On Thu, Mar 12, 2009 at 02:01:00PM -0500, Timur Tabi wrote: > Can someone explain CLOCK_TICK_RATE to me? It's defined in > arch/powerpc/include/asm/timex.h as such: > > #define CLOCK_TICK_RATE 1024000 /* Underlying HZ */ > > Every architecture defines this, but some use the better comment > "Underlying frequency of the HZ timer". > > My question is: why is this a constant? Shouldn't it be a variable, > perhaps something that is based on tb_ticks_per_usec?
Looks like legacy crud, originally meant to be the PIT input frequency, that isn't used for much on powerpc. It was probably chosen so as to make HZ == ACTHZ for the supported values of HZ. -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
