linux-kernel - [PATCH v6 3/6] userfaultfd: convert copy_huge_page_from_user() to copy_folio_from

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Date:   Mon, 10 Apr 2023 21:39:29 +0800
From:   Peng Zhang <zhangpeng362@...wei.com>
To:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <akpm@...ux-foundation.org>, <willy@...radead.org>,
        <mike.kravetz@...cle.com>, <sidhartha.kumar@...cle.com>,
        <vishal.moola@...il.com>
CC:     <muchun.song@...ux.dev>, <wangkefeng.wang@...wei.com>,
        <sunnanyong@...wei.com>, ZhangPeng <zhangpeng362@...wei.com>
Subject: [PATCH v6 3/6] userfaultfd: convert copy_huge_page_from_user() to copy_folio_from_user()

From: ZhangPeng <zhangpeng362@...wei.com>

Replace copy_huge_page_from_user() with copy_folio_from_user().
copy_folio_from_user() does the same as copy_huge_page_from_user(), but
takes in a folio instead of a page. Convert page_kaddr to kaddr in
copy_folio_from_user() to do indenting cleanup.

Signed-off-by: ZhangPeng <zhangpeng362@...wei.com>
Reviewed-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
---
 include/linux/mm.h |  7 +++----
 mm/hugetlb.c       |  5 ++---
 mm/memory.c        | 23 +++++++++++------------
 mm/userfaultfd.c   |  6 ++----
 4 files changed, 18 insertions(+), 23 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 243bfba378c5..a978413b40a4 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3698,10 +3698,9 @@ extern void copy_user_huge_page(struct page *dst, struct page *src,
 				unsigned long addr_hint,
 				struct vm_area_struct *vma,
 				unsigned int pages_per_huge_page);
-extern long copy_huge_page_from_user(struct page *dst_page,
-				const void __user *usr_src,
-				unsigned int pages_per_huge_page,
-				bool allow_pagefault);
+long copy_folio_from_user(struct folio *dst_folio,
+			   const void __user *usr_src,
+			   bool allow_pagefault);
 
 /**
  * vma_is_special_huge - Are transhuge page-table entries considered special?
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 7e4a80769c9e..aade1b513474 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6217,9 +6217,8 @@ int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
 			goto out;
 		}
 
-		ret = copy_huge_page_from_user(&folio->page,
-						(const void __user *) src_addr,
-						pages_per_huge_page(h), false);
+		ret = copy_folio_from_user(folio, (const void __user *) src_addr,
+					   false);
 
 		/* fallback to copy_from_user outside mmap_lock */
 		if (unlikely(ret)) {
diff --git a/mm/memory.c b/mm/memory.c
index 808f354bce65..021cab989703 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5868,26 +5868,25 @@ void copy_user_huge_page(struct page *dst, struct page *src,
 	process_huge_page(addr_hint, pages_per_huge_page, copy_subpage, &arg);
 }
 
-long copy_huge_page_from_user(struct page *dst_page,
-				const void __user *usr_src,
-				unsigned int pages_per_huge_page,
-				bool allow_pagefault)
+long copy_folio_from_user(struct folio *dst_folio,
+			   const void __user *usr_src,
+			   bool allow_pagefault)
 {
-	void *page_kaddr;
+	void *kaddr;
 	unsigned long i, rc = 0;
-	unsigned long ret_val = pages_per_huge_page * PAGE_SIZE;
+	unsigned int nr_pages = folio_nr_pages(dst_folio);
+	unsigned long ret_val = nr_pages * PAGE_SIZE;
 	struct page *subpage;
 
-	for (i = 0; i < pages_per_huge_page; i++) {
-		subpage = nth_page(dst_page, i);
-		page_kaddr = kmap_local_page(subpage);
+	for (i = 0; i < nr_pages; i++) {
+		subpage = folio_page(dst_folio, i);
+		kaddr = kmap_local_page(subpage);
 		if (!allow_pagefault)
 			pagefault_disable();
-		rc = copy_from_user(page_kaddr,
-				usr_src + i * PAGE_SIZE, PAGE_SIZE);
+		rc = copy_from_user(kaddr, usr_src + i * PAGE_SIZE, PAGE_SIZE);
 		if (!allow_pagefault)
 			pagefault_enable();
-		kunmap_local(page_kaddr);
+		kunmap_local(kaddr);
 
 		ret_val -= (PAGE_SIZE - rc);
 		if (rc)
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 313bc683c2b6..1e7dba6c4c5f 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -421,10 +421,8 @@ static __always_inline ssize_t mfill_atomic_hugetlb(
 			mmap_read_unlock(dst_mm);
 			BUG_ON(!page);
 
-			err = copy_huge_page_from_user(page,
-						(const void __user *)src_addr,
-						vma_hpagesize / PAGE_SIZE,
-						true);
+			err = copy_folio_from_user(page_folio(page),
+						   (const void __user *)src_addr, true);
 			if (unlikely(err)) {
 				err = -EFAULT;
 				goto out;
-- 
2.25.1