mm/memblock: repeat setting reserved region nid if array is doubled

Commit 61167ad ("mm: pass nid to reserve_bootmem_region()") introduce
a way to set nid to all reserved region.

But there is a corner case it will leave some region with invalid nid.
When memblock_set_node() doubles the array of memblock.reserved, it may
lead to a new reserved region before current position. The new region
will be left with an invalid node id.

Repeat the process when detecting it.

Fixes: 61167ad ("mm: pass nid to reserve_bootmem_region()")
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
CC: Mike Rapoport <rppt@kernel.org>
CC: Yajun Deng <yajun.deng@linux.dev>
CC: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250318071948.23854-3-richard.weiyang@gmail.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

Author: RichardWeiYang

mm/memblock.c

@@ -2183,11 +2183,14 @@ static void __init memmap_init_reserved_pages(void)
 	struct memblock_region *region;
 	phys_addr_t start, end;
 	int nid;
+	unsigned long max_reserved;
 
 	/*
 	 * set nid on all reserved pages and also treat struct
 	 * pages for the NOMAP regions as PageReserved
 	 */
+repeat:
+	max_reserved = memblock.reserved.max;
 	for_each_mem_region(region) {
 		nid = memblock_get_region_node(region);
 		start = region->base;
@@ -2198,6 +2201,13 @@ static void __init memmap_init_reserved_pages(void)
 
 		memblock_set_node(start, region->size, &memblock.reserved, nid);
 	}
+	/*
+	 * 'max' is changed means memblock.reserved has been doubled its
+	 * array, which may result a new reserved region before current
+	 * 'start'. Now we should repeat the procedure to set its node id.
+	 */
+	if (max_reserved != memblock.reserved.max)
+		goto repeat;
 
 	/*
 	 * initialize struct pages for reserved regions that don't have