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    SubjectRe: Missing cache flush.
    >  - it is buggy and will lock up some CPU's. Use with EXTREME CAUTION.
    > Intel set a special field in the MP table for whether wbinval is
    > usable or not, and you can probably find their errata on which CPU's
    > it doesn't work on (I think it was some early PPro steppings).

    Also some intel chipsets it didnt work with (notably earlier PCI ones) - indeed
    that seems to be the cause of the 'bzImage wont boot on XYZ 486 tosh
    laptop' bug.

    > On the whole, I would suggest avoiding this like the plague, and just
    > marking such memory to be non-cacheable, regardless of whether there is
    > a performance impact or not. If you mark it write-combining and
    > speculative, it's going to perform a bit better.

    Or memcpy the blocks into the block or page cache when you need them.

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