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Subject[Patch] mm/sparse.c: Check the return value of sparse_index_alloc().

Since sparse_index_alloc() can return NULL on memory allocation failure,
we must deal with the failure condition when calling it.

Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Rik van Riel <riel@redhat.com>

---
diff --git a/Makefile b/Makefile
diff --git a/mm/sparse.c b/mm/sparse.c
index e06f514..d245e59 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -83,6 +83,8 @@ static int __meminit sparse_index_init(unsigned long section_nr, int nid)
return -EEXIST;

section = sparse_index_alloc(nid);
+ if (!section)
+ return -ENOMEM;
/*
* This lock keeps two different sections from
* reallocating for the same index
-
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