diff --git a/include/linux/mm.h b/include/linux/mm.h index 9d65ae4ba0e0b613717c5d9a1c7a3f15f09b0105..68c84bb2ad3f782da12ac43b3cd282dca87514a6 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 50d4f8d7024a04280c14eb2a47e2ad5151230987..38fcbb22eab97ada6d1db10f8bead4e5b9bc4043 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -82,6 +82,28 @@ static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno, return ret; } +/* + * 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.