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Currently, we only allocate a structure to hold metadata if we need to allocate an ioremap for every access, such as on x86-32. However, it would be useful to store basic information about the io-mapping, such as its page protection, on all platforms. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: linux-mm@kvack.org Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20160819155428.1670-4-chris@chris-wilson.co.uk