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To guarantee the orderings of successive stores to CIO and MMIO memory, a lighter weight rte_io_wmb [1] can be used instead of rte_wmb, and since the ICE_PCI_REG_WRITE API already has an inclusive rte_io_wmb, this explicit call can even be saved. [1] http://git.dpdk.org/dpdk/tree/lib/librte_eal/common/include/generic/ rte_atomic.h#n98 Signed-off-by: Gavin Hu <gavin.hu@arm.com> Acked-by: Qi Zhang <qi.z.zhang@intel.com>