On 02/04/2015 10:08 AM, Mark Salter wrote:

acpi_os_remap() is used to map ACPI tables. These tables may be in ram
which are already included in the kernel's linear RAM mapping. So we
need ioremap_cache to avoid two mappings to the same physical page
having different caching attributes.

Would it be possible to modify ioremap() so that it can tell whether the 
memory is already mapped in some way, and then use a compatible remapping?

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