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    Subject[PATCH 08/12] task_isolation: don't interrupt CPUs with tick_nohz_full_kick_cpu()
    Date
    From: Yuri Norov <ynorov@marvell.com>

    For nohz_full CPUs the desirable behavior is to receive interrupts
    generated by tick_nohz_full_kick_cpu(). But for hard isolation it's
    obviously not desirable because it breaks isolation.

    This patch adds check for it.

    Signed-off-by: Alex Belits <abelits@marvell.com>
    ---
    kernel/time/tick-sched.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
    index 1d4dec9d3ee7..fe4503ba1316 100644
    --- a/kernel/time/tick-sched.c
    +++ b/kernel/time/tick-sched.c
    @@ -20,6 +20,7 @@
    #include <linux/sched/clock.h>
    #include <linux/sched/stat.h>
    #include <linux/sched/nohz.h>
    +#include <linux/isolation.h>
    #include <linux/module.h>
    #include <linux/irq_work.h>
    #include <linux/posix-timers.h>
    @@ -262,7 +263,7 @@ static void tick_nohz_full_kick(void)
    */
    void tick_nohz_full_kick_cpu(int cpu)
    {
    - if (!tick_nohz_full_cpu(cpu))
    + if (!tick_nohz_full_cpu(cpu) || task_isolation_on_cpu(cpu))
    return;

    irq_work_queue_on(&per_cpu(nohz_full_kick_work, cpu), cpu);
    --
    2.20.1
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