kernel/timer.c

[Wojciech Kromer]

Anyone knows why tehere is a line:

expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);

in kernel/timer.c sys_nanosleep
It adds additional time tick to expire. If anyone uses small HZ value
(eg 100 which is default for arch-ppc) this causes aditional 10ms delay
when calling nanosleep.


For me ( found by Andrzej Kass)
 it should be:

expire = timespec_to_jiffies(&t) + !(t.tv_sec || t.tv_nsec);
   //^^add extra tick if there is
  // nothing in tv_sec and nothing in tv_nsec


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