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authorStephen Rothwell <sfr@canb.auug.org.au>2005-05-25 13:41:26 +1000
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-25 10:13:42 -0700
commit8f80e5c911465743ccd3a328f992c7d8aaebf1e8 (patch)
tree86f5508d38d2f3b2e0f0d5b528fb27edef431b0f
parent2a24ab628aa7b190be32f63dfb6d96f3fb61580a (diff)
[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 <sfr@canb.auug.org.au> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/ppc64/kernel/time.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/time.c b/arch/ppc64/kernel/time.c
index 772a465b49f..3d54745108c 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;