Re: [PATCH v2 09/28] gup: Turn hpage_pincount_add() into page_pincount_add()

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To: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: Re: [PATCH v2 09/28] gup: Turn hpage_pincount_add() into page_pincount_add()
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 10 Jan 2022 00:31:39 -0800
Cc: linux-mm@xxxxxxxxx, John Hubbard <jhubbard@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, William Kucharski <william.kucharski@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Jason Gunthorpe <jgg@xxxxxxxx>
In-reply-to: <20220110042406.499429-10-willy@infradead.org>
References: <20220110042406.499429-1-willy@infradead.org> <20220110042406.499429-10-willy@infradead.org>

On Mon, Jan 10, 2022 at 04:23:47AM +0000, Matthew Wilcox (Oracle) wrote:
> Simplify try_grab_compound_head() and remove an unnecessary
> VM_BUG_ON by handling pages both with and without a pincount field in
> page_pincount_add().

Nice:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>

References:
- [PATCH v2 00/28] Convert GUP to folios
  - From: Matthew Wilcox (Oracle)
- [PATCH v2 09/28] gup: Turn hpage_pincount_add() into page_pincount_add()
  - From: Matthew Wilcox (Oracle)

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