From: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx> Infinite loop within __get_longterm_locked detected in an unique usage of pin_user_pages where the VA's pages are all unpinnable(vm_ops->fault function allocate pages via cma_alloc for hardware purpose and leave them out of LRU). Fixing this by have 'collected' reflect the actual number of pages in movable_folio_list. Signed-off-by: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx> --- mm/gup.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/gup.c b/mm/gup.c index 3b75e631f369..2231ce7221f9 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2341,8 +2341,6 @@ static unsigned long collect_longterm_unpinnable_folios( if (folio_is_longterm_pinnable(folio)) continue; - collected++; - if (folio_is_device_coherent(folio)) continue; @@ -2359,6 +2357,8 @@ static unsigned long collect_longterm_unpinnable_folios( if (!folio_isolate_lru(folio)) continue; + collected++; + list_add_tail(&folio->lru, movable_folio_list); node_stat_mod_folio(folio, NR_ISOLATED_ANON + folio_is_file_lru(folio), -- 2.25.1
