linux-kernel - Re: [PATCH v6 24/26] mm: Remove devmap related functions and page table bits

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Message-ID: <6786b5042faaf_20f329461@dwillia2-xfh.jf.intel.com.notmuch>
Date: Tue, 14 Jan 2025 11:03:32 -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>,
	<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>, <david@...hat.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 24/26] mm: Remove devmap related functions and page
 table bits

Alistair Popple wrote:
> Now that DAX and all other reference counts to ZONE_DEVICE pages are
> managed normally there is no need for the special devmap PTE/PMD/PUD
> page table bits. So drop all references to these, freeing up a
> software defined page table bit on architectures supporting it.
> 
> Signed-off-by: Alistair Popple <apopple@...dia.com>
> Acked-by: Will Deacon <will@...nel.org> # arm64

Hooray! Looks good to me modulo breaking up the previous patch.

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