[RFC patch] vm: clear swap entry before copying pte

[Hillf Danton]

If swap entry is cleared, we can see the reason that copying pte is
interrupted. If due to page table lock held long enough, no need to
increase swap count.

Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---

--- a/mm/memory.c	Fri Jul 27 21:33:32 2012
+++ b/mm/memory.c	Fri Jul 27 21:35:24 2012
@@ -971,6 +971,7 @@ again:
 		if (add_swap_count_continuation(entry, GFP_KERNEL) < 0)
 			return -ENOMEM;
 		progress = 0;
+		entry.val = 0;
 	}
 	if (addr != end)
 		goto again;
--
--
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