mm: call {ptlock,pgtable}_cache_init() directly from mm_core_init()

and drop pgtable_init() as it has no real value and its name is
misleading.

Link: https://lkml.kernel.org/r/20230321170513.2401534-9-rppt@kernel.org
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Doug Berger <opendmb@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Sergei Shtylyov <sergei.shtylyov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/mm.h

@@ -2637,12 +2637,6 @@ static inline bool ptlock_init(struct page *page) { return true; }
 static inline void ptlock_free(struct page *page) {}
 #endif /* USE_SPLIT_PTE_PTLOCKS */
 
-static inline void pgtable_init(void)
-{
-	ptlock_cache_init();
-	pgtable_cache_init();
-}
-
 static inline bool pgtable_pte_page_ctor(struct page *page)
 {
 	if (!ptlock_init(page))

mm/mm_init.c

@@ -2584,7 +2584,8 @@ void __init mm_core_init(void)
 	 */
 	page_ext_init_flatmem_late();
 	kmemleak_init();
-	pgtable_init();
+	ptlock_cache_init();
+	pgtable_cache_init();
 	debug_objects_mem_init();
 	vmalloc_init();
 	/* If no deferred init page_ext now, as vmap is fully initialized */