[v3,1/2] mm: numa_memblks: introduce numa_add_reserved_memblk

Commit Message

Yuquan Wang March 17, 2025, 10:15 a.m. UTC

With numa_add_reserved_memblk(), kernel could add numa_memblk into
numa_reserved_meminfo directly.

In previous, such process relies on numa_add_memblk() adding to
numa_meminfo list first and then uses numa_move_tail_memblk() to
move one from numa_meminfo to numa_reserved_meminfo.

Signed-off-by: Yuquan Wang <[e-mail]>
---
 include/linux/numa_memblks.h |  1 +
 mm/numa_memblks.c            | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

Patch

diff --git a/include/linux/numa_memblks.h b/include/linux/numa_memblks.h
index dd85613cdd86..991076cba7c5 100644
--- a/include/linux/numa_memblks.h
+++ b/include/linux/numa_memblks.h
@@ -22,6 +22,7 @@  struct numa_meminfo {
 };
 
 int __init numa_add_memblk(int nodeid, u64 start, u64 end);
+int __init numa_add_reserved_memblk(int nid, u64 start, u64 end);
 void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi);
 
 int __init numa_cleanup_meminfo(struct numa_meminfo *mi);
diff --git a/mm/numa_memblks.c b/mm/numa_memblks.c
index ff4054f4334d..e70c76cc46dd 100644
--- a/mm/numa_memblks.c
+++ b/mm/numa_memblks.c
@@ -200,6 +200,22 @@  int __init numa_add_memblk(int nid, u64 start, u64 end)
 	return numa_add_memblk_to(nid, start, end, &numa_meminfo);
 }
 
+/**
+ * numa_add_reserved_memblk - Add one numa_memblk to numa_reserved_meminfo
+ * @nid: NUMA node ID of the new memblk
+ * @start: Start address of the new memblk
+ * @end: End address of the new memblk
+ *
+ * Add a new memblk to the numa_reserved_meminfo.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+int __init numa_add_reserved_memblk(int nid, u64 start, u64 end)
+{
+	return numa_add_memblk_to(nid, start, end, &numa_reserved_meminfo);
+}
+
 /**
  * numa_cleanup_meminfo - Cleanup a numa_meminfo
  * @mi: numa_meminfo to clean up