diff options
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c677c1506d73..e75865d58ba7 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -8096,3 +8096,33 @@ bool is_free_buddy_page(struct page *page) return order < MAX_ORDER; } + +#ifdef CONFIG_MEMORY_FAILURE +/* + * Set PG_hwpoison flag if a given page is confirmed to be a free page. This + * test is performed under the zone lock to prevent a race against page + * allocation. + */ +bool set_hwpoison_free_buddy_page(struct page *page) +{ + struct zone *zone = page_zone(page); + unsigned long pfn = page_to_pfn(page); + unsigned long flags; + unsigned int order; + bool hwpoisoned = false; + + spin_lock_irqsave(&zone->lock, flags); + for (order = 0; order < MAX_ORDER; order++) { + struct page *page_head = page - (pfn & ((1 << order) - 1)); + + if (PageBuddy(page_head) && page_order(page_head) >= order) { + if (!TestSetPageHWPoison(page)) + hwpoisoned = true; + break; + } + } + spin_unlock_irqrestore(&zone->lock, flags); + + return hwpoisoned; +} +#endif |