Re: [PATCH bpf-next v3 1/6] bpf: Derive the atomic load register in one place

Hello:

This series was applied to bpf/bpf-next.git (master)
by Eduard Zingerman <[email protected]>:

On Tue, 11 Aug 2026 15:15:55 +0200 you wrote:
> check_atomic_rmw() open codes the mapping from a BPF_ATOMIC to the register
> it reads the old value into, the BPF_STX case of insn_def_regno() open codes
> the very same mapping a second time, the const folding and the liveness
> transfer functions a third and a fourth time, and BPF JITs need it as well
> to know which register a faulting BPF_PROBE_ATOMIC has to clear.
> 
> Add a small helper so that all of them can share it. No functional change.
> The BPF_LOAD_ACQ case is there for the JITs, which do walk all instruction
> classes. const_reg_xfer() loses its explicit BPF_ATOMIC mode test since the
> helper checks class and mode itself; the BPF_PROBE_ATOMIC it additionally
> accepts cannot be seen there as it is only set from bpf_do_misc_fixups(),
> that is, after const folding has run. arg_track_xfer() keeps its mode test
> since that also guards the stack clearing next to it.
> 
> [...]

Here is the summary with links:
  - [bpf-next,v3,1/6] bpf: Derive the atomic load register in one place
    https://git.kernel.org/bpf/bpf-next/c/41c5dbb4be3c
  - [bpf-next,v3,2/6] bpf, riscv: Clear fetch destination on faulting arena atomic
    https://git.kernel.org/bpf/bpf-next/c/1519f488e8ce
  - [bpf-next,v3,3/6] bpf, x86: Clear fetch destination on faulting arena atomic
    https://git.kernel.org/bpf/bpf-next/c/cf92a108601a
  - [bpf-next,v3,4/6] bpf, arm64: Clear fetch destination on faulting arena atomic
    https://git.kernel.org/bpf/bpf-next/c/ea3f20cb5918
  - [bpf-next,v3,5/6] bpf, s390: Clear fetch destination on faulting arena atomic
    https://git.kernel.org/bpf/bpf-next/c/cc3e12330599
  - [bpf-next,v3,6/6] selftests/bpf: Add arena fault tests for atomics with fetch
    https://git.kernel.org/bpf/bpf-next/c/611a9f0d3dca

You are awesome, thank you!
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