mm/page_alloc: rename page_alloc_init() to page_alloc_init_cpuhp()

The page_alloc_init() name is really misleading because all this function
does is sets up CPU hotplug callbacks for the page allocator.

Rename it to page_alloc_init_cpuhp() so that name will reflect what the
function does.

Link: https://lkml.kernel.org/r/20230321170513.2401534-6-rppt@kernel.orgSigned-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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/gfp.h

@@ -319,7 +319,7 @@ extern void page_frag_free(void *addr);
 #define __free_page(page) __free_pages((page), 0)
 #define free_page(addr) free_pages((addr), 0)
 
-void page_alloc_init(void);
+void page_alloc_init_cpuhp(void);
 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
 void drain_all_pages(struct zone *zone);
 void drain_local_pages(struct zone *zone);

init/main.c

@@ -973,7 +973,7 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
 	boot_cpu_hotplug_init();
 
 	build_all_zonelists(NULL);
-	page_alloc_init();
+	page_alloc_init_cpuhp();
 
 	pr_notice("Kernel command line: %s\n", saved_command_line);
 	/* parameters may set static keys */

mm/page_alloc.c

@@ -6393,7 +6393,7 @@ static int page_alloc_cpu_online(unsigned int cpu)
 	return 0;
 }
 
-void __init page_alloc_init(void)
+void __init page_alloc_init_cpuhp(void)
 {
 	int ret;