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    Subject[PATCH v6 14/46] sched/rt: Use get/put_online_cpus_atomic() to prevent CPU offline
    Date
    Once stop_machine() is gone from the CPU offline path, we won't be able to
    depend on preempt_disable() or local_irq_disable() to prevent CPUs from
    going offline from under us.

    Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going offline,
    while invoking from atomic context.

    Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
    ---

    kernel/sched/rt.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
    index 4f02b28..e546c98 100644
    --- a/kernel/sched/rt.c
    +++ b/kernel/sched/rt.c
    @@ -6,6 +6,7 @@
    #include "sched.h"

    #include <linux/slab.h>
    +#include <linux/cpu.h>

    static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun);

    @@ -26,7 +27,9 @@ static enum hrtimer_restart sched_rt_period_timer(struct hrtimer *timer)
    if (!overrun)
    break;

    + get_online_cpus_atomic();
    idle = do_sched_rt_period_timer(rt_b, overrun);
    + put_online_cpus_atomic();
    }

    return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;


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