linux-kernel - [PATCH v3 0/2] arch/*/io.h: remove ioremap

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Date:   Fri,  3 Mar 2023 18:28:15 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arch@...r.kernel.org, linux-mm@...ck.org, arnd@...db.de,
        geert@...ux-m68k.org, mcgrof@...nel.org, hch@...radead.org,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH v3 0/2] arch/*/io.h: remove ioremap_uc in some architectures

This patchset tries to remove ioremap_uc() in the current architectures
except of x86 and ia64. They will use the default ioremap_uc definition
in <asm-generic/io.h> which returns NULL. If any arch sees a breakage
caused by the default ioremap_uc(), it can provide a sepcific one for its
own usage. This is done in patch 2.

To get rid of all of them other than x86 and ia64, add asm-generic/io.h
to asm/io.h of mips ARCH. With this adding, we can get rid of the
ioremap_uc() in mips too. Adding asm-generic/io.h is done in patch 1.

v2->v3:
  - In patch 1, move those macro definition of functio near its function 
    declaration according to Arnd's suggestion. And remove the unneeded
    change in asm/mmiowb.h introduced in old version.
  - In patch 2, clean up and rewrite the messy document related to
    ioremap_uc() in Documentation/driver-api/device-io.rst.
v1->v2:
  - Update log of patch 2, and document related to ioremap_uc()
    according to Geert's comment.
  - Add Geert's Acked-by.

Baoquan He (2):
  mips: add <asm-generic/io.h> including
  arch/*/io.h: remove ioremap_uc in some architectures

 Documentation/driver-api/device-io.rst | 14 +++--
 arch/alpha/include/asm/io.h            |  1 -
 arch/hexagon/include/asm/io.h          |  3 -
 arch/m68k/include/asm/kmap.h           |  1 -
 arch/mips/include/asm/io.h             | 79 +++++++++++++++++++++++---
 arch/parisc/include/asm/io.h           |  2 -
 arch/powerpc/include/asm/io.h          |  1 -
 arch/sh/include/asm/io.h               |  2 -
 arch/sparc/include/asm/io_64.h         |  1 -
 9 files changed, 79 insertions(+), 25 deletions(-)

-- 
2.34.1