# \[PATCH v2 09/69\] mm/mm\_init: Defer hugetlb reservation until after zone initialization

- From: Muchun Song \<hidden\>
- Date: 2026-05-13 13:08:23 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2026/05/9003584
- Thread: https://ratatoskr.run/linux-mm/2026/05/9003574/t.md

```text
hugetlb_cma_reserve() and hugetlb_bootmem_alloc() currently run before
free_area_init(), so HugeTLB reservation happens before zone state is
initialized.

Move the reservation step after free_area_init() so the relevant zone
information is available before HugeTLB reserves memory. This is needed
for later hugetlb changes that validate boot-time HugeTLB reservations
against zone boundaries.

Signed-off-by: Muchun Song <redacted>
---
 mm/mm_init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/mm_init.c b/mm/mm_init.c
index c14491c2dad3..75f98abfed97 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -2688,11 +2688,11 @@ void __init mm_core_init_early(void)
 {
 	int nid;
 
+	free_area_init();
+
 	hugetlb_cma_reserve();
 	hugetlb_bootmem_alloc();
 
-	free_area_init();
-
 	sparse_init();
 	for_each_node_state(nid, N_MEMORY)
 		sparse_vmemmap_init_nid_late(nid);
-- 
2.54.0


```