Dickins 2018-11-30 1389 xa_unlock_irq(&mapping->i_pages); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1390 } else { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1391 result = SCAN_PAGE_LOCK; 3e9646c76cb91d Hugh Dickins 2018-11-30 1392 goto tree_locked; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1393 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1394 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1395 /* b93b016313b3ba Matthew Wilcox 2018-04-10 1396 * The page must be locked, so we can drop the i_pages lock f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1397 * without racing with truncate. f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1398 */ f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1399 VM_BUG_ON_PAGE(!PageLocked(page), page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1400 VM_BUG_ON_PAGE(!PageUptodate(page), page); 8b37c40503eadc Hugh Dickins 2018-11-30 1401 8b37c40503eadc Hugh Dickins 2018-11-30 1402 /* 8b37c40503eadc Hugh Dickins 2018-11-30 1403 * If file was truncated then extended, or hole-punched, before 8b37c40503eadc Hugh Dickins 2018-11-30 1404 * we locked the first page, then a THP might be there already. 8b37c40503eadc Hugh Dickins 2018-11-30 1405 */ 8b37c40503eadc Hugh Dickins 2018-11-30 1406 if (PageTransCompound(page)) { 8b37c40503eadc Hugh Dickins 2018-11-30 1407 result = SCAN_PAGE_COMPOUND; 8b37c40503eadc Hugh Dickins 2018-11-30 1408 goto out_unlock; 8b37c40503eadc Hugh Dickins 2018-11-30 1409 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1410 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1411 if (page_mapping(page) != mapping) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1412 result = SCAN_TRUNCATED; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1413 goto out_unlock; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1414 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1415 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1416 if (isolate_lru_page(page)) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1417 result = SCAN_DEL_PAGE_LRU; 3e9646c76cb91d Hugh Dickins 2018-11-30 1418 goto out_unlock; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1419 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1420 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1421 if (page_mapped(page)) 977fbdcd5986c9 Matthew Wilcox 2018-01-31 1422 unmap_mapping_pages(mapping, index, 1, false); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1423 b93b016313b3ba Matthew Wilcox 2018-04-10 1424 xa_lock_irq(&mapping->i_pages); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1425 b93b016313b3ba Matthew Wilcox 2018-04-10 1426 slot = radix_tree_lookup_slot(&mapping->i_pages, index); 91a45f71078a65 Johannes Weiner 2016-12-12 1427 VM_BUG_ON_PAGE(page != radix_tree_deref_slot_protected(slot, b93b016313b3ba Matthew Wilcox 2018-04-10 1428 &mapping->i_pages.xa_lock), page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1429 VM_BUG_ON_PAGE(page_mapped(page), page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1430 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1431 /* f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1432 * The page is expected to have page_count() == 3: f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1433 * - we hold a pin on it; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1434 * - one reference from radix tree; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1435 * - one from isolate_lru_page; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1436 */ f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1437 if (!page_ref_freeze(page, 3)) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1438 result = SCAN_PAGE_COUNT; 3e9646c76cb91d Hugh Dickins 2018-11-30 1439 xa_unlock_irq(&mapping->i_pages); 3e9646c76cb91d Hugh Dickins 2018-11-30 1440 putback_lru_page(page); 3e9646c76cb91d Hugh Dickins 2018-11-30 1441 goto out_unlock; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1442 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1443 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1444 /* f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1445 * Add the page to the list to be able to undo the collapse if f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1446 * something go wrong. f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1447 */ f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1448 list_add_tail(&page->lru, &pagelist); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1449 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1450 /* Finally, replace with the new page. */ b93b016313b3ba Matthew Wilcox 2018-04-10 1451 radix_tree_replace_slot(&mapping->i_pages, slot, f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1452 new_page + (index % HPAGE_PMD_NR)); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1453 148deab223b237 Matthew Wilcox 2016-12-14 1454 slot = radix_tree_iter_resume(slot, &iter); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1455 index++; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1456 continue; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1457 out_unlock: f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1458 unlock_page(page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1459 put_page(page); 3e9646c76cb91d Hugh Dickins 2018-11-30 1460 goto tree_unlocked; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1461 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1462 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1463 /* f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1464 * Handle hole in radix tree at the end of the range. f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1465 * This code only triggers if there's nothing in radix tree f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1466 * beyond 'end'. f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1467 */ 3e9646c76cb91d Hugh Dickins 2018-11-30 1468 if (index < end) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1469 int n = end - index; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1470 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1471 /* Stop if extent has been truncated, and is now empty */ 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1472 if (n >= HPAGE_PMD_NR) { 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1473 result = SCAN_TRUNCATED; 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1474 goto tree_locked; 8797f2f4fe0d55 Hugh Dickins 2018-11-30 1475 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1476 if (!shmem_charge(mapping->host, n)) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1477 result = SCAN_FAIL; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1478 goto tree_locked; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1479 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1480 for (; index < end; index++) { b93b016313b3ba Matthew Wilcox 2018-04-10 1481 radix_tree_insert(&mapping->i_pages, index, f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1482 new_page + (index % HPAGE_PMD_NR)); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1483 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1484 nr_none += n; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1485 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1486 3e9646c76cb91d Hugh Dickins 2018-11-30 1487 __inc_node_page_state(new_page, NR_SHMEM_THPS); 3e9646c76cb91d Hugh Dickins 2018-11-30 1488 if (nr_none) { 3e9646c76cb91d Hugh Dickins 2018-11-30 1489 struct zone *zone = page_zone(new_page); 3e9646c76cb91d Hugh Dickins 2018-11-30 1490 3e9646c76cb91d Hugh Dickins 2018-11-30 1491 __mod_node_page_state(zone->zone_pgdat, NR_FILE_PAGES, nr_none); 3e9646c76cb91d Hugh Dickins 2018-11-30 1492 __mod_node_page_state(zone->zone_pgdat, NR_SHMEM, nr_none); 3e9646c76cb91d Hugh Dickins 2018-11-30 1493 } 3e9646c76cb91d Hugh Dickins 2018-11-30 1494 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1495 tree_locked: b93b016313b3ba Matthew Wilcox 2018-04-10 1496 xa_unlock_irq(&mapping->i_pages); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1497 tree_unlocked: f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1498 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1499 if (result == SCAN_SUCCEED) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1500 /* f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1501 * Replacing old pages with new one has succeed, now we need to f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1502 * copy the content and free old pages. f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1503 */ ee13d69bc1e8a5 Hugh Dickins 2018-11-30 1504 index = start; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1505 list_for_each_entry_safe(page, tmp, &pagelist, lru) { ee13d69bc1e8a5 Hugh Dickins 2018-11-30 1506 while (index < page->index) { ee13d69bc1e8a5 Hugh Dickins 2018-11-30 1507 clear_highpage(new_page + (index % HPAGE_PMD_NR)); ee13d69bc1e8a5 Hugh Dickins 2018-11-30 1508 index++; ee13d69bc1e8a5 Hugh Dickins 2018-11-30 1509 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1510 copy_highpage(new_page + (page->index % HPAGE_PMD_NR), f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1511 page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1512 list_del(&page->lru); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1513 page->mapping = NULL; 3e9646c76cb91d Hugh Dickins 2018-11-30 1514 page_ref_unfreeze(page, 1); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1515 ClearPageActive(page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1516 ClearPageUnevictable(page); 3e9646c76cb91d Hugh Dickins 2018-11-30 1517 unlock_page(page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1518 put_page(page); ee13d69bc1e8a5 Hugh Dickins 2018-11-30 1519 index++; ee13d69bc1e8a5 Hugh Dickins 2018-11-30 1520 } ee13d69bc1e8a5 Hugh Dickins 2018-11-30 1521 while (index < end) { ee13d69bc1e8a5 Hugh Dickins 2018-11-30 1522 clear_highpage(new_page + (index % HPAGE_PMD_NR)); ee13d69bc1e8a5 Hugh Dickins 2018-11-30 1523 index++; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1524 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1525 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1526 SetPageUptodate(new_page); af24c01831e4e2 Hugh Dickins 2018-11-30 1527 page_ref_add(new_page, HPAGE_PMD_NR - 1); 3e9646c76cb91d Hugh Dickins 2018-11-30 1528 set_page_dirty(new_page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1529 mem_cgroup_commit_charge(new_page, memcg, false, true); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1530 lru_cache_add_anon(new_page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1531 3e9646c76cb91d Hugh Dickins 2018-11-30 1532 /* 3e9646c76cb91d Hugh Dickins 2018-11-30 1533 * Remove pte page tables, so we can re-fault the page as huge. 3e9646c76cb91d Hugh Dickins 2018-11-30 1534 */ 3e9646c76cb91d Hugh Dickins 2018-11-30 1535 retract_page_tables(mapping, start); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1536 *hpage = NULL; 87aa752906ecf6 Yang Shi 2018-08-17 1537 87aa752906ecf6 Yang Shi 2018-08-17 1538 khugepaged_pages_collapsed++; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1539 } else { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1540 /* Something went wrong: rollback changes to the radix-tree */ b93b016313b3ba Matthew Wilcox 2018-04-10 1541 xa_lock_irq(&mapping->i_pages); 78141aabfbb956 Hugh Dickins 2018-11-30 1542 mapping->nrpages -= nr_none; 78141aabfbb956 Hugh Dickins 2018-11-30 1543 shmem_uncharge(mapping->host, nr_none); 78141aabfbb956 Hugh Dickins 2018-11-30 1544 b93b016313b3ba Matthew Wilcox 2018-04-10 1545 radix_tree_for_each_slot(slot, &mapping->i_pages, &iter, start) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1546 if (iter.index >= end) f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1547 break; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1548 page = list_first_entry_or_null(&pagelist, f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1549 struct page, lru); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1550 if (!page || iter.index < page->index) { f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1551 if (!nr_none) f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1552 break; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1553 nr_none--; 59749e6ce53735 Johannes Weiner 2016-12-12 1554 /* Put holes back where they were */ b93b016313b3ba Matthew Wilcox 2018-04-10 1555 radix_tree_delete(&mapping->i_pages, iter.index); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1556 continue; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1557 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1558 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1559 VM_BUG_ON_PAGE(page->index != iter.index, page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1560 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1561 /* Unfreeze the page. */ f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1562 list_del(&page->lru); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1563 page_ref_unfreeze(page, 2); b93b016313b3ba Matthew Wilcox 2018-04-10 1564 radix_tree_replace_slot(&mapping->i_pages, slot, page); 148deab223b237 Matthew Wilcox 2016-12-14 1565 slot = radix_tree_iter_resume(slot, &iter); b93b016313b3ba Matthew Wilcox 2018-04-10 1566 xa_unlock_irq(&mapping->i_pages); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1567 unlock_page(page); 3e9646c76cb91d Hugh Dickins 2018-11-30 1568 putback_lru_page(page); b93b016313b3ba Matthew Wilcox 2018-04-10 1569 xa_lock_irq(&mapping->i_pages); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1570 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1571 VM_BUG_ON(nr_none); b93b016313b3ba Matthew Wilcox 2018-04-10 1572 xa_unlock_irq(&mapping->i_pages); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1573 f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1574 mem_cgroup_cancel_charge(new_page, memcg, true); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1575 new_page->mapping = NULL; f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1576 } 3e9646c76cb91d Hugh Dickins 2018-11-30 1577 3e9646c76cb91d Hugh Dickins 2018-11-30 1578 unlock_page(new_page); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1579 out: f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1580 VM_BUG_ON(!list_empty(&pagelist)); f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1581 /* TODO: tracepoints */ f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1582 } f3f0e1d2150b2b Kirill A. Shutemov 2016-07-26 1583 :::::: The code at line 1307 was first introduced by commit :::::: f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 khugepaged: add support of collapse for tmpfs/shmem pages :::::: TO: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> :::::: CC: Linus Torvalds <torvalds@linux-foundation.org> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki