On Fri, 2007-08-03 at 20:47 +0400, Sergei Shtylyov wrote: > Josh Boyer wrote: > > > Allow generic_calibrate_decr to work for 40x platforms. Given that the > > hardware > > behavior is identical, this also changes the set_dec function to reload the > > PIT > > on 40x to match the behavior 44x currently has. > > Why bother doing this?! This will only warrant you imprecise decrementer > interrupts while it should be interrupting at the precise period currently > (if > you load PIT once)...
Because that's what the kernel timekeeping code expects ? The reference time is the timebase and it doesn't drift. The DEC/PIT is commonly used to trigger any timing, such as what is done for lost interrupts on some platforms. Also, with dynticks, we'll most certainly want variable reload values as well. So I'm very happy to have Josh change the code that way. It makes things more consistent accross the board and removes confusion. Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
