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

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Date:   Tue, 22 Aug 2023 17:24:18 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Peter Xu <peterx@...hat.com>, Will Deacon <will@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Vitaly Wool <vitaly.wool@...sulko.com>
Subject: Re: [PATCH mm-unstable v1 1/4] mm/swap: stop using page->private on
 tail pages for THP_SWAP

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@....com>