linux-kernel - [PATCH v2 1/2] mm/memory_hotplug: remove reset_node_managed_pages() in hotadd_init

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Date:   Wed,  7 Jun 2023 02:45:48 +0000
From:   Haifeng Xu <haifeng.xu@...pee.com>
To:     david@...hat.com
Cc:     rppt@...nel.org, mhocko@...nel.org, osalvador@...e.de,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Haifeng Xu <haifeng.xu@...pee.com>
Subject: [PATCH v2 1/2] mm/memory_hotplug: remove reset_node_managed_pages() in hotadd_init_pgdat()

managed pages has already been set to 0 in free_area_init_core_hotplug(),
via zone_init_internals() on each zone. It's pointless to reset again.

Furthermore, reset_node_managed_pages() no longer needs to be exposed
outside of mm/memblock.c. Remove declaration in include/linux/memblock.h
and define it as static.

In addtion to this, the only caller of reset_node_managed_pages() is
reset_all_zones_managed_pages(), which is annotated with __init, so it
should be safe to also mark reset_node_managed_pages() as __init.

Signed-off-by: Haifeng Xu <haifeng.xu@...pee.com>
Suggested-by: David Hildenbrand <david@...hat.com>
---
v2:
- unexport reset_node_managed_pages()
- mark reset_node_managed_pages() as __init
- update commit message
---
 include/linux/memblock.h | 1 -
 mm/memblock.c            | 2 +-
 mm/memory_hotplug.c      | 1 -
 3 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index f82ee3fac1cd..f71ff9f0ec81 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -128,7 +128,6 @@ int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
 
 void memblock_free_all(void);
 void memblock_free(void *ptr, size_t size);
-void reset_node_managed_pages(pg_data_t *pgdat);
 void reset_all_zones_managed_pages(void);
 
 /* Low level functions */
diff --git a/mm/memblock.c b/mm/memblock.c
index 3feafea06ab2..da4264528e1e 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -2122,7 +2122,7 @@ static unsigned long __init free_low_memory_core_early(void)
 
 static int reset_managed_pages_done __initdata;
 
-void reset_node_managed_pages(pg_data_t *pgdat)
+static void __init reset_node_managed_pages(pg_data_t *pgdat)
 {
 	struct zone *z;
 
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 8e0fa209d533..65e385f34679 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1210,7 +1210,6 @@ static pg_data_t __ref *hotadd_init_pgdat(int nid)
 	 * online_pages() and offline_pages().
 	 * TODO: should be in free_area_init_core_hotplug?
 	 */
-	reset_node_managed_pages(pgdat);
 	reset_node_present_pages(pgdat);
 
 	return pgdat;
-- 
2.25.1