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To support the extended BPF syscall introduced in the previous commit, introduce the following internal APIs: * 'sys_bpf_ext()' * 'sys_bpf_ext_fd()' They wrap the raw 'syscall()' interface to support passing extended attributes. * 'probe_sys_bpf_ext()' Check whether current kernel supports the BPF syscall common attributes. Acked-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Leon Hwang <leon.hwang@linux.dev> Link: https://lore.kernel.org/r/20260512153157.28382-3-leon.hwang@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>