init: fold build_all_zonelists() and page_alloc_init_cpuhp() to mm_init()

Both build_all_zonelists() and page_alloc_init_cpuhp() must be called
after SMP setup is complete but before the page allocator is set up.

Still, they both are a part of memory management initialization, so move
them to mm_init().

Link: https://lkml.kernel.org/r/20230321170513.2401534-7-rppt@kernel.orgSigned-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Acked-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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

init/main.c

@@ -837,6 +837,10 @@ static void __init report_meminit(void)
  */
 static void __init mm_init(void)
 {
+	/* Initializations relying on SMP setup */
+	build_all_zonelists(NULL);
+	page_alloc_init_cpuhp();
+
 	/*
 	 * page_ext requires contiguous pages,
 	 * bigger than MAX_ORDER unless SPARSEMEM.
@@ -972,9 +976,6 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
 	smp_prepare_boot_cpu();	/* arch-specific boot-cpu hooks */
 	boot_cpu_hotplug_init();
 
-	build_all_zonelists(NULL);
-	page_alloc_init_cpuhp();
-
 	pr_notice("Kernel command line: %s\n", saved_command_line);
 	/* parameters may set static keys */
 	jump_label_init();