linux-kernel - Re: [PATCH v2 24/46] mm/writeback: Add __folio_end

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Message-ID: <YNL7yxWFqlL7/Fd+@infradead.org>
Date:   Wed, 23 Jun 2021 11:15:55 +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 24/46] mm/writeback: Add __folio_end_writeback()

On Tue, Jun 22, 2021 at 01:15:29PM +0100, Matthew Wilcox (Oracle) wrote:
> test_clear_page_writeback() is actually an mm-internal function, although
> it's named as if it's a pagecache function.  Move it to mm/internal.h,
> rename it to __folio_end_writeback() and change the return type to bool.
> 
> The conversion from page to folio is mostly about accounting the number
> of pages being written back, although it does eliminate a couple of
> calls to compound_head().

While this looks good, I think the whole abstraction is wrong.  I think
test_clear_page_writeback should just be merged into it's only caller.

But if that is somehow not on the table this change looks ok:

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