mm: page_alloc: make compound_page_dtors static

It's only used inside page_alloc.c now. So make it static and remove the
declaration in mm.h.

Link: https://lkml.kernel.org/r/20230617034622.1235913-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index a8baa34..cf43deb 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1220,7 +1220,6 @@ enum compound_dtor_id {
 #endif
        NR_COMPOUND_DTORS,
 };
-extern compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS];
 
 static inline void folio_set_compound_dtor(struct folio *folio,
                enum compound_dtor_id compound_dtor)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6a18f22..5b8a9d6 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -284,7 +284,7 @@ const char * const migratetype_names[MIGRATE_TYPES] = {
 #endif
 };
 
-compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS] = {
+static compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS] = {
        [NULL_COMPOUND_DTOR] = NULL,
        [COMPOUND_PAGE_DTOR] = free_compound_page,
 #ifdef CONFIG_HUGETLB_PAGE