linux-kernel - Re: [PATCH v6 08/26] fs/dax: Remove PAGE_MAPPING_DAX

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Message-ID: <f696d28c-c3a8-4500-98da-4ddcaa0db41f@redhat.com>
Date: Tue, 14 Jan 2025 15:47:44 +0100
From: David Hildenbrand <david@...hat.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, lina@...hilina.net, zhang.lyra@...il.com,
 gerald.schaefer@...ux.ibm.com, vishal.l.verma@...el.com,
 dave.jiang@...el.com, logang@...tatee.com, bhelgaas@...gle.com,
 jack@...e.cz, jgg@...pe.ca, catalin.marinas@....com, will@...nel.org,
 mpe@...erman.id.au, npiggin@...il.com, dave.hansen@...ux.intel.com,
 ira.weiny@...el.com, willy@...radead.org, djwong@...nel.org, tytso@....edu,
 linmiaohe@...wei.com, peterx@...hat.com, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linuxppc-dev@...ts.ozlabs.org, nvdimm@...ts.linux.dev,
 linux-cxl@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org, jhubbard@...dia.com,
 hch@....de, david@...morbit.com, chenhuacai@...nel.org, kernel@...0n.name,
 loongarch@...ts.linux.dev
Subject: Re: [PATCH v6 08/26] fs/dax: Remove PAGE_MAPPING_DAX_SHARED mapping
 flag

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