config GENERIC_TIME_VSYSCALL
bool
-# Old style timekeeping
-config ARCH_USES_GETTIMEOFFSET
- bool
-
# The generic clock events infrastructure
config GENERIC_CLOCKEVENTS
- bool
+ def_bool !LEGACY_TIMER_TICK
# Architecture can handle broadcast in a driver-agnostic way
config ARCH_HAS_TICK_BROADCAST
bool
default y if POSIX_TIMERS && HAVE_POSIX_CPU_TIMERS_TASK_WORK
+config LEGACY_TIMER_TICK
+ bool
+ help
+ The legacy timer tick helper is used by platforms that
+ lack support for the generic clockevent framework.
+ New platforms should use generic clockevents instead.
+
if GENERIC_CLOCKEVENTS
menu "Timers subsystem"
config NO_HZ_COMMON
bool
- depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
select TICK_ONESHOT
choice
config NO_HZ_IDLE
bool "Idle dynticks system (tickless idle)"
- depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
select NO_HZ_COMMON
help
This option enables a tickless idle system: timer interrupts
config NO_HZ_FULL
bool "Full dynticks system (tickless)"
# NO_HZ_COMMON dependency
- depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
# We need at least one periodic CPU for timekeeping
depends on SMP
depends on HAVE_CONTEXT_TRACKING
dynticks working.
This option stands for testing when an arch implements the
- context tracking backend but doesn't yet fullfill all the
+ context tracking backend but doesn't yet fulfill all the
requirements to make the full dynticks feature working.
Without the full dynticks, there is no way to test the support
for context tracking and the subsystems that rely on it: RCU
config NO_HZ
bool "Old Idle dynticks config"
- depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
help
This is the old config entry that enables dynticks idle.
We keep it around for a little while to enforce backward
config HIGH_RES_TIMERS
bool "High Resolution Timer Support"
- depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
select TICK_ONESHOT
help
This option enables high resolution timer support. If your
/* Empty, the tick restart happens on tick_nohz_irq_exit() */
}
-static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = {
- .func = nohz_full_kick_func,
- .flags = ATOMIC_INIT(IRQ_WORK_HARD_IRQ),
-};
+static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) =
+ IRQ_WORK_INIT_HARD(nohz_full_kick_func);
/*
* Kick this CPU if it's full dynticks in order to force it to
*/
if (tick_do_timer_cpu == cpu)
return false;
- /*
- * Boot safety: make sure the timekeeping duty has been
- * assigned before entering dyntick-idle mode,
- * tick_do_timer_cpu is TICK_DO_TIMER_BOOT
- */
- if (unlikely(tick_do_timer_cpu == TICK_DO_TIMER_BOOT))
- return false;
/* Should not happen for nohz-full */
if (WARN_ON_ONCE(tick_do_timer_cpu == TICK_DO_TIMER_NONE))