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Some hardware RNGs provide a single register for obtaining random data. Instead of signaling when new data is available, the reader must wait a fixed amount of time between reads for new data to be generated. timeriomem_rng implements this scheme with the period specified in platform data or device tree. While the period is specified in microseconds, the implementation used a standard timer which has a minimum delay of 1 jiffie and caused a significant bottleneck for devices that can update at 1us. By switching to an hrtimer, 1us periods now only delay at most 2us per read. Signed-off-by: Rick Altherr <raltherr@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.