[PATCH v3 0/2] arch/riscv: Add bitrev.h file to support rev8 and brev8

From: Jinjie Ruan

Date: Fri Apr 17 2026 - 05:46:20 EST


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 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 (2):
bitops: Define generic __bitrev8/16/32 for reuse
arch/riscv: Add bitrev.h file to support rev8 and brev8

arch/riscv/Kconfig | 1 +
arch/riscv/include/asm/bitrev.h | 55 +++++++++++++++++++++++++++
include/asm-generic/bitops/__bitrev.h | 22 +++++++++++
include/linux/bitrev.h | 20 ++--------
lib/bitrev.c | 3 --
5 files changed, 82 insertions(+), 19 deletions(-)
create mode 100644 arch/riscv/include/asm/bitrev.h
create mode 100644 include/asm-generic/bitops/__bitrev.h

--
2.34.1