Re: [PATCH v6 08/26] fs/dax: Remove PAGE_MAPPING_DAX_SHARED mapping flag

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Subject: Re: [PATCH v6 08/26] fs/dax: Remove PAGE_MAPPING_DAX_SHARED mapping flag
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Tue, 14 Jan 2025 15:47:44 +0100
Cc: alison.schofield@xxxxxxxxx, lina@xxxxxxxxxxxxx, zhang.lyra@xxxxxxxxx, gerald.schaefer@xxxxxxxxxxxxx, vishal.l.verma@xxxxxxxxx, dave.jiang@xxxxxxxxx, logang@xxxxxxxxxxxx, bhelgaas@xxxxxxxxxx, jack@xxxxxxx, jgg@xxxxxxxx, catalin.marinas@xxxxxxx, will@xxxxxxxxxx, mpe@xxxxxxxxxxxxxx, npiggin@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, ira.weiny@xxxxxxxxx, willy@xxxxxxxxxxxxx, djwong@xxxxxxxxxx, tytso@xxxxxxx, linmiaohe@xxxxxxxxxx, peterx@xxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, nvdimm@xxxxxxxxxxxxxxx, linux-cxl@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxxxxxx, jhubbard@xxxxxxxxxx, hch@xxxxxx, david@xxxxxxxxxxxxx, chenhuacai@xxxxxxxxxx, kernel@xxxxxxxxxx, loongarch@xxxxxxxxxxxxxxx
In-reply-to: <b8b39849e171c120442963d3fd81c49a8f005bf0.1736488799.git-series.apopple@nvidia.com>
Organization: Red Hat
References: <cover.11189864684e31260d1408779fac9db80122047b.1736488799.git-series.apopple@nvidia.com> <b8b39849e171c120442963d3fd81c49a8f005bf0.1736488799.git-series.apopple@nvidia.com>
User-agent: Mozilla Thunderbird

On 10.01.25 07:00, Alistair Popple wrote:

PAGE_MAPPING_DAX_SHARED is the same as PAGE_MAPPING_ANON. This isn't
currently a problem because FS DAX pages are treated
specially. However a future change will make FS DAX pages more like
normal pages, so folio_test_anon() must not return true for a FS DAX
page.


Yes, very nice to see PAGE_MAPPING_DAX_SHARED go!

--
Cheers,

David / dhildenb

References:
- [PATCH v6 00/26] fs/dax: Fix ZONE_DEVICE page reference counts
  - From: Alistair Popple
- [PATCH v6 08/26] fs/dax: Remove PAGE_MAPPING_DAX_SHARED mapping flag
  - From: Alistair Popple

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