From 8f80e5c911465743ccd3a328f992c7d8aaebf1e8 Mon Sep 17 00:00:00 2001 From: Stephen Rothwell Date: Wed, 25 May 2005 13:41:26 +1000 Subject: [PATCH] [PATCH] ppc64: fix initialisation of gettimeofday calculations On PPC64, we keep track of when we need to update jiffies (and the variables used to calculate the time of day) based on the time base. If the time base frequence is sufficiently high compared to the processor clock frequency, then it is possible for the time of day variables to be corrupted at the time of the first decrementer interrupt we take. This became obvious on a legacy iSeries where the time base frequency is the same as the processor clock. This one line patch fixes the initialisation so that the time of day variables and the indicator we use to tell when updates are due are better synchronised. Signed-off-by: Stephen Rothwell Signed-off-by: Linus Torvalds --- arch/ppc64/kernel/time.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/ppc64/kernel/time.c b/arch/ppc64/kernel/time.c index 772a465b49f9..3d54745108c7 100644 --- a/arch/ppc64/kernel/time.c +++ b/arch/ppc64/kernel/time.c @@ -515,6 +515,7 @@ void __init time_init(void) do_gtod.varp = &do_gtod.vars[0]; do_gtod.var_idx = 0; do_gtod.varp->tb_orig_stamp = tb_last_stamp; + get_paca()->next_jiffy_update_tb = tb_last_stamp + tb_ticks_per_jiffy; do_gtod.varp->stamp_xsec = xtime.tv_sec * XSEC_PER_SEC; do_gtod.tb_ticks_per_sec = tb_ticks_per_sec; do_gtod.varp->tb_to_xs = tb_to_xs; -- GitLab