* Missing get_cycles() has effect on quality of entropy
@ 2013-09-09 9:27 Thorsten Glaser
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From: Thorsten Glaser @ 2013-09-09 9:27 UTC (permalink / raw)
To: linux-m68k
Hi!
https://lists.openwrt.org/pipermail/openwrt-devel/2013-September/021318.html
affects several architectures – m68k among them.
Some arches have comments like “only used by the scheduler”. This may
have been once true, but a quick “git grep -w get_cycles” shows much
more use throughout the Linux kernel.
The random thing is scary already, but…
mm/slub.c: p += 64 + (get_cycles() & 0xff) * sizeof(void *);
… there are several cases like this, where an always-zero get_cycles()
result severely impacts operation of the code.
So I ask whether it’s possible to fill this code with life, for at
least a subset of all architectures?
bye,
//mirabilos
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