From 23cb8c297eb939b25e5a628dc9e8a71b17f1c44e Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt <benh@kernel.crashing.org> Date: Wed, 5 Oct 2005 17:43:40 +1000 Subject: [PATCH] [PATCH] ppc: Fix timekeeping with HZ=250 on some Mac models Older Macs which uses the VIA chip timers to calibrate the timebase used some code that wouldn't work if HZ wasn't divisible by 100... This fixes it at least for 250. Not totally perfect but should be enough for now (so it at least works with the default value which is now 250). There is still a potential issue with the core using CLOCK_TICK_RATE to maintain xtime and CLOCK_TICK_RATE value on ppc32 is pure crap, but that is a different problem, this patch at least brings us back to our previous situation. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> --- arch/ppc/platforms/pmac_time.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/ppc/platforms/pmac_time.c b/arch/ppc/platforms/pmac_time.c index 778ce4fec368..efb819f9490d 100644 --- a/arch/ppc/platforms/pmac_time.c +++ b/arch/ppc/platforms/pmac_time.c @@ -195,7 +195,7 @@ via_calibrate_decr(void) ; dend = get_dec(); - tb_ticks_per_jiffy = (dstart - dend) / (6 * (HZ/100)); + tb_ticks_per_jiffy = (dstart - dend) / ((6 * HZ)/100); tb_to_us = mulhwu_scale_factor(dstart - dend, 60000); printk(KERN_INFO "via_calibrate_decr: ticks per jiffy = %u (%u ticks)\n",