Re: [PATCH bpf v2] bpf: fix BPF_F_CPU validation for sparse CPU IDs

Hello:

This patch was applied to bpf/bpf.git (master)
by Andrii Nakryiko <[email protected]>:

On Fri, 14 Aug 2026 00:09:00 +0800 you wrote:
> BPF_F_CPU stores the target CPU ID in the upper 32 bits of the map
> operation flags. bpf_map_check_op_flags() currently compares that ID
> with num_possible_cpus(), which is the number of possible CPUs rather
> than a bound on CPU IDs.
> 
> On an arm64 QEMU guest with a CPU device-tree hole, the possible CPU
> mask was 0,2-3. A userspace program using raw bpf() syscalls creates
> a BPF_MAP_TYPE_PERCPU_ARRAY and performs update and lookup operations
> for each CPU by setting BPF_F_CPU and the CPU ID in the flags.
> 
> [...]

Here is the summary with links:
  - [bpf,v2] bpf: fix BPF_F_CPU validation for sparse CPU IDs
    https://git.kernel.org/bpf/bpf/c/ed54bf564ac5

You are awesome, thank you!
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