On Mon, Aug 24, 2020 at 03:55:04PM +0100, Matthew Wilcox (Oracle) wrote:
> We can skip most of the initialisation, although spinlocks still
> need explicit initialisation as architectures may use a non-zero
> value to indicate unlocked.  The comment is no longer useful as
> attach_page_private() handles the refcount now.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <wi...@infradead.org>
> Reviewed-by: Christoph Hellwig <h...@lst.de>

Looks good to me,
Reviewed-by: Darrick J. Wong <darrick.w...@oracle.com>

--D

> ---
>  fs/iomap/buffered-io.c | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index 13d5cdab8dcd..639d54a4177e 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -49,16 +49,8 @@ iomap_page_create(struct inode *inode, struct page *page)
>       if (iop || i_blocks_per_page(inode, page) <= 1)
>               return iop;
>  
> -     iop = kmalloc(sizeof(*iop), GFP_NOFS | __GFP_NOFAIL);
> -     atomic_set(&iop->read_count, 0);
> -     atomic_set(&iop->write_count, 0);
> +     iop = kzalloc(sizeof(*iop), GFP_NOFS | __GFP_NOFAIL);
>       spin_lock_init(&iop->uptodate_lock);
> -     bitmap_zero(iop->uptodate, PAGE_SIZE / SECTOR_SIZE);
> -
> -     /*
> -      * migrate_page_move_mapping() assumes that pages with private data have
> -      * their count elevated by 1.
> -      */
>       attach_page_private(page, iop);
>       return iop;
>  }
> -- 
> 2.28.0
> 
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