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This little patch is a follow-up to: https://lore.kernel.org/bpf/20240507095011.15867-1-jose.marchesi@oracle.com/T/#u The temporary workaround of passing -DBPF_NO_PRESERVE_ACCESS_INDEX when building with GCC triggers a redefinition preprocessor error when building progs/skb_pkt_end.c. This patch adds a guard to avoid redefinition. Signed-off-by: Jose E. Marchesi <jose.marchesi@oracle.com> Cc: david.faust@oracle.com Cc: cupertino.miranda@oracle.com Cc: Eduard Zingerman <eddyz87@gmail.com> Cc: Yonghong Song <yonghong.song@linux.dev> Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20240508110332.17332-1-jose.marchesi@oracle.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>