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    SubjectRe: [PATCH] ACPI: use ioremap_cache()
    On 12/27/2010 07:21 PM, Shaohua Li wrote:
    > RCRB is a memory mapped io. In ICH, it's chipset configuration
    > registers. this range can't be cached.
    > I thought we should add a check like
    > if page is E820_RAM or E820_ACPI then
    > cached_map
    > else
    > uncached_map
    > we have page_is_ram() API which just checks E820_RAM, I thought we can
    > add a new API to check E820_ACPI.

    For x86, that is handled by the MTRRs; for ia64, I would assume
    ioremap() handles that somehow, otherwise it wouldn't be able to handle
    existing drivers with ioremap() in them.


    H. Peter Anvin, Intel Open Source Technology Center
    I work for Intel. I don't speak on their behalf.

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