[PATCH bpf-next 00/10] Add support arena atomics for RV64

[Daniel Borkmann]

On 8/5/25 8:52 AM, Pu Lehui wrote:
> On 2025/8/5 14:38, Björn Töpel wrote:
>> Pu Lehui <pulehui at huaweicloud.com> writes:
>>
>>> From: Pu Lehui <pulehui at huawei.com>
>>>
>>> patch 1-3 refactor redundant load and store operations.
>>> patch 4-7 add Zacas instructions for cmpxchg.
>>> patch 8 optimizes exception table handling.
>>> patch 9-10 add support arena atomics for RV64.
>>>
>>> Tests `test_progs -t atomic,arena` have passed as shown bellow,
>>> as well as `test_verifier` and `test_bpf.ko` have passed.
>>
>> [...]
>>
>>> Pu Lehui (10):
>>>    riscv, bpf: Extract emit_stx() helper
>>>    riscv, bpf: Extract emit_st() helper
>>>    riscv, bpf: Extract emit_ldx() helper
>>>    riscv: Separate toolchain support dependency from RISCV_ISA_ZACAS
>>>    riscv, bpf: Add rv_ext_enabled macro for runtime detection extentsion
>>>    riscv, bpf: Add Zacas instructions
>>>    riscv, bpf: Optimize cmpxchg insn with Zacas support
>>>    riscv, bpf: Add ex_insn_off and ex_jmp_off for exception table
>>>      handling
>>>    riscv, bpf: Add support arena atomics for RV64
>>>    selftests/bpf: Enable arena atomics tests for RV64
>>>
>>>   arch/riscv/Kconfig                            |   1 -
>>>   arch/riscv/include/asm/cmpxchg.h              |   6 +-
>>>   arch/riscv/kernel/setup.c                     |   1 +
>>>   arch/riscv/net/bpf_jit.h                      |  70 ++-
>>>   arch/riscv/net/bpf_jit_comp64.c               | 516 +++++-------------
>>>   .../selftests/bpf/progs/arena_atomics.c       |   9 +-
>>>   6 files changed, 214 insertions(+), 389 deletions(-)
>>
>> What a nice series! The best kind of changeset -- new feature, less
>> code! Thank you, Lehui! Again, apologies for the horrible SLA. The
>> weather in Sweden was simply Too Good this summer!
> 
> Sounds like a great vacation!

Thanks for working on this! I just took this into bpf-next, please also
make sure to address the small follow-up request from Bjorn.

>> Tested-by: Björn Töpel <bjorn at rivosinc.com> # QEMU only
>> Acked-by: Björn Töpel <bjorn at kernel.org>

Thanks,
Daniel