Re: [PATCH bpf] bpftool: Fix regression of "bpftool cgroup tree" EINVAL on older kernels

[patchwork-bot+netdevbpf@kernel.org]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Mon, 28 Apr 2025 21:15:36 +0000 you wrote:
> If cgroup_has_attached_progs queries an attach type not supported
> by the running kernel, due to the kernel being older than the bpftool
> build, it would encounter an -EINVAL from BPF_PROG_QUERY syscall.
> 
> Prior to commit 98b303c9bf05 ("bpftool: Query only cgroup-related
> attach types"), this EINVAL would be ignored by the function, allowing
> the function to only consider supported attach types. The commit
> changed so that, instead of querying all attach types, only attach
> types from the array `cgroup_attach_types` is queried. The assumption
> is that because these are only cgroup attach types, they should all
> be supported. Unfortunately this assumption may be false when the
> kernel is older than the bpftool build, where the attach types queried
> by bpftool is not yet implemented in the kernel. This would result in
> errors such as:
> 
> [...]

Here is the summary with links:
  - [bpf] bpftool: Fix regression of "bpftool cgroup tree" EINVAL on older kernels
    https://git.kernel.org/bpf/bpf-next/c/43745d11bfd9

You are awesome, thank you!
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