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