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Replace the verifier test for default trusted pointer semantics, which previously relied on BPF kfunc bpf_get_root_mem_cgroup(), with a new test utilizing dedicated BPF kfuncs defined within the bpf_testmod. bpf_get_root_mem_cgroup() was modified such that it again relies on KF_ACQUIRE semantics, therefore no longer making it a suitable candidate to test BPF verifier default trusted pointer semantics against. Link: https://lore.kernel.org/bpf/20260113083949.2502978-2-mattbobrowski@google.com Signed-off-by: Matt Bobrowski <mattbobrowski@google.com> Link: https://lore.kernel.org/r/20260120091630.3420452-1-mattbobrowski@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>