Commit ae9e557b authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

time: Export tick start/stop functions for rcutorture 



It turns out that rcutorture needs to ensure that the scheduling-clock
interrupt is enabled in CONFIG_NO_HZ_FULL kernels before starting on
CPU-bound in-kernel processing.  This commit therefore exports
tick_nohz_dep_set_task(), tick_nohz_dep_clear_task(), and
tick_nohz_full_setup() to GPL kernel modules.

Reported-by: default avatarkbuild test robot <lkp@intel.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 01b4c399

kernel/time/tick-sched.c

+4 −0
Original line number Diff line number Diff line
@@ -172,6 +172,7 @@ static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs) 
#ifdef CONFIG_NO_HZ_FULL

cpumask_var_t tick_nohz_full_mask;

bool tick_nohz_full_running;

EXPORT_SYMBOL_GPL(tick_nohz_full_running);

static atomic_t tick_dep_mask;



static bool check_tick_dependency(atomic_t *dep)
@@ -351,11 +352,13 @@ void tick_nohz_dep_set_task(struct task_struct *tsk, enum tick_dep_bits bit) 
	 */

	tick_nohz_dep_set_all(&tsk->tick_dep_mask, bit);

}

EXPORT_SYMBOL_GPL(tick_nohz_dep_set_task);



void tick_nohz_dep_clear_task(struct task_struct *tsk, enum tick_dep_bits bit)

{

	atomic_andnot(BIT(bit), &tsk->tick_dep_mask);

}

EXPORT_SYMBOL_GPL(tick_nohz_dep_clear_task);



/*

 * Set a per-taskgroup tick dependency. Posix CPU timers need this in order to elapse
@@ -404,6 +407,7 @@ void __init tick_nohz_full_setup(cpumask_var_t cpumask) 
	cpumask_copy(tick_nohz_full_mask, cpumask);

	tick_nohz_full_running = true;

}

EXPORT_SYMBOL_GPL(tick_nohz_full_setup);



static int tick_nohz_cpu_down(unsigned int cpu)

{

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