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SubjectWhat is the significance of coherent_dma_mask?
Hi,

Some of the USB drivers are setting coherent_dma_mask & many others are
not doing it.
From the description present in the comment beside this field in
device.h, I could not understand its real significance.

Can some one plz let me know its real need and use case where it is
mandatory to use it?

Thanks,
Venu




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