linux-kernel - [PATCH v3 3/5] mm: memory: rename page_copy_prealloc() to folio

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Date:   Sat, 18 Nov 2023 10:32:30 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        Matthew Wilcox <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>,
        Vishal Moola <vishal.moola@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v3 3/5] mm: memory: rename page_copy_prealloc() to folio_prealloc()

Let's rename page_copy_prealloc() to folio_prealloc(), which could
be reused in more functons, as it maybe zero the new page, pass a
new need_zero to it, and call the vma_alloc_zeroed_movable_folio()
if need_zero is true.

Reviewed-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 mm/memory.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index dffd39c9b3af..93c9ed01fc86 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -990,12 +990,17 @@ copy_present_pte(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma,
 	return 0;
 }
 
-static inline struct folio *page_copy_prealloc(struct mm_struct *src_mm,
-		struct vm_area_struct *vma, unsigned long addr)
+static inline struct folio *folio_prealloc(struct mm_struct *src_mm,
+		struct vm_area_struct *vma, unsigned long addr, bool need_zero)
 {
 	struct folio *new_folio;
 
-	new_folio = vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0, vma, addr, false);
+	if (need_zero)
+		new_folio = vma_alloc_zeroed_movable_folio(vma, addr);
+	else
+		new_folio = vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0, vma,
+					    addr, false);
+
 	if (!new_folio)
 		return NULL;
 
@@ -1127,7 +1132,7 @@ copy_pte_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma,
 	} else if (ret == -EBUSY) {
 		goto out;
 	} else if (ret ==  -EAGAIN) {
-		prealloc = page_copy_prealloc(src_mm, src_vma, addr);
+		prealloc = folio_prealloc(src_mm, src_vma, addr, false);
 		if (!prealloc)
 			return -ENOMEM;
 	} else if (ret) {
-- 
2.27.0