Subject: [PATCH v2 07/25] mm: drop CONFIG_HAVE_ARCH_NODEDATA_EXTENSION

From: Mike Rapoport <[email-masked]>
Date: Tue, 23 Jul 2024 09:41:38 +0300

From: "Mike Rapoport (Microsoft)" <[email-masked]>

There are no users of HAVE_ARCH_NODEDATA_EXTENSION left, so
arch_alloc_nodedata() and arch_refresh_nodedata() are not needed
anymore.

Replace the call to arch_alloc_nodedata() in free_area_init() with
memblock_alloc(), remove arch_refresh_nodedata() and cleanup
include/linux/memory_hotplug.h from the associated ifdefery.

Signed-off-by: Mike Rapoport (Microsoft) <[email-masked]>
---
 include/linux/memory_hotplug.h | 48 ----------------------------------
 mm/mm_init.c                   |  3 +--
 2 files changed, 1 insertion(+), 50 deletions(-)

diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 7a9ff464608d..978c0dfb64a1 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -16,54 +16,6 @@ struct resource;
 struct vmem_altmap;
 struct dev_pagemap;
 
-#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
-/*
- * For supporting node-hotadd, we have to allocate a new pgdat.
- *
- * If an arch has generic style NODE_DATA(),
- * node_data[nid] = kzalloc() works well. But it depends on the architecture.
- *
- * In general, generic_alloc_nodedata() is used.
- *
- */
-extern pg_data_t *arch_alloc_nodedata(int nid);
-extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
-
-#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
-
-#define arch_alloc_nodedata(nid)	generic_alloc_nodedata(nid)
-
-#ifdef CONFIG_NUMA
-/*
- * XXX: node aware allocation can't work well to get new node's memory at this time.
- *	Because, pgdat for the new node is not allocated/initialized yet itself.
- *	To use new node's memory, more consideration will be necessary.
- */
-#define generic_alloc_nodedata(nid)				\
-({								\
-	memblock_alloc(sizeof(*pgdat), SMP_CACHE_BYTES);	\
-})
-
-extern pg_data_t *node_data[];
-static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
-{
-	node_data[nid] = pgdat;
-}
-
-#else /* !CONFIG_NUMA */
-
-/* never called */
-static inline pg_data_t *generic_alloc_nodedata(int nid)
-{
-	BUG();
-	return NULL;
-}
-static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
-{
-}
-#endif /* CONFIG_NUMA */
-#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
-
 #ifdef CONFIG_MEMORY_HOTPLUG
 struct page *pfn_to_online_page(unsigned long pfn);
 
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 3ec04933f7fd..e1b3ea0523bd 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -1831,11 +1831,10 @@ void __init free_area_init(unsigned long *max_zone_pfn)
 
 		if (!node_online(nid)) {
 			/* Allocator not initialized yet */
-			pgdat = arch_alloc_nodedata(nid);
+			pgdat = memblock_alloc(sizeof(*pgdat), SMP_CACHE_BYTES);
 			if (!pgdat)
 				panic("Cannot allocate %zuB for node %d.\n",
 				       sizeof(*pgdat), nid);
-			arch_refresh_nodedata(nid, pgdat);
 		}
 
 		pgdat = NODE_DATA(nid);
-- 
2.43.0