diff options
| -rw-r--r-- | mm/internal.h | 3 | ||||
| -rw-r--r-- | mm/memory-failure.c | 9 | ||||
| -rw-r--r-- | mm/page_alloc.c | 21 |
3 files changed, 31 insertions, 2 deletions
diff --git a/mm/internal.h b/mm/internal.h index 4fe67a162cb..49b2ff776b7 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -50,6 +50,9 @@ extern void putback_lru_page(struct page *page); */ extern void __free_pages_bootmem(struct page *page, unsigned int order); extern void prep_compound_page(struct page *page, unsigned long order); +#ifdef CONFIG_MEMORY_FAILURE +extern bool is_free_buddy_page(struct page *page); +#endif /* diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 676ab394200..5055b940df5 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -807,8 +807,13 @@ int __memory_failure(unsigned long pfn, int trapno, int flags) */ if (!(flags & MF_COUNT_INCREASED) && !get_page_unless_zero(compound_head(p))) { - action_result(pfn, "free or high order kernel", IGNORED); - return PageBuddy(compound_head(p)) ? 0 : -EBUSY; + if (is_free_buddy_page(p)) { + action_result(pfn, "free buddy", DELAYED); + return 0; + } else { + action_result(pfn, "high order kernel", IGNORED); + return -EBUSY; + } } /* diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 59d2e88fb47..6867b4d391f 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5081,3 +5081,24 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) spin_unlock_irqrestore(&zone->lock, flags); } #endif + +#ifdef CONFIG_MEMORY_FAILURE +bool is_free_buddy_page(struct page *page) +{ + struct zone *zone = page_zone(page); + unsigned long pfn = page_to_pfn(page); + unsigned long flags; + int order; + + 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) + break; + } + spin_unlock_irqrestore(&zone->lock, flags); + + return order < MAX_ORDER; +} +#endif |