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GCC emits a warning: progs/test_tcpbpf_kern.c:60:9: error: ‘op’ is used uninitialized [-Werror=uninitialized] when an uninialized op is used with a "+r" constraint. The + modifier means a read-write operand, but that operand in the selftest is just written to. This patch changes the selftest to use a "=r" constraint. This pacifies GCC. Tested in bpf-next master. No regressions. Signed-off-by: Jose E. Marchesi <jose.marchesi@oracle.com> Cc: Yonghong Song <yhs@meta.com> Cc: Eduard Zingerman <eddyz87@gmail.com> Cc: david.faust@oracle.com Cc: cupertino.miranda@oracle.com Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20240123205624.14746-1-jose.marchesi@oracle.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>