smp: bf561: and smb_wmb()/smp_rmb() at ipi send/receive

add smb_wmb()/smp_rmb() to keep cache coherent

Signed-off-by: Steven Miao <realmz6@gmail.com>

diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
index 82f301c117a508b562cf16bd698f61e1ed9f0797..2bbae07838198912aa4beda231a0f96eaa647bd5 100644 (file)
--- a/arch/blackfin/mach-common/smp.c
+++ b/arch/blackfin/mach-common/smp.c
@@ -146,6 +146,7 @@ static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
 
        platform_clear_ipi(cpu, IRQ_SUPPLE_1);
 
+       smp_rmb();
        bfin_ipi_data = &__get_cpu_var(bfin_ipi);
        while ((pending = atomic_xchg(&bfin_ipi_data->bits, 0)) != 0) {
                msg = 0;
@@ -161,18 +162,20 @@ static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
                        case BFIN_IPI_CALL_FUNC:
                                generic_smp_call_function_interrupt();
                                break;
-
                        case BFIN_IPI_CALL_FUNC_SINGLE:
                                generic_smp_call_function_single_interrupt();
                                break;
-
                        case BFIN_IPI_CPU_STOP:
                                ipi_cpu_stop(cpu);
                                break;
+                       default:
+                               goto out;
                        }
                        atomic_dec(&bfin_ipi_data->count);
                } while (msg < BITS_PER_LONG);
+
        }
+out:
        return IRQ_HANDLED;
 }
 
@@ -198,10 +201,11 @@ void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
                bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
                atomic_set_mask((1 << msg), &bfin_ipi_data->bits);
                atomic_inc(&bfin_ipi_data->count);
-               platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
        }
-
        local_irq_restore(flags);
+       smp_wmb();
+       for_each_cpu(cpu, cpumask)
+               platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
 }
 
 void arch_send_call_function_single_ipi(int cpu)