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Jason A. Donenfeld
829d680e82
Currently the jitter mechanism will require two timer ticks per
iteration, and it requires N iterations per bit. This N is determined
with a small measurement, and if it's too big, it won't waste time with
jitter entropy because it'd take too long or not have sufficient entropy
anyway.
With the current max N of 32, there are large timeouts on systems with a
small CONFIG_HZ. Rather than set that maximum to 32, instead choose a
factor of CONFIG_HZ. In this case, 1/30 seems to yield sane values for
different configurations of CONFIG_HZ.
Reported-by: Vladimir Murzin <[email protected]>
Fixes: 78c768e619 ("random: vary jitter iterations based on cycle counter speed")
Signed-off-by: Jason A. Donenfeld <[email protected]>
Tested-by: Vladimir Murzin <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>