Re: cryptoapi highmem bug

[Andrew Morton]

Jean-Luc Cooke <jlcooke@xxxxxxxxxxxxxx> wrote:
>
> How do I check for equal real addresses from two virtual ones?

I don't think there is a practical way of doing this.  It would involve
comparing the virtual address with the kmap and atomic kmap regions,
performing a pagetable walk, extracting the pageframe.  If the page is not
in a kmap area generate the pageframe directly.  Make that work on all
architectures.  Very yuk.

If practical this API should have been defined in terms of
(page/offset/len) and it should have kmapped the pages itself.  I guess
it's too late for that.

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