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

[Andrew Morton]

Fruhwirth Clemens <clemens@xxxxxxxxxxxxx> wrote:
>
> First, one has to make kmap fallible.

I think it would be relatively simple and sane to modify the existing
kmap() implementations to add a new try_kmap() which is atomic and returns
failure if it would have needed to sleep.

That being said, kmap() is a sort of old and deprecated thing which scales
badly on SMP.  We've put considerable work into moving over to
kmap_atomic() and using nice tight short code regions where atomic
kmappings are held.

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