linux-kernel - [PATCH mm-unstable v3 6/8] mm/hugetlb: convert alloc_migrate_huge

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Date:   Fri, 13 Jan 2023 16:30:55 -0600
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, jhubbard@...dia.com,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH mm-unstable v3 6/8] mm/hugetlb: convert alloc_migrate_huge_page to folios

Change alloc_huge_page_nodemask() to alloc_hugetlb_folio_nodemask() and
alloc_migrate_huge_page() to alloc_migrate_hugetlb_folio(). Both functions
now return a folio rather than a page.

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
---
 include/linux/hugetlb.h |  6 +++---
 mm/hugetlb.c            | 18 +++++++++---------
 mm/migrate.c            |  5 ++++-
 3 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 482929b2d044..a853c13d8308 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -680,7 +680,7 @@ struct huge_bootmem_page {
 int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
 struct page *alloc_huge_page(struct vm_area_struct *vma,
 				unsigned long addr, int avoid_reserve);
-struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
+struct folio *alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
 				nodemask_t *nmask, gfp_t gfp_mask);
 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
 				unsigned long address);
@@ -1001,8 +1001,8 @@ static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
 	return NULL;
 }
 
-static inline struct page *
-alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
+static inline struct folio *
+alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
 			nodemask_t *nmask, gfp_t gfp_mask)
 {
 	return NULL;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f3e1d052b40c..c0cfb075cd58 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2275,7 +2275,7 @@ static struct folio *alloc_surplus_hugetlb_folio(struct hstate *h,
 	return folio;
 }
 
-static struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask,
+static struct folio *alloc_migrate_hugetlb_folio(struct hstate *h, gfp_t gfp_mask,
 				     int nid, nodemask_t *nmask)
 {
 	struct folio *folio;
@@ -2295,7 +2295,7 @@ static struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask,
 	 */
 	folio_set_hugetlb_temporary(folio);
 
-	return &folio->page;
+	return folio;
 }
 
 /*
@@ -2328,8 +2328,8 @@ struct folio *alloc_buddy_hugetlb_folio_with_mpol(struct hstate *h,
 	return folio;
 }
 
-/* page migration callback function */
-struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
+/* folio migration callback function */
+struct folio *alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
 		nodemask_t *nmask, gfp_t gfp_mask)
 {
 	spin_lock_irq(&hugetlb_lock);
@@ -2340,12 +2340,12 @@ struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
 						preferred_nid, nmask);
 		if (folio) {
 			spin_unlock_irq(&hugetlb_lock);
-			return &folio->page;
+			return folio;
 		}
 	}
 	spin_unlock_irq(&hugetlb_lock);
 
-	return alloc_migrate_huge_page(h, gfp_mask, preferred_nid, nmask);
+	return alloc_migrate_hugetlb_folio(h, gfp_mask, preferred_nid, nmask);
 }
 
 /* mempolicy aware migration callback */
@@ -2354,16 +2354,16 @@ struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
 {
 	struct mempolicy *mpol;
 	nodemask_t *nodemask;
-	struct page *page;
+	struct folio *folio;
 	gfp_t gfp_mask;
 	int node;
 
 	gfp_mask = htlb_alloc_mask(h);
 	node = huge_node(vma, address, gfp_mask, &mpol, &nodemask);
-	page = alloc_huge_page_nodemask(h, node, nodemask, gfp_mask);
+	folio = alloc_hugetlb_folio_nodemask(h, node, nodemask, gfp_mask);
 	mpol_cond_put(mpol);
 
-	return page;
+	return &folio->page;
 }
 
 /*
diff --git a/mm/migrate.c b/mm/migrate.c
index 6932b3d5a9dd..fab706b78be1 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1622,6 +1622,7 @@ struct page *alloc_migration_target(struct page *page, unsigned long private)
 	struct migration_target_control *mtc;
 	gfp_t gfp_mask;
 	unsigned int order = 0;
+	struct folio *hugetlb_folio = NULL;
 	struct folio *new_folio = NULL;
 	int nid;
 	int zidx;
@@ -1636,7 +1637,9 @@ struct page *alloc_migration_target(struct page *page, unsigned long private)
 		struct hstate *h = folio_hstate(folio);
 
 		gfp_mask = htlb_modify_alloc_mask(h, gfp_mask);
-		return alloc_huge_page_nodemask(h, nid, mtc->nmask, gfp_mask);
+		hugetlb_folio = alloc_hugetlb_folio_nodemask(h, nid,
+						mtc->nmask, gfp_mask);
+		return &hugetlb_folio->page;
 	}
 
 	if (folio_test_large(folio)) {
-- 
2.39.0