[PATCH mm-unstable v1 1/4] mm/swap: stop using page->private on tail pages for THP_SWAP

[Catalin Marinas]

On Mon, Aug 21, 2023 at 06:08:46PM +0200, David Hildenbrand wrote:
> diff --git a/arch/arm64/mm/mteswap.c b/arch/arm64/mm/mteswap.c
> index cd508ba80ab1..a31833e3ddc5 100644
> --- a/arch/arm64/mm/mteswap.c
> +++ b/arch/arm64/mm/mteswap.c
> @@ -33,8 +33,9 @@ int mte_save_tags(struct page *page)
>  
>  	mte_save_page_tags(page_address(page), tag_storage);
>  
> -	/* page_private contains the swap entry.val set in do_swap_page */
> -	ret = xa_store(&mte_pages, page_private(page), tag_storage, GFP_KERNEL);
> +	/* lookup the swap entry.val from the page */
> +	ret = xa_store(&mte_pages, page_swap_entry(page).val, tag_storage,
> +		       GFP_KERNEL);
>  	if (WARN(xa_is_err(ret), "Failed to store MTE tags")) {
>  		mte_free_tag_storage(tag_storage);
>  		return xa_err(ret);

For arm64:

Acked-by: Catalin Marinas <catalin.marinas at arm.com>