The patch titled
Subject: userfaultfd: convert copy_huge_page_from_user() to copy_folio_from_user()
has been added to the -mm mm-unstable branch. Its filename is
userfaultfd-convert-copy_huge_page_from_user-to-copy_folio_from_user.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/userfaultfd-convert-copy_huge_page_from_user-to-copy_folio_from_user.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: ZhangPeng <zhangpeng362@xxxxxxxxxx>
Subject: userfaultfd: convert copy_huge_page_from_user() to copy_folio_from_user()
Date: Mon, 10 Apr 2023 21:39:29 +0800
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.
Link: https://lkml.kernel.org/r/20230410133932.32288-4-zhangpeng362@xxxxxxxxxx
Signed-off-by: ZhangPeng <zhangpeng362@xxxxxxxxxx>
Reviewed-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Nanyong Sun <sunnanyong@xxxxxxxxxx>
Cc: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 7 +++----
mm/hugetlb.c | 5 ++---
mm/memory.c | 23 +++++++++++------------
mm/userfaultfd.c | 6 ++----
4 files changed, 18 insertions(+), 23 deletions(-)
--- a/include/linux/mm.h~userfaultfd-convert-copy_huge_page_from_user-to-copy_folio_from_user
+++ a/include/linux/mm.h
@@ -3698,10 +3698,9 @@ extern void copy_user_huge_page(struct p
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?
--- a/mm/hugetlb.c~userfaultfd-convert-copy_huge_page_from_user-to-copy_folio_from_user
+++ a/mm/hugetlb.c
@@ -6207,9 +6207,8 @@ int hugetlb_mfill_atomic_pte(pte_t *dst_
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)) {
--- a/mm/memory.c~userfaultfd-convert-copy_huge_page_from_user-to-copy_folio_from_user
+++ a/mm/memory.c
@@ -5854,26 +5854,25 @@ void copy_user_huge_page(struct page *ds
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)
--- a/mm/userfaultfd.c~userfaultfd-convert-copy_huge_page_from_user-to-copy_folio_from_user
+++ a/mm/userfaultfd.c
@@ -421,10 +421,8 @@ retry:
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;
_
Patches currently in -mm which might be from zhangpeng362@xxxxxxxxxx are
mm-madvise-use-vma_lookup-instead-of-find_vma.patch
userfaultfd-convert-mfill_atomic_pte_copy-to-use-a-folio.patch
userfaultfd-use-kmap_local_page-in-copy_huge_page_from_user.patch
userfaultfd-convert-copy_huge_page_from_user-to-copy_folio_from_user.patch
userfaultfd-convert-mfill_atomic_hugetlb-to-use-a-folio.patch
mm-convert-copy_user_huge_page-to-copy_user_large_folio.patch
userfaultfd-convert-mfill_atomic-to-use-a-folio.patch
