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There are two definitions conflicting each other, for more details, refer to [1]. include/rte_atomic_64.h:19: error: "dmb" redefined [-Werror] drivers/bus/fslmc/mc/fsl_mc_sys.h:36: note: this is the location of the previous definition #define dmb() {__asm__ __volatile__("" : : : "memory"); } The fix is to reuse the EAL definition to avoid conflicts. [1] http://inbox.dpdk.org/users/VI1PR08MB537631AB25F41B8880DCCA988FDF0@ VI1PR08MB5376.eurprd08.prod.outlook.com/T/#u Fixes: 3af733ba8da8 ("bus/fslmc: introduce MC object functions") Cc: stable@dpdk.org Signed-off-by: Gavin Hu <gavin.hu@arm.com> Reviewed-by: Phil Yang <phil.yang@arm.com> Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>