[RFC]get_swap_page():delay update swap_list.next

[Bo Liu <bo-liu@hotmail.com>]

If scan_swap_map() successed in current si, there is no
need to update swap_list.next.So get_swap_page next time 
called can start search from the last swap_info(which still
have free slots).
 
 
Signed-off-by: Bo Liu <bo-liu@hotmail.com>
---
 
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 63ce10f..b3ba2c5 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -480,13 +480,13 @@ swp_entry_t get_swap_page(void)
   if (!(si->flags & SWP_WRITEOK))
    continue;
 
-  swap_list.next = next;
   /* This is called for allocating swap entry for cache */
   offset = scan_swap_map(si, SWAP_CACHE);
   if (offset) {
    spin_unlock(&swap_lock);
    return swp_entry(type, offset);
   }
+  swap_list.next = next;
   next = swap_list.next;
  }
  		 	   		  
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