Re: [PATCHv3 02/11] drm/i915/gem: Convert __shmem_writeback() to folios

[Shakeel Butt <shakeel.butt@linux.dev>]

On Thu, Jan 30, 2025 at 12:00:40PM +0200, Kirill A. Shutemov wrote:
> Use folios instead of pages.
> 
> This is preparation for removing PG_reclaim.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Acked-by: David Hildenbrand <david@redhat.com>
> ---
>  drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
> index fe69f2c8527d..9016832b20fc 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
> @@ -320,25 +320,25 @@ void __shmem_writeback(size_t size, struct address_space *mapping)
>  
>  	/* Begin writeback on each dirty page */
>  	for (i = 0; i < size >> PAGE_SHIFT; i++) {

With folio conversion, should the iteration step be folio_nr_pages()
instead of 1?

> -		struct page *page;
> +		struct folio *folio;
>  
> -		page = find_lock_page(mapping, i);
> -		if (!page)
> +		folio = filemap_lock_folio(mapping, i);
> +		if (!folio)
>  			continue;
>  
> -		if (!page_mapped(page) && clear_page_dirty_for_io(page)) {
> +		if (!folio_mapped(folio) && folio_clear_dirty_for_io(folio)) {
>  			int ret;
>  
> -			SetPageReclaim(page);
> -			ret = mapping->a_ops->writepage(page, &wbc);
> +			folio_set_reclaim(folio);
> +			ret = mapping->a_ops->writepage(&folio->page, &wbc);
>  			if (!PageWriteback(page))
> -				ClearPageReclaim(page);
> +				folio_clear_reclaim(folio);
>  			if (!ret)
>  				goto put;
>  		}
> -		unlock_page(page);
> +		folio_unlock(folio);
>  put:
> -		put_page(page);
> +		folio_put(folio);
>  	}
>  }
>  
> -- 
> 2.47.2
>