> If you need to introduce this constraint, then you will need to audit the users > of !CRYPTO_ALG_ALLOCATES_MEMORY to verify that none of them are issuing requests > that violate this constraint, then add this to the documentation comment for > CRYPTO_ALG_ALLOCATES_MEMORY. Makes sense. I see that the only users of !CRYPTO_ALG_ALLOCATES_MEMORY are dm-crypt and dm-integrity but I haven't done an audit on those yet to understand if they use more than 4 entries. Regards, [1] https://lore.kernel.org/linux-crypto/20200722072932.GA27544@xxxxxxxxxxxxxxxxxxx/ -- Giovanni
