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The ChaCha20-Poly1305 library code uses the sg_miter API to process input presented via scatterlists, except for the special case where the digest buffer is not covered entirely by the same scatterlist entry as the last byte of input. In that case, it uses scatterwalk_map_and_copy() to access the memory in the input scatterlist where the digest is stored. This results in a dependency on crypto/scatterwalk.c and therefore on CONFIG_CRYPTO_ALGAPI, which is unnecessary, as the sg_miter API already provides this functionality via sg_copy_to_buffer(). So use that instead, and drop the dependencies on CONFIG_CRYPTO_ALGAPI and CONFIG_CRYPTO. Reported-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Eric Biggers <ebiggers@kernel.org> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.