linux-kernel - Re: [PATCH v2 19/46] mm/migrate: Add folio_migrate

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Date:   Wed, 23 Jun 2021 10:28:52 +0200
From:   Christoph Hellwig <hch@...radead.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 19/46] mm/migrate: Add folio_migrate_flags()

>  	/*
>  	 * Please do not reorder this without considering how mm/ksm.c's
>  	 * get_ksm_page() depends upon ksm_migrate_page() and PageSwapCache().
>  	 */
> -	if (PageSwapCache(page))
> -		ClearPageSwapCache(page);
> -	ClearPagePrivate(page);
> -	set_page_private(page, 0);
> +	if (folio_swapcache(folio))
> +		folio_clear_swapcache_flag(folio);
> +	folio_clear_private_flag(folio);
> +
> +	/* page->private contains hugetlb specific flags */
> +	if (!folio_hugetlb(folio))
> +		folio->private = NULL;

Ymmm. Dosn't the ->private handling change now?  Given that you
added a comment it seems intentional, but I do not understand why
it changes as part of the conversion.