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* [PATCH v4 0/4] arch/*/io.h: remove ioremap_uc in some architectures
@ 2023-03-08 13:07 Baoquan He
  2023-03-08 13:07   ` Baoquan He
                   ` (3 more replies)
  0 siblings, 4 replies; 30+ messages in thread
From: Baoquan He @ 2023-03-08 13:07 UTC (permalink / raw)
  To: linux-kernel
  Cc: linux-arch, linux-mm, arnd, mpe, geert, mcgrof, hch, Baoquan He

This patchset tries to remove ioremap_uc() in the current architectures
except of x86 and ia64. They will use the default ioremap_uc version
in <asm-generic/io.h> which returns NULL. Anyone who wants to add new
invocation of ioremap_uc(), please consider using ioremap() instead or
adding a new ARCH specific ioremap_uc(), or refer to the callsite
in drivers/video/fbdev/aty/atyfb_base.c.

This change won't cuase breakage to the current kernel because in the
only ioremap_uc callsite, an adjustment is made to eliminate impact in
patch 1 of this series. 

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. This is done in patch 2. And a followup patch
4 is added to remove duplicated code according to Arnd's suggestion.

v3->v4:
  - Add patch 1 to adjust code in the only ioremap_uc() callsite so that
    later removing ioremap_uc() won't cause breakage.
  - Update log and document writing in patch 3.
  - Add followup patch 4 to clean up duplicated code in asm/io.h of MIPS.
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.

Arnd Bergmann (1):
  video: fbdev: atyfb: only use ioremap_uc() on i386 and ia64

Baoquan He (3):
  mips: add <asm-generic/io.h> including
  arch/*/io.h: remove ioremap_uc in some architectures
  mips: io: remove duplicated codes

 Documentation/driver-api/device-io.rst |   9 +-
 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             | 112 +++++++++++++++----------
 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 -
 drivers/video/fbdev/aty/atyfb_base.c   |   4 +
 10 files changed, 78 insertions(+), 58 deletions(-)

-- 
2.34.1


^ permalink raw reply	[flat|nested] 30+ messages in thread

end of thread, other threads:[~2023-03-15 13:10 UTC | newest]

Thread overview: 30+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-03-08 13:07 [PATCH v4 0/4] arch/*/io.h: remove ioremap_uc in some architectures Baoquan He
2023-03-08 13:07 ` [PATCH v4 1/4] video: fbdev: atyfb: only use ioremap_uc() on i386 and ia64 Baoquan He
2023-03-08 13:07   ` Baoquan He
2023-03-08 20:01   ` Luis Chamberlain
2023-03-08 20:01     ` Luis Chamberlain
2023-03-08 21:34     ` Arnd Bergmann
2023-03-08 21:34       ` Arnd Bergmann
2023-03-08 21:49       ` Helge Deller
2023-03-08 21:49         ` Helge Deller
2023-03-08 22:48     ` Ondrej Zary
2023-03-08 22:48       ` Ondrej Zary
2023-03-08 13:07 ` [PATCH v4 2/4] mips: add <asm-generic/io.h> including Baoquan He
2023-03-13 17:55   ` Thomas Bogendoerfer
2023-03-14  2:56     ` Baoquan He
2023-03-14 15:34       ` Thomas Bogendoerfer
2023-03-14 16:31         ` Florian Fainelli
2023-03-14 17:19           ` Arnd Bergmann
2023-03-15  0:49             ` Baoquan He
2023-03-15 12:52               ` Thomas Bogendoerfer
2023-03-08 13:07 ` [PATCH v4 3/4] arch/*/io.h: remove ioremap_uc in some architectures Baoquan He
2023-03-08 13:07   ` Baoquan He
2023-03-09 14:36   ` Thomas Bogendoerfer
2023-03-09 14:36     ` Thomas Bogendoerfer
2023-03-10  1:45     ` Baoquan He
2023-03-10  1:45       ` Baoquan He
2023-03-10 21:14       ` Helge Deller
2023-03-10 21:14         ` Helge Deller
2023-03-09 22:54   ` Michael Ellerman
2023-03-09 22:54     ` Michael Ellerman
2023-03-08 13:07 ` [PATCH v4 4/4] mips: io: remove duplicated codes Baoquan He

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