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authorSteven Miao <realmz6@gmail.com>2013-11-15 11:41:35 +0400
committerSteven Miao <realmz6@gmail.com>2013-11-15 14:14:49 +0400
commit177a48fdc8a0156b32f96d9d0056361d88203983 (patch)
tree23f3fb2c7a17708623a84d1db63475850d5a0a17 /arch/blackfin/mach-common
parentaefefe92116b776203f95f3249ae61b94f73f170 (diff)
downloadlinux-177a48fdc8a0156b32f96d9d0056361d88203983.tar.xz
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>
Diffstat (limited to 'arch/blackfin/mach-common')
-rw-r--r--arch/blackfin/mach-common/smp.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
index 82f301c117a5..2bbae0783819 100644
--- 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)