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

Commit 61167ad5fecd ("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: 61167ad5fecd ("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>

diff --git a/mm/memblock.c b/mm/memblock.c
index 9639f04b4fdf9f88154a7a824c12fe97dc3038e1..d3509414b8c3a1b055d913482e1fd49b36554312 100644 (file)
--- a/mm/memblock.c
+++ b/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