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Commit a80e49e2 authored by Frederic Weisbecker's avatar Frederic Weisbecker
Browse files

nohz: Move nohz full init call to tick init 



This way we unbloat a bit main.c and more importantly we initialize
nohz full after init_IRQ(). This dependency will be needed in further
patches because nohz full needs irq work to raise its own IRQ.
Information about the support for this ability on ARM64 is obtained on
init_IRQ() which initialize the pointer to __smp_call_function.

Since tick_init() is called right after init_IRQ(), this is a good place
to call tick_nohz_init() and prepare for that dependency.

Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
parent 2ce7598c

include/linux/tick.h

+0 −2
Original line number Diff line number Diff line
@@ -181,14 +181,12 @@ static inline bool tick_nohz_full_cpu(int cpu) 
	return cpumask_test_cpu(cpu, tick_nohz_full_mask);

}



extern void tick_nohz_init(void);

extern void __tick_nohz_full_check(void);

extern void tick_nohz_full_kick(void);

extern void tick_nohz_full_kick_cpu(int cpu);

extern void tick_nohz_full_kick_all(void);

extern void __tick_nohz_task_switch(struct task_struct *tsk);

#else

static inline void tick_nohz_init(void) { }

static inline bool tick_nohz_full_enabled(void) { return false; }

static inline bool tick_nohz_full_cpu(int cpu) { return false; }

static inline void __tick_nohz_full_check(void) { }

init/main.c

+0 −1
Original line number Diff line number Diff line
@@ -577,7 +577,6 @@ asmlinkage __visible void __init start_kernel(void) 
		local_irq_disable();

	idr_init_cache();

	rcu_init();

	tick_nohz_init();

	context_tracking_init();

	radix_tree_init();

	/* init some links before init_ISA_irqs() */

kernel/time/tick-common.c

+1 −0
Original line number Diff line number Diff line
@@ -400,4 +400,5 @@ void tick_resume(void) 
void __init tick_init(void)

{

	tick_broadcast_init();

	tick_nohz_init();

}

kernel/time/tick-internal.h

+7 −0
Original line number Diff line number Diff line
@@ -99,6 +99,13 @@ static inline int tick_broadcast_oneshot_active(void) { return 0; } 
static inline bool tick_broadcast_oneshot_available(void) { return false; }

#endif /* !TICK_ONESHOT */



/* NO_HZ_FULL internal */

#ifdef CONFIG_NO_HZ_FULL

extern void tick_nohz_init(void);

# else

static inline void tick_nohz_init(void) { }

#endif



/*

 * Broadcasting support

 */