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.
Test:
=====
Except of Jiaxun's efficient testing on patch 2/4, I also did cross compiling
of this series on mips64, building passed.
History:
=======
v4->v5:
- In v4, Thomas reported that adding <asm-generic/io.h> including into
mips always cause crash on his malta qemu. Finally, Jiaxun stood up to
take over the patch 2/4 and make it work. This patchset collects
Jiaxun's patch v5 and add Arnd's tag. Thanks to Jiaxun.
- Meanwhile, the old patch 4/4 need be adjusted because Jiaxun has done
some removal of duplicated codes in <asm/io.h>.
- Add reviewers' tags from v4.
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 (2):
arch/*/io.h: remove ioremap_uc in some architectures
mips: io: remove duplicated codes
Jiaxun Yang (1):
mips: add <asm-generic/io.h> including
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 | 123 +++++++++++++++----------
arch/mips/include/asm/mmiowb.h | 4 +-
arch/mips/include/asm/smp-ops.h | 2 -
arch/mips/include/asm/smp.h | 4 +-
arch/mips/kernel/setup.c | 1 +
arch/mips/pci/pci-ip27.c | 3 +
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 +
15 files changed, 88 insertions(+), 73 deletions(-)
--
2.41.0
