linux-kernel - Re: [PATCH] mm: remove io-mapping

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Message-ID: <87y0sd8lpv.fsf@trenco.lwn.net>
Date: Thu, 24 Jul 2025 12:53:00 -0600
From: Jonathan Corbet <corbet@....net>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Andrew Morton
 <akpm@...ux-foundation.org>
Cc: Christoph Hellwig <hch@...radead.org>, David Hildenbrand
 <david@...hat.com>, "Liam R . Howlett" <Liam.Howlett@...cle.com>,
 Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>, Suren
 Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: remove io-mapping

Lorenzo Stoakes <lorenzo.stoakes@...cle.com> writes:

> This is dead code, which was used from commit b739f125e4eb ("i915: use
> io_mapping_map_user") but reverted a month later by commit
> 0e4fe0c9f2f9 ("Revert "i915: use io_mapping_map_user"") back in 2021.
>
> Since then nobody has used it, so remove it.
>
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> ---
>  include/linux/io-mapping.h | 231 -------------------------------------
>  mm/Kconfig                 |   4 -
>  mm/Makefile                |   1 -
>  mm/io-mapping.c            |  30 -----
>  4 files changed, 266 deletions(-)
>  delete mode 100644 include/linux/io-mapping.h
>  delete mode 100644 mm/io-mapping.c

[...]

> -/*
> - * The io_mapping mechanism provides an abstraction for mapping
> - * individual pages from an io device to the CPU in an efficient fashion.
> - *
> - * See Documentation/driver-api/io-mapping.rst
> - */
				      ^
				      |
You'll want to get rid of that file --+ too

jon