linux-kernel - Re: [PATCH v6 14/26] rmap: Add support for PUD sized mappings to rmap

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Message-ID: <6785bc243cd6f_20fa29423@dwillia2-xfh.jf.intel.com.notmuch>
Date: Mon, 13 Jan 2025 17:21:40 -0800
From: Dan Williams <dan.j.williams@...el.com>
To: Alistair Popple <apopple@...dia.com>, <akpm@...ux-foundation.org>,
	<dan.j.williams@...el.com>, <linux-mm@...ck.org>
CC: <alison.schofield@...el.com>, Alistair Popple <apopple@...dia.com>,
	<lina@...hilina.net>, <zhang.lyra@...il.com>,
	<gerald.schaefer@...ux.ibm.com>, <vishal.l.verma@...el.com>,
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Subject: Re: [PATCH v6 14/26] rmap: Add support for PUD sized mappings to rmap

Alistair Popple wrote:
> The rmap doesn't currently support adding a PUD mapping of a
> folio. This patch adds support for entire PUD mappings of folios,
> primarily to allow for more standard refcounting of device DAX
> folios. Currently DAX is the only user of this and it doesn't require
> support for partially mapped PUD-sized folios so we don't support for
> that for now.
> 
> Signed-off-by: Alistair Popple <apopple@...dia.com>
> Acked-by: David Hildenbrand <david@...hat.com>
> 
> ---
> 
> Changes for v6:
> 
>  - Minor comment formatting fix
>  - Add an additional check for CONFIG_TRANSPARENT_HUGEPAGE to fix a
>    build breakage when CONFIG_PGTABLE_HAS_HUGE_LEAVES is not defined.
> 
> Changes for v5:
> 
>  - Fixed accounting as suggested by David.
> 
> Changes for v4:
> 
>  - New for v4, split out rmap changes as suggested by David.
> ---
>  include/linux/rmap.h | 15 ++++++++++-
>  mm/rmap.c            | 67 ++++++++++++++++++++++++++++++++++++++++++---
>  2 files changed, 78 insertions(+), 4 deletions(-)

Looks mechanically correct to me.

Reviewed-by: Dan Williams <dan.j.williams@...el.com>