Merge tag 'fixes-2024-06-13' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock

Pull memblock fixes from Mike Rapoport:
 "Fix validation of NUMA coverage.

  memblock_validate_numa_coverage() was checking for a unset node ID
  using NUMA_NO_NODE, but x86 used MAX_NUMNODES when no node ID was
  specified by buggy firmware.

  Update memblock to substitute MAX_NUMNODES with NUMA_NO_NODE in
  memblock_set_node() and use NUMA_NO_NODE in x86::numa_init()"

* tag 'fixes-2024-06-13' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
  x86/mm/numa: Use NUMA_NO_NODE when calling memblock_set_node()
  memblock: make memblock_set_node() also warn about use of MAX_NUMNODES

Author: torvalds

arch/x86/mm/numa.c

@@ -493,7 +493,7 @@ static void __init numa_clear_kernel_node_hotplug(void)
 	for_each_reserved_mem_region(mb_region) {
 		int nid = memblock_get_region_node(mb_region);
 
-		if (nid != MAX_NUMNODES)
+		if (nid != NUMA_NO_NODE)
 			node_set(nid, reserved_nodemask);
 	}
 
@@ -614,9 +614,9 @@ static int __init numa_init(int (*init_func)(void))
 	nodes_clear(node_online_map);
 	memset(&numa_meminfo, 0, sizeof(numa_meminfo));
 	WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.memory,
-				  MAX_NUMNODES));
+				  NUMA_NO_NODE));
 	WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.reserved,
-				  MAX_NUMNODES));
+				  NUMA_NO_NODE));
 	/* In case that parsing SRAT failed. */
 	WARN_ON(memblock_clear_hotplug(0, ULLONG_MAX));
 	numa_reset_distance();

mm/memblock.c

@@ -1339,6 +1339,10 @@ int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
 	int start_rgn, end_rgn;
 	int i, ret;
 
+	if (WARN_ONCE(nid == MAX_NUMNODES,
+		      "Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
+		nid = NUMA_NO_NODE;
+
 	ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
 	if (ret)
 		return ret;