Re: [PATCH 01/04] Adding cipher mode context information tocrypto_tfm

[Andrew Morton]

Fruhwirth Clemens <clemens@xxxxxxxxxxxxx> wrote:
>
> 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.

Taking more than one sleeping kmap at a time within the same process is
deadlocky, btw.  You can end up with N such tasks all holding one kmap and
waiting for someone else to release one.

Possibly one could arrange for the pages to not be in highmem at all.
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