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-rw-r--r--include/linux/mm.h1
-rw-r--r--mm/memory-failure.c22
2 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9d65ae4..68c84bb 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 50d4f8d..38fcbb2 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.
*
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