mm/hugetlb: move huge_boot_pages list init to hugetlb_bootmem_alloc

Instead of initializing the per-node hugetlb bootmem pages list from the
alloc function, we can now do it in a somewhat cleaner way, since there is
an explicit hugetlb_bootmem_alloc function. Initialize the lists there.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Frank van der Linden <[e-mail]>
Cc: Alexander Gordeev <[e-mail]>
Cc: Andy Lutomirski <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Dan Carpenter <[e-mail]>
Cc: Dave Hansen <[e-mail]>
Cc: David Hildenbrand <[e-mail]>
Cc: Heiko Carstens <[e-mail]>
Cc: Joao Martins <[e-mail]>
Cc: Johannes Weiner <[e-mail]>
Cc: Madhavan Srinivasan <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Muchun Song <[e-mail]>
Cc: Oscar Salvador <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Roman Gushchin (Cruise) <[e-mail]>
Cc: Usama Arif <[e-mail]>
Cc: Vasily Gorbik <[e-mail]>
Cc: Yu Zhao <[e-mail]>
Cc: Zi Yan <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

mm/hugetlb.c

···
 static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
 {
 	unsigned long allocated;
-	static bool initialized __initdata;
 
 	/* skip gigantic hugepages allocation if hugetlb_cma enabled */
 	if (hstate_is_gigantic(h) && hugetlb_cma_size) {
 		pr_warn_once("HugeTLB: hugetlb_cma is enabled, skip boot time allocation\n");
 		return;
-	}
-
-	/* hugetlb_hstate_alloc_pages will be called many times, initialize huge_boot_pages once */
-	if (!initialized) {
-		int i = 0;
-
-		for (i = 0; i < MAX_NUMNODES; i++)
-			INIT_LIST_HEAD(&huge_boot_pages[i]);
-		h->next_nid_to_alloc = first_online_node;
-		h->next_nid_to_free = first_online_node;
-		initialized = true;
 	}
 
 	/* do node specific alloc */
···
 void __init hugetlb_bootmem_alloc(void)
 {
 	struct hstate *h;
+	int i;
 
 	if (__hugetlb_bootmem_allocated)
 		return;
 
+	for (i = 0; i < MAX_NUMNODES; i++)
+		INIT_LIST_HEAD(&huge_boot_pages[i]);
+
 	hugetlb_parse_params();
 
 	for_each_hstate(h) {
+		h->next_nid_to_alloc = first_online_node;
+		h->next_nid_to_free = first_online_node;
+
 		if (hstate_is_gigantic(h))
 			hugetlb_hstate_alloc_pages(h);
 	}