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This adds request chaining and virtual address support to the acomp interface. It is identical to the ahash interface, except that a new flag CRYPTO_ACOMP_REQ_NONDMA has been added to indicate that the virtual addresses are not suitable for DMA. This is because all existing and potential acomp users can provide memory that is suitable for DMA so there is no need for a fall-back copy path. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>