The quilt patch titled
Subject: shmem: convert shmem_mfill_atomic_pte() to use a folio
has been removed from the -mm tree. Its filename was
shmem-convert-shmem_mfill_atomic_pte-to-use-a-folio.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: shmem: convert shmem_mfill_atomic_pte() to use a folio
Date: Fri, 2 Sep 2022 20:46:13 +0100
Assert that this is a single-page folio as there are several assumptions
in here that it's exactly PAGE_SIZE bytes large. Saves several calls to
compound_head() and removes the last caller of shmem_alloc_page().
Link: https://lkml.kernel.org/r/20220902194653.1739778-18-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/shmem.c | 45 +++++++++++++++++++--------------------------
1 file changed, 19 insertions(+), 26 deletions(-)
--- a/mm/shmem.c~shmem-convert-shmem_mfill_atomic_pte-to-use-a-folio
+++ a/mm/shmem.c
@@ -2374,12 +2374,6 @@ static struct inode *shmem_get_inode(str
}
#ifdef CONFIG_USERFAULTFD
-static struct page *shmem_alloc_page(gfp_t gfp,
- struct shmem_inode_info *info, pgoff_t index)
-{
- return &shmem_alloc_folio(gfp, info, index)->page;
-}
-
int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
pmd_t *dst_pmd,
struct vm_area_struct *dst_vma,
@@ -2395,7 +2389,6 @@ int shmem_mfill_atomic_pte(struct mm_str
pgoff_t pgoff = linear_page_index(dst_vma, dst_addr);
void *page_kaddr;
struct folio *folio;
- struct page *page;
int ret;
pgoff_t max_off;
@@ -2414,53 +2407,53 @@ int shmem_mfill_atomic_pte(struct mm_str
if (!*pagep) {
ret = -ENOMEM;
- page = shmem_alloc_page(gfp, info, pgoff);
- if (!page)
+ folio = shmem_alloc_folio(gfp, info, pgoff);
+ if (!folio)
goto out_unacct_blocks;
if (!zeropage) { /* COPY */
- page_kaddr = kmap_atomic(page);
+ page_kaddr = kmap_local_folio(folio, 0);
ret = copy_from_user(page_kaddr,
(const void __user *)src_addr,
PAGE_SIZE);
- kunmap_atomic(page_kaddr);
+ kunmap_local(page_kaddr);
/* fallback to copy_from_user outside mmap_lock */
if (unlikely(ret)) {
- *pagep = page;
+ *pagep = &folio->page;
ret = -ENOENT;
/* don't free the page */
goto out_unacct_blocks;
}
- flush_dcache_page(page);
+ flush_dcache_folio(folio);
} else { /* ZEROPAGE */
- clear_user_highpage(page, dst_addr);
+ clear_user_highpage(&folio->page, dst_addr);
}
} else {
- page = *pagep;
+ folio = page_folio(*pagep);
+ VM_BUG_ON_FOLIO(folio_test_large(folio), folio);
*pagep = NULL;
}
- VM_BUG_ON(PageLocked(page));
- VM_BUG_ON(PageSwapBacked(page));
- __SetPageLocked(page);
- __SetPageSwapBacked(page);
- __SetPageUptodate(page);
+ VM_BUG_ON(folio_test_locked(folio));
+ VM_BUG_ON(folio_test_swapbacked(folio));
+ __folio_set_locked(folio);
+ __folio_set_swapbacked(folio);
+ __folio_mark_uptodate(folio);
ret = -EFAULT;
max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
if (unlikely(pgoff >= max_off))
goto out_release;
- folio = page_folio(page);
ret = shmem_add_to_page_cache(folio, mapping, pgoff, NULL,
gfp & GFP_RECLAIM_MASK, dst_mm);
if (ret)
goto out_release;
ret = mfill_atomic_install_pte(dst_mm, dst_pmd, dst_vma, dst_addr,
- page, true, wp_copy);
+ &folio->page, true, wp_copy);
if (ret)
goto out_delete_from_cache;
@@ -2470,13 +2463,13 @@ int shmem_mfill_atomic_pte(struct mm_str
shmem_recalc_inode(inode);
spin_unlock_irq(&info->lock);
- unlock_page(page);
+ folio_unlock(folio);
return 0;
out_delete_from_cache:
- delete_from_page_cache(page);
+ filemap_remove_folio(folio);
out_release:
- unlock_page(page);
- put_page(page);
+ folio_unlock(folio);
+ folio_put(folio);
out_unacct_blocks:
shmem_inode_unacct_blocks(inode, 1);
return ret;
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
