[PATCH] sched: provide scheduler_ipi() callback in response to smp_send_reschedule()

[benh@kernel.crashing.org (Benjamin Herrenschmidt)]

On Mon, 2011-01-17 at 12:07 +0100, Peter Zijlstra wrote:
> diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> index 68034bb..7ee0fc3 100644
> --- a/arch/powerpc/kernel/smp.c
> +++ b/arch/powerpc/kernel/smp.c
> @@ -128,6 +128,7 @@ static irqreturn_t call_function_action(int irq, void *data)
>  static irqreturn_t reschedule_action(int irq, void *data)
>  {
>         /* we just need the return path side effect of checking need_resched */
> +       scheduler_ipi();
>         return IRQ_HANDLED;
>  }
>   

You missed:

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 9813605..467d122 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -98,6 +98,7 @@ void smp_message_recv(int msg)
                break;
        case PPC_MSG_RESCHEDULE:
                /* we notice need_resched on exit */
+               scheduler_ipi();
                break;
        case PPC_MSG_CALL_FUNC_SINGLE:
                generic_smp_call_function_single_interrupt();

Fold that in and add:

Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

(We have two variants of the IPIs)

Cheers,
Ben.