linux-kernel - [RFC PATCH 0/8] mm: ioremap: Convert architectures to take GENERIC

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Date:   Wed, 12 Oct 2022 12:09:36 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Baoquan He <bhe@...hat.com>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        akpm@...ux-foundation.org, hch@...radead.org,
        agordeev@...ux.ibm.com, wangkefeng.wang@...wei.com,
        schnelle@...ux.ibm.com, David.Laight@...LAB.COM, shorne@...il.com
Subject: [RFC PATCH 0/8] mm: ioremap: Convert architectures to take GENERIC_IOREMAP way (Alternative)

From: 

As proposed in the discussion related to your series, here comes an
exemple of how it could be.

I have taken it into ARC and IA64 architectures as an exemple. This is
untested, even not compiled, it is just to illustrated my meaning in the
discussion.

I also added a patch for powerpc architecture, that one in tested with
both pmac32_defconfig and ppc64_le_defconfig.

>From my point of view, this different approach provide less churn and
less intellectual disturbance than the way you do it.

Open for discussion.

Baoquan He (5):
  hexagon: mm: Convert to GENERIC_IOREMAP
  openrisc: mm: remove unneeded early ioremap code
  mm: ioremap: allow ARCH to have its own ioremap definition
  arc: mm: Convert to GENERIC_IOREMAP
  ia64: mm: Convert to GENERIC_IOREMAP

Christophe Leroy (3):
  mm/ioremap: Define generic_ioremap_prot() and generic_iounmap()
  mm/ioremap: Consider IOREMAP space in generic ioremap
  powerpc: mm: Convert to GENERIC_IOREMAP

 arch/arc/Kconfig              |  1 +
 arch/arc/include/asm/io.h     |  7 +++---
 arch/arc/mm/ioremap.c         | 46 +++--------------------------------
 arch/hexagon/Kconfig          |  1 +
 arch/hexagon/include/asm/io.h |  9 +++++--
 arch/hexagon/mm/ioremap.c     | 44 ---------------------------------
 arch/ia64/Kconfig             |  1 +
 arch/ia64/include/asm/io.h    | 11 ++++++---
 arch/ia64/mm/ioremap.c        | 45 ++++++----------------------------
 arch/openrisc/mm/ioremap.c    | 22 ++++-------------
 arch/powerpc/Kconfig          |  1 +
 arch/powerpc/include/asm/io.h | 11 ++++++---
 arch/powerpc/mm/ioremap.c     | 26 +-------------------
 arch/powerpc/mm/ioremap_32.c  | 25 ++++++++-----------
 arch/powerpc/mm/ioremap_64.c  | 22 +++++++----------
 include/asm-generic/io.h      |  7 ++++++
 mm/ioremap.c                  | 33 +++++++++++++++++++------
 17 files changed, 98 insertions(+), 214 deletions(-)
 delete mode 100644 arch/hexagon/mm/ioremap.c

-- 
2.37.1