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    Subject[PATCH 6/8] ia64: add support for remotely triggering the block softirq
    Date
    Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
    ---
    arch/ia64/kernel/smp.c | 14 ++++++++++++++
    1 files changed, 14 insertions(+), 0 deletions(-)

    diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c
    index 4e446aa..96f8ffa 100644
    --- a/arch/ia64/kernel/smp.c
    +++ b/arch/ia64/kernel/smp.c
    @@ -80,6 +80,7 @@ static volatile struct call_data_struct *call_data;
    #define IPI_CALL_FUNC 0
    #define IPI_CPU_STOP 1
    #define IPI_KDUMP_CPU_STOP 3
    +#define IPI_BLOCK_SOFTIRQ 4

    /* This needs to be cacheline aligned because it is written to by *other* CPUs. */
    static DEFINE_PER_CPU_SHARED_ALIGNED(u64, ipi_operation);
    @@ -174,6 +175,14 @@ handle_IPI (int irq, void *dev_id)
    unw_init_running(kdump_cpu_freeze, NULL);
    break;
    #endif
    + case IPI_BLOCK_SOFTIRQ: {
    + unsigned long flags;
    +
    + local_irq_save(flags);
    + raise_softirq_irqoff(BLOCK_SOFTIRQ);
    + local_irq_restore(flags);
    + break;
    + }
    default:
    printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n", this_cpu, which);
    break;
    @@ -461,6 +470,11 @@ smp_call_function (void (*func) (void *info), void *info, int nonatomic, int wai
    }
    EXPORT_SYMBOL(smp_call_function);

    +void arch_raise_softirq_on_cpu(int cpuid)
    +{
    + send_IPI_single(cpuid, IPI_BLOCK_SOFTIRQ);
    +}
    +
    /*
    * this function calls the 'stop' function on all other CPUs in the system.
    */
    --
    1.5.4.22.g7a20


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