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Commit 177a48fd authored by Steven Miao's avatar Steven Miao
Browse files

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



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

Signed-off-by: default avatarSteven Miao <realmz6@gmail.com>
parent aefefe92

arch/blackfin/mach-common/smp.c

+8 −4
Original line number Diff line number Diff line
@@ -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)