samples/bpf: xdpsock: order memory on AArch64
Define u_smp_rmb() and u_smp_wmb() to respective barrier instructions. This ensures the processor will order accesses to queue indices against accesses to queue ring entries. Signed-off-by: NBrian Brooks <brian.brooks@linaro.org> Acked-by: NBjörn Töpel <bjorn.topel@intel.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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