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219c84fe93
commit abded93ec1e9692920fe309f07f40bd1035f2940 upstream. random_get_entropy() returns a cycles_t, not an unsigned long, which is sometimes 64 bits on various 32-bit platforms, including x86. Conversely, jiffies is always unsigned long. This commit fixes things to use cycles_t for fields that use random_get_entropy(), named "cycles", and unsigned long for fields that use jiffies, named "now". It's also good to mix in a cycles_t and a jiffies in the same way for both add_device_randomness and add_timer_randomness, rather than using xor in one case. Finally, we unify the order of these volatile reads, always reading the more precise cycles counter, and then jiffies, so that the cycle counter is as close to the event as possible. Cc: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.