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hrtimer: Store cpu-number in struct hrtimer_cpu_base 

commit cddd02489f52ccf635ed65931214729a23b93cd6 upstream.

In lowres mode, hrtimers are serviced by the tick instead of a clock
event. Now it works well as long as the tick stays periodic but we
must also make sure that the hrtimers are serviced in dynticks mode.

Part of that job consist in kicking a dynticks hrtimer target in order
to make it reconsider the next tick to schedule to correctly handle the
hrtimer's expiring time. And that part isn't handled by the hrtimers
subsystem.

To prepare for fixing this, we need __hrtimer_start_range_ns() to be
able to resolve the CPU target associated to a hrtimer's object
'cpu_base' so that the kick can be centralized there.

So lets store it in the 'struct hrtimer_cpu_base' to resolve the CPU
without overhead. It is set once at CPU's online notification.

Change-Id: I8e1869072756fe412c212f2da0a252ced5f44441
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1403393357-2070-4-git-send-email-fweisbec@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[bwh: Backported to 3.16 as dependency of commit b9023b91dd02
 "tick: broadcast-hrtimer: Fix a race in bc_set_next":
 - Adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Viresh Kumar 2014-06-22 01:29:15 +02:00 committed by syphyr
parent 71980b81bf
commit 4e2f293610
2 changed files with 3 additions and 0 deletions
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2
include/linux/hrtimer.h
View File

@ -154,6 +154,7 @@ enum hrtimer_base_type {
* struct hrtimer_cpu_base - the per cpu clock bases
* @lock: lock protecting the base and associated clock bases
* and timers
* @cpu: cpu number
* @active_bases: Bitfield to mark bases with active timers
* @clock_was_set: Indicates that clock was set from irq context.
* @expires_next: absolute time of the next event which was scheduled
@ -169,6 +170,7 @@ enum hrtimer_base_type {
*/
struct hrtimer_cpu_base {
raw_spinlock_t lock;
unsigned int cpu;
unsigned int active_bases;
unsigned int clock_was_set;
#ifdef CONFIG_HIGH_RES_TIMERS

1
kernel/hrtimer.c
View File

@ -1660,6 +1660,7 @@ static void __cpuinit init_hrtimers_cpu(int cpu)
}
cpu_base->active_bases = 0;
cpu_base->cpu = cpu;
hrtimer_init_hres(cpu_base);
}