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Replace skb with skb__nullable as the argument name. The suffix tells bpf verifier through btf that the arg could be NULL and should be checked in tp_btf prog. For now, this is the only nullable argument in tcp tracepoints. Signed-off-by: Philo Lu <lulie@linux.alibaba.com> Acked-by: Jakub Kicinski <kuba@kernel.org> Link: https://lore.kernel.org/r/20240911033719.91468-4-lulie@linux.alibaba.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>