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On clang 20.1.8 the XDP program fails to load with a register spill error. Since hdr_len is a __u32, the compiler decided it only needed the lower 32-bits of ctx->data, which later triggers the register spill verifier error. Suggested-by: Martin KaFai Lau <martin.lau@kernel.org> Signed-off-by: Dimitri Daskalakis <dimitri.daskalakis1@gmail.com> Link: https://patch.msgid.link/20251113043102.4062150-1-dimitri.daskalakis1@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>