diff options
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 506eac8b38af..73aa335c1397 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -446,6 +446,7 @@ void prep_compound_page(struct page *page, unsigned long order) for (i = 1; i < nr_pages; i++) { struct page *p = page + i; set_page_count(p, 0); + p->mapping = TAIL_MAPPING; p->first_page = page; /* Make sure p->first_page is always valid for PageTail() */ smp_wmb(); @@ -824,6 +825,12 @@ static void free_one_page(struct zone *zone, static int free_tail_pages_check(struct page *head_page, struct page *page) { + if (page->mapping != TAIL_MAPPING) { + bad_page(page, "corrupted mapping in tail page", 0); + page->mapping = NULL; + return 1; + } + page->mapping = NULL; if (!IS_ENABLED(CONFIG_DEBUG_VM)) return 0; if (unlikely(!PageTail(page))) { |