linux-kernel - [PATCH mm-unstable v3 03/10] mm/hugetlb: convert dissolve_free_huge

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Date:   Thu, 17 Nov 2022 13:14:54 -0800
From:   Sidhartha Kumar <sidhartha.kumar@...cle.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     akpm@...ux-foundation.org, songmuchun@...edance.com,
        mike.kravetz@...cle.com, willy@...radead.org,
        almasrymina@...gle.com, linmiaohe@...wei.com, hughd@...gle.com,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH mm-unstable v3 03/10] mm/hugetlb: convert dissolve_free_huge_page() to folios

Removes compound_head() call by using a folio rather than a head page.

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
---
 mm/hugetlb.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 5edb81541ede..ff609efe5497 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2126,21 +2126,21 @@ static struct page *remove_pool_huge_page(struct hstate *h,
 int dissolve_free_huge_page(struct page *page)
 {
 	int rc = -EBUSY;
+	struct folio *folio = page_folio(page);
 
 retry:
 	/* Not to disrupt normal path by vainly holding hugetlb_lock */
-	if (!PageHuge(page))
+	if (!folio_test_hugetlb(folio))
 		return 0;
 
 	spin_lock_irq(&hugetlb_lock);
-	if (!PageHuge(page)) {
+	if (!folio_test_hugetlb(folio)) {
 		rc = 0;
 		goto out;
 	}
 
-	if (!page_count(page)) {
-		struct page *head = compound_head(page);
-		struct hstate *h = page_hstate(head);
+	if (!folio_ref_count(folio)) {
+		struct hstate *h = folio_hstate(folio);
 		if (!available_huge_pages(h))
 			goto out;
 
@@ -2148,7 +2148,7 @@ int dissolve_free_huge_page(struct page *page)
 		 * We should make sure that the page is already on the free list
 		 * when it is dissolved.
 		 */
-		if (unlikely(!HPageFreed(head))) {
+		if (unlikely(!folio_test_hugetlb_freed(folio))) {
 			spin_unlock_irq(&hugetlb_lock);
 			cond_resched();
 
@@ -2163,7 +2163,7 @@ int dissolve_free_huge_page(struct page *page)
 			goto retry;
 		}
 
-		remove_hugetlb_page(h, head, false);
+		remove_hugetlb_page(h, &folio->page, false);
 		h->max_huge_pages--;
 		spin_unlock_irq(&hugetlb_lock);
 
@@ -2175,12 +2175,12 @@ int dissolve_free_huge_page(struct page *page)
 		 * Attempt to allocate vmemmmap here so that we can take
 		 * appropriate action on failure.
 		 */
-		rc = hugetlb_vmemmap_restore(h, head);
+		rc = hugetlb_vmemmap_restore(h, &folio->page);
 		if (!rc) {
-			update_and_free_page(h, head, false);
+			update_and_free_page(h, &folio->page, false);
 		} else {
 			spin_lock_irq(&hugetlb_lock);
-			add_hugetlb_page(h, head, false);
+			add_hugetlb_page(h, &folio->page, false);
 			h->max_huge_pages++;
 			spin_unlock_irq(&hugetlb_lock);
 		}
-- 
2.38.1