[PATCH v5 0/3] arch/riscv: Add bitrev.h file to support rev8 and brev8

[Jinjie Ruan]

Add bitrev.h file to support rev8 and brev8 for riscv.

Tested functionally on riscv64 QEMU with:
	"-M virt,acpi=on,zbkb=true,zbb=true"

Changes in v5:
- Rename NEED_BYTE_REV_TABLE to GENERIC_BITREVERSE.
- Add help text and make GENERIC_BITREVERSE depends on BITREVERSE, and
  use def_bool.
- Split into three patches.
- Add suggested-by.

Changes in v4:
- Update the riscv implementation as David suggested.
- Add new config called NEED_BYTE_REV_TABLE as David suggested to avoid
  bloating the .data section for architectures that have full hardware
  bit-reverse support and don't need the table.

Changes in v3:
- Fix the build issue by remving the CONFIG_HAVE_ARCH_BITREVERSE macro
  for byte_rev_table.
- Update the riscv implementation as David suggested.
- Add Reviwed-by.

Changes in v2:
- Define generic __bitrev8/16/32 for reuse in riscv.

Jinjie Ruan (3):
  lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig
  bitops: Define generic __bitrev8/16/32 for reuse
  arch/riscv: Add bitrev.h file to support rev8 and brev8

 arch/riscv/Kconfig                    |  2 ++
 arch/riscv/include/asm/bitrev.h       | 51 +++++++++++++++++++++++++++
 include/asm-generic/bitops/__bitrev.h | 25 +++++++++++++
 include/linux/bitrev.h                | 20 +++--------
 lib/Kconfig                           | 18 ++++++++++
 lib/bitrev.c                          |  4 +--
 6 files changed, 102 insertions(+), 18 deletions(-)
 create mode 100644 arch/riscv/include/asm/bitrev.h
 create mode 100644 include/asm-generic/bitops/__bitrev.h

-- 
2.34.1