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    SubjectRe: [patch] x86, pat: fix reserve_memtype() for legacy 1MB range
    Pavel Machek wrote:
    > On Fri 2009-01-09 14:48:04, Suresh Siddha wrote:
    >> On Fri, Jan 09, 2009 at 02:39:31PM -0800, H. Peter Anvin wrote:
    >>> Suresh Siddha wrote:
    >>>> Here X is trying to map first 8KB of memory using /dev/mem. Existing
    >>>> code treats first 0-4KB of memory as non-RAM and 4KB-8KB as RAM. Recent
    >>>> code changes don't allow to map memory with different attributes
    >>>> at the same time.
    >>>>
    >>> Why was 0-4 KB marked as non-RAM? It is most definitely RAM, and should
    >>> be WB.
    >> While in reality it is RAM, we have CONFIG_STRICT_DEVMEM which doesn't allow
    >> apps to map RAM pages using /dev/mem. And to allow app's to map the
    >> legacy 0-4KB bios data page, we consider it as non-RAM.
    >
    > Fix config_strict_devmem? Ram is ram, and we should not li for
    > strict_devmem benefit...
    >

    *As far as I understand* this is only considered non-RAM for the purpose
    of strict_devmem?

    -hpa

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



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