mm/hugetlb_cgroup: convert set_hugetlb_cgroup*() to folios

Allows __prep_new_huge_page() to operate on a folio by converting
set_hugetlb_cgroup*() to take in a folio.

Link: https://lkml.kernel.org/r/20221101223059.460937-4-sidhartha.kumar@oracle.comSigned-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Bui Quang Minh <minhquangbui99@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/hugetlb_cgroup.h

@@ -112,16 +112,16 @@ static inline void __set_hugetlb_cgroup(struct folio *folio,
 				 (unsigned long)h_cg);
 }
 
-static inline void set_hugetlb_cgroup(struct page *page,
+static inline void set_hugetlb_cgroup(struct folio *folio,
 				     struct hugetlb_cgroup *h_cg)
 {
-	__set_hugetlb_cgroup(page_folio(page), h_cg, false);
+	__set_hugetlb_cgroup(folio, h_cg, false);
 }
 
-static inline void set_hugetlb_cgroup_rsvd(struct page *page,
+static inline void set_hugetlb_cgroup_rsvd(struct folio *folio,
 					  struct hugetlb_cgroup *h_cg)
 {
-	__set_hugetlb_cgroup(page_folio(page), h_cg, true);
+	__set_hugetlb_cgroup(folio, h_cg, true);
 }
 
 static inline bool hugetlb_cgroup_disabled(void)
@@ -199,12 +199,12 @@ hugetlb_cgroup_from_folio_rsvd(struct folio *folio)
 	return NULL;
 }
 
-static inline void set_hugetlb_cgroup(struct page *page,
+static inline void set_hugetlb_cgroup(struct folio *folio,
 				     struct hugetlb_cgroup *h_cg)
 {
 }
 
-static inline void set_hugetlb_cgroup_rsvd(struct page *page,
+static inline void set_hugetlb_cgroup_rsvd(struct folio *folio,
 					  struct hugetlb_cgroup *h_cg)
 {
 }

mm/hugetlb.c

@@ -1774,19 +1774,21 @@ static void __prep_account_new_huge_page(struct hstate *h, int nid)
 	h->nr_huge_pages_node[nid]++;
 }
 
-static void __prep_new_huge_page(struct hstate *h, struct page *page)
+static void __prep_new_hugetlb_folio(struct hstate *h, struct folio *folio)
 {
-	hugetlb_vmemmap_optimize(h, page);
-	INIT_LIST_HEAD(&page->lru);
-	set_compound_page_dtor(page, HUGETLB_PAGE_DTOR);
-	hugetlb_set_page_subpool(page, NULL);
-	set_hugetlb_cgroup(page, NULL);
-	set_hugetlb_cgroup_rsvd(page, NULL);
+	hugetlb_vmemmap_optimize(h, &folio->page);
+	INIT_LIST_HEAD(&folio->lru);
+	folio->_folio_dtor = HUGETLB_PAGE_DTOR;
+	hugetlb_set_folio_subpool(folio, NULL);
+	set_hugetlb_cgroup(folio, NULL);
+	set_hugetlb_cgroup_rsvd(folio, NULL);
 }
 
 static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
 {
-	__prep_new_huge_page(h, page);
+	struct folio *folio = page_folio(page);
+
+	__prep_new_hugetlb_folio(h, folio);
 	spin_lock_irq(&hugetlb_lock);
 	__prep_account_new_huge_page(h, nid);
 	spin_unlock_irq(&hugetlb_lock);
@@ -2748,8 +2750,10 @@ static int alloc_and_dissolve_huge_page(struct hstate *h, struct page *old_page,
 					struct list_head *list)
 {
 	gfp_t gfp_mask = htlb_alloc_mask(h) | __GFP_THISNODE;
-	int nid = page_to_nid(old_page);
+	struct folio *old_folio = page_folio(old_page);
+	int nid = folio_nid(old_folio);
 	struct page *new_page;
+	struct folio *new_folio;
 	int ret = 0;
 
 	/*
@@ -2762,16 +2766,17 @@ static int alloc_and_dissolve_huge_page(struct hstate *h, struct page *old_page,
 	new_page = alloc_buddy_huge_page(h, gfp_mask, nid, NULL, NULL);
 	if (!new_page)
 		return -ENOMEM;
-	__prep_new_huge_page(h, new_page);
+	new_folio = page_folio(new_page);
+	__prep_new_hugetlb_folio(h, new_folio);
 
 retry:
 	spin_lock_irq(&hugetlb_lock);
-	if (!PageHuge(old_page)) {
+	if (!folio_test_hugetlb(old_folio)) {
 		/*
 		 * Freed from under us. Drop new_page too.
 		 */
 		goto free_new;
-	} else if (page_count(old_page)) {
+	} else if (folio_ref_count(old_folio)) {
 		/*
 		 * Someone has grabbed the page, try to isolate it here.
 		 * Fail with -EBUSY if not possible.
@@ -2780,7 +2785,7 @@ static int alloc_and_dissolve_huge_page(struct hstate *h, struct page *old_page,
 		ret = isolate_hugetlb(old_page, list);
 		spin_lock_irq(&hugetlb_lock);
 		goto free_new;
-	} else if (!HPageFreed(old_page)) {
+	} else if (!folio_test_hugetlb_freed(old_folio)) {
 		/*
 		 * Page's refcount is 0 but it has not been enqueued in the
 		 * freelist yet. Race window is small, so we can succeed here if
@@ -2818,7 +2823,7 @@ static int alloc_and_dissolve_huge_page(struct hstate *h, struct page *old_page,
 free_new:
 	spin_unlock_irq(&hugetlb_lock);
 	/* Page has a zero ref count, but needs a ref to be freed */
-	set_page_refcounted(new_page);
+	folio_ref_unfreeze(new_folio, 1);
 	update_and_free_page(h, new_page, false);
 
 	return ret;

mm/hugetlb_cgroup.c

@@ -212,7 +212,7 @@ static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg,
 	/* Take the pages off the local counter */
 	page_counter_cancel(counter, nr_pages);
 
-	set_hugetlb_cgroup(page, parent);
+	set_hugetlb_cgroup(folio, parent);
 out:
 	return;
 }
@@ -891,6 +891,7 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
 	struct hugetlb_cgroup *h_cg_rsvd;
 	struct hstate *h = page_hstate(oldhpage);
 	struct folio *old_folio = page_folio(oldhpage);
+	struct folio *new_folio = page_folio(newhpage);
 
 	if (hugetlb_cgroup_disabled())
 		return;
@@ -898,12 +899,12 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
 	spin_lock_irq(&hugetlb_lock);
 	h_cg = hugetlb_cgroup_from_folio(old_folio);
 	h_cg_rsvd = hugetlb_cgroup_from_folio_rsvd(old_folio);
-	set_hugetlb_cgroup(oldhpage, NULL);
-	set_hugetlb_cgroup_rsvd(oldhpage, NULL);
+	set_hugetlb_cgroup(old_folio, NULL);
+	set_hugetlb_cgroup_rsvd(old_folio, NULL);
 
 	/* move the h_cg details to new cgroup */
-	set_hugetlb_cgroup(newhpage, h_cg);
-	set_hugetlb_cgroup_rsvd(newhpage, h_cg_rsvd);
+	set_hugetlb_cgroup(new_folio, h_cg);
+	set_hugetlb_cgroup_rsvd(new_folio, h_cg_rsvd);
 	list_move(&newhpage->lru, &h->hugepage_activelist);
 	spin_unlock_irq(&hugetlb_lock);
 	return;