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    Subject[PATCH v2 34/45] hexagon/smp: 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 disabling preemption 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.

    Cc: Richard Kuo <rkuo@codeaurora.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: linux-hexagon@vger.kernel.org
    Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
    ---

    arch/hexagon/kernel/smp.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/arch/hexagon/kernel/smp.c b/arch/hexagon/kernel/smp.c
    index 0e364ca..30d4318 100644
    --- a/arch/hexagon/kernel/smp.c
    +++ b/arch/hexagon/kernel/smp.c
    @@ -241,9 +241,12 @@ void smp_send_reschedule(int cpu)
    void smp_send_stop(void)
    {
    struct cpumask targets;
    +
    + get_online_cpus_atomic();
    cpumask_copy(&targets, cpu_online_mask);
    cpumask_clear_cpu(smp_processor_id(), &targets);
    send_ipi(&targets, IPI_CPU_STOP);
    + put_online_cpus_atomic();
    }

    void arch_send_call_function_single_ipi(int cpu)


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