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-rw-r--r--mm/memory-failure.c22
1 files changed, 18 insertions, 4 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index ceb0c7f1932f..2c13aa7a0164 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1410,7 +1410,8 @@ static int __get_any_page(struct page *p, unsigned long pfn, int flags)
/*
* Isolate the page, so that it doesn't get reallocated if it
- * was free.
+ * was free. This flag should be kept set until the source page
+ * is freed and PG_hwpoison on it is set.
*/
set_migratetype_isolate(p, true);
/*
@@ -1433,7 +1434,6 @@ static int __get_any_page(struct page *p, unsigned long pfn, int flags)
/* Not a free page */
ret = 1;
}
- unset_migratetype_isolate(p, MIGRATE_MOVABLE);
unlock_memory_hotplug();
return ret;
}
@@ -1494,7 +1494,6 @@ static int soft_offline_huge_page(struct page *page, int flags)
atomic_long_add(1 << compound_trans_order(hpage),
&num_poisoned_pages);
}
- /* keep elevated page count for bad page */
return ret;
}
@@ -1559,7 +1558,7 @@ int soft_offline_page(struct page *page, int flags)
atomic_long_inc(&num_poisoned_pages);
}
}
- /* keep elevated page count for bad page */
+ unset_migratetype_isolate(page, MIGRATE_MOVABLE);
return ret;
}
@@ -1625,7 +1624,22 @@ static int __soft_offline_page(struct page *page, int flags)
if (ret > 0)
ret = -EIO;
} else {
+ /*
+ * After page migration succeeds, the source page can
+ * be trapped in pagevec and actual freeing is delayed.
+ * Freeing code works differently based on PG_hwpoison,
+ * so there's a race. We need to make sure that the
+ * source page should be freed back to buddy before
+ * setting PG_hwpoison.
+ */
+ if (!is_free_buddy_page(page))
+ lru_add_drain_all();
+ if (!is_free_buddy_page(page))
+ drain_all_pages();
SetPageHWPoison(page);
+ if (!is_free_buddy_page(page))
+ pr_info("soft offline: %#lx: page leaked\n",
+ pfn);
atomic_long_inc(&num_poisoned_pages);
}
} else {