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LLVM23 ([1]) supports 'true' function signature in BTF. The return type of the caller of a tailcall must be an 'int'. Otherwise, verification will fail (see check_btf_func() in check_btf.c). So with llvm23, it is possible that the compiler may change the caller's return type from 'int' to 'void'. To prevent this, barrier_var() and __sink() are used to avoid returning a constant prone to be optimized. [1] https://github.com/llvm/llvm-project/pull/198426 Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20260609233407.2711577-1-yonghong.song@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>