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authorViresh Kumar <viresh.kumar@linaro.org>2014-06-22 01:29:13 +0200
committerThomas Gleixner <tglx@linutronix.de>2014-06-23 11:23:46 +0200
commitd6f93829811a3e74f58e3c3823d507411eed651a (patch)
tree6d3cdb7860e404424eb4bb60602f66fe7e8c696d /kernel/time/timer.c
parent5cee964597260237dd2cabb3ec22bba0da24b25d (diff)
downloadlinux-sh-d6f93829811a3e74f58e3c3823d507411eed651a.tar.gz
timer: Store cpu-number in struct tvec_base
Timers are serviced by the tick. But when a timer is enqueued on a dynticks target, we need to kick it in order to make it reconsider the next tick to schedule to correctly handle the timer's expiring time. Now while this kick is correctly performed for add_timer_on(), the mod_timer*() family has been a bit neglected. To prepare for fixing this, we need internal_add_timer() to be able to resolve the CPU target associated to a timer's object 'base' so that the kick can be centralized there. This can't be passed as an argument as not all the callers know the CPU number of a timer's base. So lets store it in the struct tvec_base to resolve the CPU without much overhead. It is set once for good at every CPU's first boot. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/1403393357-2070-2-git-send-email-fweisbec@gmail.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time/timer.c')
-rw-r--r--kernel/time/timer.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 3bb01a323b2a..9e5f4f25dcc0 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -82,6 +82,7 @@ struct tvec_base {
unsigned long next_timer;
unsigned long active_timers;
unsigned long all_timers;
+ int cpu;
struct tvec_root tv1;
struct tvec tv2;
struct tvec tv3;
@@ -1568,6 +1569,7 @@ static int init_timers_cpu(int cpu)
}
spin_lock_init(&base->lock);
tvec_base_done[cpu] = 1;
+ base->cpu = cpu;
} else {
base = per_cpu(tvec_bases, cpu);
}