linux-kernel - [PATCH v2 5/8] mm/hugetlb: convert restore_reserve_on

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Message-Id: <20230125170537.96973-6-sidhartha.kumar@oracle.com>
Date:   Wed, 25 Jan 2023 09:05:34 -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, jhubbard@...dia.com,
        gerald.schaefer@...ux.ibm.com,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH v2 5/8] mm/hugetlb: convert restore_reserve_on_error to take in a folio

Every caller of restore_reserve_on_error() is now passing in &folio->page,
change the function to take in a folio directly and clean up the call
sites.

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
---
 fs/hugetlbfs/inode.c    |  2 +-
 include/linux/hugetlb.h |  2 +-
 mm/hugetlb.c            | 21 ++++++++++-----------
 3 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index ac16ada48f75..e2b8a00696bd 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -873,7 +873,7 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
 		__folio_mark_uptodate(folio);
 		error = hugetlb_add_to_page_cache(&folio->page, mapping, index);
 		if (unlikely(error)) {
-			restore_reserve_on_error(h, &pseudo_vma, addr, &folio->page);
+			restore_reserve_on_error(h, &pseudo_vma, addr, folio);
 			folio_put(folio);
 			mutex_unlock(&hugetlb_fault_mutex_table[hash]);
 			goto out;
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index f6849e67ffef..d46f9db09a2c 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -725,7 +725,7 @@ struct folio *alloc_hugetlb_folio_vma(struct hstate *h, struct vm_area_struct *v
 int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,
 			pgoff_t idx);
 void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
-				unsigned long address, struct page *page);
+				unsigned long address, struct folio *folio);
 
 /* arch callback */
 int __init __alloc_bootmem_huge_page(struct hstate *h, int nid);
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e104dba1e5ea..aad028706fbc 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2802,9 +2802,9 @@ static long vma_del_reservation(struct hstate *h,
  * and the hugetlb mutex should remain held when calling this routine.
  *
  * It handles two specific cases:
- * 1) A reservation was in place and the page consumed the reservation.
- *    HPageRestoreReserve is set in the page.
- * 2) No reservation was in place for the page, so HPageRestoreReserve is
+ * 1) A reservation was in place and the folio consumed the reservation.
+ *    hugetlb_restore_reserve is set in the folio.
+ * 2) No reservation was in place for the page, so hugetlb_restore_reserve is
  *    not set.  However, alloc_hugetlb_folio always updates the reserve map.
  *
  * In case 1, free_huge_page later in the error path will increment the
@@ -2817,9 +2817,8 @@ static long vma_del_reservation(struct hstate *h,
  * In case 2, simply undo reserve map modifications done by alloc_hugetlb_folio.
  */
 void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
-			unsigned long address, struct page *page)
+			unsigned long address, struct folio *folio)
 {
-	struct folio *folio = page_folio(page);
 	long rc = vma_needs_reservation(h, vma, address);
 
 	if (folio_test_hugetlb_restore_reserve(folio)) {
@@ -5102,7 +5101,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
 				entry = huge_ptep_get(src_pte);
 				if (!pte_same(src_pte_old, entry)) {
 					restore_reserve_on_error(h, dst_vma, addr,
-								&new_folio->page);
+								new_folio);
 					folio_put(new_folio);
 					/* huge_ptep of dst_pte won't change as in child */
 					goto again;
@@ -5634,7 +5633,7 @@ static vm_fault_t hugetlb_wp(struct mm_struct *mm, struct vm_area_struct *vma,
 	 * unshare)
 	 */
 	if (new_folio != page_folio(old_page))
-		restore_reserve_on_error(h, vma, haddr, &new_folio->page);
+		restore_reserve_on_error(h, vma, haddr, new_folio);
 	folio_put(new_folio);
 out_release_old:
 	put_page(old_page);
@@ -5846,7 +5845,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
 				 * to the page cache. So it's safe to call
 				 * restore_reserve_on_error() here.
 				 */
-				restore_reserve_on_error(h, vma, haddr, &folio->page);
+				restore_reserve_on_error(h, vma, haddr, folio);
 				folio_put(folio);
 				goto out;
 			}
@@ -5947,7 +5946,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
 	spin_unlock(ptl);
 backout_unlocked:
 	if (new_folio && !new_pagecache_folio)
-		restore_reserve_on_error(h, vma, haddr, &folio->page);
+		restore_reserve_on_error(h, vma, haddr, folio);
 
 	folio_unlock(folio);
 	folio_put(folio);
@@ -6210,7 +6209,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
 			/* Free the allocated folio which may have
 			 * consumed a reservation.
 			 */
-			restore_reserve_on_error(h, dst_vma, dst_addr, &folio->page);
+			restore_reserve_on_error(h, dst_vma, dst_addr, folio);
 			folio_put(folio);
 
 			/* Allocate a temporary folio to hold the copied
@@ -6339,7 +6338,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
 		folio_unlock(folio);
 out_release_nounlock:
 	if (!folio_in_pagecache)
-		restore_reserve_on_error(h, dst_vma, dst_addr, &folio->page);
+		restore_reserve_on_error(h, dst_vma, dst_addr, folio);
 	folio_put(folio);
 	goto out;
 }
-- 
2.39.1