diff --git a/mm/shmem.c b/mm/shmem.c index 91e2620148b2f6d789420e6736daef7a53e2cc5c..0d1ce70bce38028970802375b2409e9e6400364f 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1080,7 +1080,24 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend, } VM_BUG_ON_FOLIO(folio_test_writeback(folio), folio); - truncate_inode_folio(mapping, folio); + + if (!folio_test_large(folio)) { + truncate_inode_folio(mapping, folio); + } else if (truncate_inode_partial_folio(folio, lstart, lend)) { + /* + * If we split a page, reset the loop so + * that we pick up the new sub pages. + * Otherwise the THP was entirely + * dropped or the target range was + * zeroed, so just continue the loop as + * is. + */ + if (!folio_test_large(folio)) { + folio_unlock(folio); + index = start; + break; + } + } } folio_unlock(folio); }