This series is a resend for Jinjie Ruan's "arch/riscv: Add bitrev.h file
to support rev8 and brev8" [1], my follow-up "lib: compile generic
bitrev based on GENERIC_BITREVERSE" [2], and the fix for a build error
reported by Nathan Chancellor [3].

No changes, except for combining pieces together and rebasing on top of
the tree.

[1] https://lore.kernel.org/all/20260421130752.607500-1-ruanjinjie@huawei.com/
[2] https://lore.kernel.org/all/20260427205210.397471-1-ynorov@nvidia.com/
[3] https://lore.kernel.org/all/20260429202922.GA3575295@ax162/

Build-tested against x86 tinyconfig and defconfig, having disabled and
enabiled CRC32 and BITREVERSE, correspondingly.

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

Yury Norov (3):
  lib: include crc32.h conditionally on CONFIG_CRC32
  lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE
  MAINTAINERS: BITOPS: include bitrev.[ch]

 MAINTAINERS                           |  2 ++
 arch/riscv/Kconfig                    |  2 ++
 arch/riscv/include/asm/bitrev.h       | 51 +++++++++++++++++++++++++++
 include/asm-generic/bitops/__bitrev.h | 25 +++++++++++++
 include/linux/bitrev.h                | 20 +++--------
 include/linux/etherdevice.h           |  4 +++
 lib/Kconfig                           | 18 ++++++++++
 lib/Makefile                          |  2 +-
 lib/bitrev.c                          |  3 --
 9 files changed, 107 insertions(+), 20 deletions(-)
 create mode 100644 arch/riscv/include/asm/bitrev.h
 create mode 100644 include/asm-generic/bitops/__bitrev.h

-- 
2.51.0

On Thu, Apr 30, 2026 at 05:13:44PM -0400, Yury Norov wrote:
> This series is a resend for Jinjie Ruan's "arch/riscv: Add bitrev.h file
> to support rev8 and brev8" [1], my follow-up "lib: compile generic
> bitrev based on GENERIC_BITREVERSE" [2], and the fix for a build error
> reported by Nathan Chancellor [3].
> 
> No changes, except for combining pieces together and rebasing on top of
> the tree.
> 
> [1] https://lore.kernel.org/all/20260421130752.607500-1-ruanjinjie@huawei.com/
> [2] https://lore.kernel.org/all/20260427205210.397471-1-ynorov@nvidia.com/
> [3] https://lore.kernel.org/all/20260429202922.GA3575295@ax162/
> 
> Build-tested against x86 tinyconfig and defconfig, having disabled and
> enabiled CRC32 and BITREVERSE, correspondingly.

I've got a feedback from sashiko bot.

1. We need to do #if IS_DEFINED(CONFIG_CRC32) instead of #ifdef,
   because it may be a module.
2. Selecting GENERIC_BITREVERSE without BITREVERSE causes the unmet
   direct dependency warning:

   WARNING: unmet direct dependencies detected for GENERIC_BITREVERSE
  Depends on [n]: BITREVERSE [=n]
  Selected by [m]:
  - MYCONFIG [=m]

I'll send a v2 to fix it

Thanks,
Yury