diff options
| -rw-r--r-- | mm/huge_memory.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 1cc4a5f4791e..03fc7e5edf07 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2455,7 +2455,16 @@ static void __split_huge_page_tail(struct page *head, int tail, page_tail); page_tail->mapping = head->mapping; page_tail->index = head->index + tail; - page_tail->private = 0; + + /* + * page->private should not be set in tail pages with the exception + * of swap cache pages that store the swp_entry_t in tail pages. + * Fix up and warn once if private is unexpectedly set. + */ + if (!folio_test_swapcache(page_folio(head))) { + VM_WARN_ON_ONCE_PAGE(page_tail->private != 0, head); + page_tail->private = 0; + } /* Page flags must be visible before we make the page non-compound. */ smp_wmb(); |