linux-kernel - Re: [PATCH 5/9] iomap: Support arbitrarily many blocks per page

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Date:   Thu, 27 Aug 2020 09:26:36 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/9] iomap: Support arbitrarily many blocks per page

>  static inline struct iomap_page *to_iomap_page(struct page *page)
>  {
> +	VM_BUG_ON_PGFLAGS(PageTail(page), page);
>  	if (page_has_private(page))
>  		return (struct iomap_page *)page_private(page);
>  	return NULL;

Nit: can you add an empty line after the VM_BUG_ON_PGFLAGS assert to
keep the function readable?  Maybe also add a comment on the assert,
as it isn't totally obvious.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@....de>