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Currently kernel kfunc bpf_dynptr_is_rdonly() has prototype ... __bpf_kfunc bool bpf_dynptr_is_rdonly(struct bpf_dynptr_kern *ptr) ... while selftests bpf_kfuncs.h has: extern int bpf_dynptr_is_rdonly(const struct bpf_dynptr *ptr) __ksym; Such a mismatch might cause problems although currently it is okay in selftests. Fix it to prevent future potential surprise. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20230517040409.4024618-1-yhs@fb.com