[PATCH v2 0/4] Consolidate IO memcpy functions

[Julian Vetter]

Thank you for your feedback Arnd. In regards to the filename, etc. I
went with the first route and created a new file called io_copy.c.
Although, I'm not sure if it's a good idea to create yet another file
that serves a limited purpose. But I'm a bit afraid to add the
functions to iomap_copy.c because there is no common consus in the
architecture code about memcpy_{from,to}io. Some specify it with
_memcpy_xx, some directly with memcpy_xx, and another bunch uses
__memcpy_xx. So, if we want to merge it with iomap_copy.c, I would need
to export the __memcpy_xx symbols for all architectures that don't want
to use the "generic" memcpy_xx functions for now or rename their given
implementation to __memcpy_xx, right? But if you think it's better to
merge the two, I will have another look and modify the code for all
remaining architectures as well.

Signed-off-by: Julian Vetter <jvetter@xxxxxxxxxxxxx>

---
Changes for v2:
- Renamed io.c -> io_copy.c
- Updated flag to 'GENERIC_IO_COPY'
- Replaced pointer dereferences by 'put_unaligned()'/'get_unaligned()'
- Replaced '#ifdef CONFIG_64BIT' by 'if(IS_ENABLED(CONFIG_64BIT))'
- Removed '__raw_{read,write}_native' and replaced by
  'if(IS_ENABLED(CONFIG_64BIT))' -> '__raw_write{l,q}'
---
Julian Vetter (4):
  Consolidate __memcpy_{to,from}io and __memset_io into a single lib
  Use generic io memcpy functions on the arm64 architecture
  Use generic io memcpy functions on the csky architecture
  Use generic io memcpy functions on the loongarch architecture

 arch/arm64/Kconfig             |   1 +
 arch/arm64/kernel/io.c         |  87 ---------------------------
 arch/csky/Kconfig              |   1 +
 arch/csky/kernel/Makefile      |   2 +-
 arch/csky/kernel/io.c          |  91 ----------------------------
 arch/loongarch/Kconfig         |   1 +
 arch/loongarch/kernel/Makefile |   2 +-
 arch/loongarch/kernel/io.c     |  94 -----------------------------
 lib/Kconfig                    |   3 +
 lib/Makefile                   |   1 +
 lib/io_copy.c                  | 107 +++++++++++++++++++++++++++++++++
 11 files changed, 116 insertions(+), 274 deletions(-)
 delete mode 100644 arch/csky/kernel/io.c
 delete mode 100644 arch/loongarch/kernel/io.c
 create mode 100644 lib/io_copy.c

-- 
2.34.1