memblock tests: add top-down NUMA tests for memblock_alloc_exact_nid_raw

Add tests for memblock_alloc_exact_nid_raw() where the simulated physical
memory is set up with multiple NUMA nodes. Additionally, all of these
tests set nid != NUMA_NO_NODE. These tests are run with a top-down
allocation direction.

The tested scenarios are:

Range unrestricted:
- region can be allocated in the specific node requested:
      + there are no previously reserved regions
      + the requested node is partially reserved but has enough space

Range restricted:
- region can be allocated in the specific node requested after dropping
  min_addr:
      + range partially overlaps with two different nodes, where the
        first node is the requested node
      + range partially overlaps with two different nodes, where the
        requested node ends before min_addr
      + range overlaps with multiple nodes along node boundaries, and
        the requested node ends before min_addr
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Rebecca Mckeever <remckee0@gmail.com>
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Link: https://lore.kernel.org/r/2cc0883243d68ddc3faf833d2d9e86f48534c1d7.1667802195.git.remckee0@gmail.com

tools/testing/memblock/tests/alloc_exact_nid_api.h

@@ -5,5 +5,21 @@
 #include "common.h"
 
 int memblock_alloc_exact_nid_checks(void);
+int __memblock_alloc_exact_nid_numa_checks(void);
+
+#ifdef CONFIG_NUMA
+static inline int memblock_alloc_exact_nid_numa_checks(void)
+{
+	__memblock_alloc_exact_nid_numa_checks();
+	return 0;
+}
+
+#else
+static inline int memblock_alloc_exact_nid_numa_checks(void)
+{
+	return 0;
+}
+
+#endif /* CONFIG_NUMA */
 
 #endif