diff options
| -rw-r--r-- | include/linux/mm.h | 1 | ||||
| -rw-r--r-- | mm/memory-failure.c | 22 |
2 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 9d65ae4ba0e..68c84bb2ad3 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1335,6 +1335,7 @@ extern void memory_failure(unsigned long pfn, int trapno); extern int __memory_failure(unsigned long pfn, int trapno, int ref); extern int sysctl_memory_failure_early_kill; extern int sysctl_memory_failure_recovery; +extern void shake_page(struct page *p); extern atomic_long_t mce_bad_pages; #endif /* __KERNEL__ */ diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 50d4f8d7024..38fcbb22eab 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -83,6 +83,28 @@ static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno, } /* + * When a unknown page type is encountered drain as many buffers as possible + * in the hope to turn the page into a LRU or free page, which we can handle. + */ +void shake_page(struct page *p) +{ + if (!PageSlab(p)) { + lru_add_drain_all(); + if (PageLRU(p)) + return; + drain_all_pages(); + if (PageLRU(p) || is_free_buddy_page(p)) + return; + } + /* + * Could call shrink_slab here (which would also + * shrink other caches). Unfortunately that might + * also access the corrupted page, which could be fatal. + */ +} +EXPORT_SYMBOL_GPL(shake_page); + +/* * Kill all processes that have a poisoned page mapped and then isolate * the page. * |