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mm: Use folio_next_pos()

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This is one instruction more efficient than open-coding folio_pos() +
folio_size().  It's the equivalent of (x + y) << z rather than
x << z + y << z.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://patch.msgid.link/20251024170822.1427218-11-willy@infradead.org
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle)
2025-10-24 18:08:18 +01:00
committed by Christian Brauner
parent ac0a11113d
commit 60a70e6143
2 changed files with 2 additions and 2 deletions
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2
mm/shmem.c
View File

@@ -1133,7 +1133,7 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
same_folio = (lstart >> PAGE_SHIFT) == (lend >> PAGE_SHIFT);
folio = shmem_get_partial_folio(inode, lstart >> PAGE_SHIFT);
if (folio) {
same_folio = lend < folio_pos(folio) + folio_size(folio);
same_folio = lend < folio_next_pos(folio);
folio_mark_dirty(folio);
if (!truncate_inode_partial_folio(folio, lstart, lend)) {
start = folio_next_index(folio);

2
mm/truncate.c
View File

@@ -387,7 +387,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
same_folio = (lstart >> PAGE_SHIFT) == (lend >> PAGE_SHIFT);
folio = __filemap_get_folio(mapping, lstart >> PAGE_SHIFT, FGP_LOCK, 0);
if (!IS_ERR(folio)) {
same_folio = lend < folio_pos(folio) + folio_size(folio);
same_folio = lend < folio_next_pos(folio);
if (!truncate_inode_partial_folio(folio, lstart, lend)) {
start = folio_next_index(folio);
if (same_folio)