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void __iomem *addr should be const


__iomem *addr seems to lack a const qualifier in the ioread* definitions
from include/asm-generic/iomap.h (other definitions such as
asm-generic/io.h do have the const).

This issue was briefly discussed a while ago[0] but the outcome is not
quite clear to me. Should I submit a patch addressing this issue or is it
a definitive wontfix?

This issue triggers warnings in my current work but I would like to avoid
dropping the const if possible.


[0] https://patchwork.kernel.org/patch/5742881/

                Hugo Lefeuvre (hle)    |    www.owl.eu.com
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