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    SubjectRe: [PATCH 01/04] Adding cipher mode context information to crypto_tfm
    Am Mittwoch, den 09.02.2005, 17:19 -0800 schrieb Andrew Morton:

    > > It must be
    > > possible to process more than 2 mappings in softirq context.
    > Adding a few more fixmap slots wouldn't hurt anyone. But if you want an
    > arbitrarily large number of them then no, we cannot do that.
    > Possibly one could arrange for the pages to not be in highmem at all.

    In the case of the LRW use in dm-crypt only plain- and ciphertext need
    to be accessible through struct page (both are addressed through BIO
    vectors). The LRW tweaks could simply be kmalloced. So instead of
    passing "struct scatterlist *tweaksg" we could just pass a "void

    Some of the hard work on the generic scatterlist walker would be for
    nothing then. :(

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