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If a hwrng source does not provide an entropy estimate, it currently does not contribute at all to the CRNG. In order to help fix this, in case add_hwgenerator_randomness() is called with the entropy parameter set to zero, go to sleep until one reseed interval has passed. While the hwrng thread currently only runs under conditions where this is non-zero, this change is not harmful and prepares for future updates to the hwrng core. Cc: Herbert Xu <herbert@gondor.apana.org.au> Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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 Restructured Text 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.