I found this lost series developed by Guo so here is a respin with the
comments on v2 applied.

This patch series adds Zicbop support and then enables the Linux
prefetch features.

Changelog:
V3:
 - Fix typo (Drew)
 - Split first patch (Drew)
 - Ensure that the bits [0:4] of the prefetch insns are zeroed
 - Move PREFETCHW_ASM out of ifdef (Guo)
 - Remove CBO_ prefix for prefetching insn
 - Add prefetch (Drew)

V2: https://lore.kernel.org/linux-riscv/20231231082955.16516-1-guoren@kernel.org/
 - Separate from the qspinlock series
 - Optimize coding convention with last review advice
 - Add DEFINE_INSN_S type in insn-def.h
 - Add CBO_PREFETCH_I/R/W

V1:
https://lore.kernel.org/linux-riscv/20230910082911.3378782-4-guoren@kernel.org/

Alexandre Ghiti (2):
  riscv: Introduce Zicbop instructions
  riscv: Add support for Zicbop

Guo Ren (2):
  riscv: Add ARCH_HAS_PREFETCH[W] support with Zicbop
  riscv: xchg: Prefetch the destination word for sc.w

 arch/riscv/Kconfig                  | 15 +++++++
 arch/riscv/include/asm/barrier.h    |  5 ---
 arch/riscv/include/asm/cacheflush.h |  1 +
 arch/riscv/include/asm/cmpxchg.h    |  4 +-
 arch/riscv/include/asm/hwcap.h      |  1 +
 arch/riscv/include/asm/insn-def.h   | 66 +++++++++++++++++++++++++++++
 arch/riscv/include/asm/processor.h  | 25 ++++++++++-
 arch/riscv/kernel/cpufeature.c      | 21 +++++++++
 arch/riscv/mm/cacheflush.c          | 14 ++++--
 9 files changed, 142 insertions(+), 10 deletions(-)

-- 
2.39.2

> Alexandre Ghiti (2):
>   riscv: Introduce Zicbop instructions
>   riscv: Add support for Zicbop
> 
> Guo Ren (2):
>   riscv: Add ARCH_HAS_PREFETCH[W] support with Zicbop
>   riscv: xchg: Prefetch the destination word for sc.w

For this series,

Tested-by: Andrea Parri <parri.andrea@gmail.com>

  Andrea