Re: [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@xxxxxxxxxxxxxxx> writes:
> >
> > > From: Pu Lehui <pulehui@xxxxxxxxxx>
> > >
> > > 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@xxxxxxxxxxxx> # QEMU only
> > Acked-by: Björn Töpel <bjorn@xxxxxxxxxx>

Thanks,
Daniel