[PATCH] pte_alloc_kernel needs additional check

[Paul Larson]

This applies against 2.5.63.
pte_alloc_kernel needs a check for pmd_present(*pmd) at the end.

Thanks,
Paul Larson

--- linux-2.5.63/mm/memory.c	Mon Feb 24 13:05:31 2003
+++ linux-2.5.63-fix/mm/memory.c	Mon Feb 24 15:45:05 2003
@@ -186,7 +186,9 @@
 		pmd_populate_kernel(mm, pmd, new);
 	}
 out:
-	return pte_offset_kernel(pmd, address);
+	if (pmd_present(*pmd))
+		return pte_offset_kernel(pmd, address);
+	return NULL;
 }
 #define PTE_TABLE_MASK	((PTRS_PER_PTE-1) * sizeof(pte_t))
 #define PMD_TABLE_MASK	((PTRS_PER_PMD-1) * sizeof(pmd_t))