What if I set DISDEFWBUF and using MPU?

Is there any problem if I set DISDEFWBUF in the Auxiliary Control Register with MPU in use ??

According to "Cortex-M4_Software_Developers_Errata_Notice_v3", It said :

For software not using the memory protection unit, this erratum can be worked around by setting DISDEFWBUF in the
Auxiliary Control Register.

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