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From:   Sidhartha Kumar <sidhartha.kumar@oracle.com>
To:     linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc:     akpm@linux-foundation.org, songmuchun@bytedance.com,
        mike.kravetz@oracle.com, willy@infradead.org,
        almasrymina@google.com, linmiaohe@huawei.com, hughd@google.com,
        Sidhartha Kumar <sidhartha.kumar@oracle.com>
Subject: [PATCH mm-unstable 08/10] mm/hugetlb: convert free_gigantic_page() to folios
Date:   Tue, 15 Nov 2022 13:22:15 -0800
Message-Id: <20221115212217.19539-9-sidhartha.kumar@oracle.com>
In-Reply-To: <20221115212217.19539-1-sidhartha.kumar@oracle.com>
References: <20221115212217.19539-1-sidhartha.kumar@oracle.com>
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Convert callers of free_gigantic_page() to use folios, function is then
renamed to free_gigantic_folio().

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
---
 mm/hugetlb.c | 31 ++++++++++++++++++-------------
 1 file changed, 18 insertions(+), 13 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ebb98c1af2fb..bc039ff28b8f 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1352,18 +1352,20 @@ static void destroy_compound_gigantic_folio(struct folio *folio,
 	__destroy_compound_gigantic_folio(folio, order, false);
 }
 
-static void free_gigantic_page(struct page *page, unsigned int order)
+static void free_gigantic_folio(struct folio *folio, unsigned int order)
 {
 	/*
 	 * If the page isn't allocated using the cma allocator,
 	 * cma_release() returns false.
 	 */
 #ifdef CONFIG_CMA
-	if (cma_release(hugetlb_cma[page_to_nid(page)], page, 1 << order))
+	int nid = folio_nid(folio);
+
+	if (cma_release(hugetlb_cma[nid], &folio->page, 1 << order))
 		return;
 #endif
 
-	free_contig_range(page_to_pfn(page), 1 << order);
+	free_contig_range(folio_pfn(folio), 1 << order);
 }
 
 #ifdef CONFIG_CONTIG_ALLOC
@@ -1417,7 +1419,8 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
 {
 	return NULL;
 }
-static inline void free_gigantic_page(struct page *page, unsigned int order) { }
+static inline void free_gigantic_folio(struct folio *folio,
+						unsigned int order) { }
 static inline void destroy_compound_gigantic_folio(struct folio *folio,
 						unsigned int order) { }
 #endif
@@ -1556,7 +1559,7 @@ static void __update_and_free_page(struct hstate *h, struct page *page)
 	 * If we don't know which subpages are hwpoisoned, we can't free
 	 * the hugepage, so it's leaked intentionally.
 	 */
-	if (HPageRawHwpUnreliable(page))
+	if (folio_test_hugetlb_raw_hwp_unreliable(folio))
 		return;
 
 	if (hugetlb_vmemmap_restore(h, page)) {
@@ -1566,7 +1569,7 @@ static void __update_and_free_page(struct hstate *h, struct page *page)
 		 * page and put the page back on the hugetlb free list and treat
 		 * as a surplus page.
 		 */
-		add_hugetlb_folio(h, page_folio(page), true);
+		add_hugetlb_folio(h, folio, true);
 		spin_unlock_irq(&hugetlb_lock);
 		return;
 	}
@@ -1579,7 +1582,7 @@ static void __update_and_free_page(struct hstate *h, struct page *page)
 		hugetlb_clear_page_hwpoison(&folio->page);
 
 	for (i = 0; i < pages_per_huge_page(h); i++) {
-		subpage = nth_page(page, i);
+		subpage = folio_page(folio, i);
 		subpage->flags &= ~(1 << PG_locked | 1 << PG_error |
 				1 << PG_referenced | 1 << PG_dirty |
 				1 << PG_active | 1 << PG_private |
@@ -1588,12 +1591,12 @@ static void __update_and_free_page(struct hstate *h, struct page *page)
 
 	/*
 	 * Non-gigantic pages demoted from CMA allocated gigantic pages
-	 * need to be given back to CMA in free_gigantic_page.
+	 * need to be given back to CMA in free_gigantic_folio.
 	 */
 	if (hstate_is_gigantic(h) ||
 	    hugetlb_cma_folio(folio, huge_page_order(h))) {
 		destroy_compound_gigantic_folio(folio, huge_page_order(h));
-		free_gigantic_page(page, huge_page_order(h));
+		free_gigantic_folio(folio, huge_page_order(h));
 	} else {
 		__free_pages(page, huge_page_order(h));
 	}
@@ -2013,6 +2016,7 @@ static struct page *alloc_fresh_huge_page(struct hstate *h,
 		nodemask_t *node_alloc_noretry)
 {
 	struct page *page;
+	struct folio *folio;
 	bool retry = false;
 
 retry:
@@ -2023,14 +2027,14 @@ static struct page *alloc_fresh_huge_page(struct hstate *h,
 				nid, nmask, node_alloc_noretry);
 	if (!page)
 		return NULL;
-
+	folio = page_folio(page);
 	if (hstate_is_gigantic(h)) {
 		if (!prep_compound_gigantic_page(page, huge_page_order(h))) {
 			/*
 			 * Rare failure to convert pages to compound page.
 			 * Free pages and try again - ONCE!
 			 */
-			free_gigantic_page(page, huge_page_order(h));
+			free_gigantic_folio(folio, huge_page_order(h));
 			if (!retry) {
 				retry = true;
 				goto retry;
@@ -2038,7 +2042,7 @@ static struct page *alloc_fresh_huge_page(struct hstate *h,
 			return NULL;
 		}
 	}
-	prep_new_huge_page(h, page, page_to_nid(page));
+	prep_new_huge_page(h, page, folio_nid(folio));
 
 	return page;
 }
@@ -3039,6 +3043,7 @@ static void __init gather_bootmem_prealloc(void)
 
 	list_for_each_entry(m, &huge_boot_pages, list) {
 		struct page *page = virt_to_page(m);
+		struct folio *folio = page_folio(page);
 		struct hstate *h = m->hstate;
 
 		VM_BUG_ON(!hstate_is_gigantic(h));
@@ -3049,7 +3054,7 @@ static void __init gather_bootmem_prealloc(void)
 			free_huge_page(page); /* add to the hugepage allocator */
 		} else {
 			/* VERY unlikely inflated ref count on a tail page */
-			free_gigantic_page(page, huge_page_order(h));
+			free_gigantic_folio(folio, huge_page_order(h));
 		}
 
 		/*
-- 
2.38.1