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I was playing with nanosleep() and SCHED_FIFO, precisely with 500ns 
delays on a P100. As I suspected some problem I inspected the code.

nanosleep() calls udelay() which in turn only has 1 microsecond

Therefore I tried to find udelay(). Was a bit tricky as it's in a
include file. Well I saw that udelay uses delay() in turn, and that
uses loops_per_sec. All old news you'd say, so far.

Then I wondered who sets loops_per_sec, and I found out that a _lot_
of code uses loops_per_sec directly to call delay(). As I think
udelay() is rather new in Linux, I'd suggest to modify the obsolete
code to use udelay() (unless a delay shorter than 1 microsecond is

P.S. Sorry, no patch...

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