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| author | Steven Miao <realmz6@gmail.com> | 2013-11-15 08:41:35 +0100 |
|---|---|---|
| committer | Steven Miao <realmz6@gmail.com> | 2013-11-15 11:14:49 +0100 |
| commit | 177a48fdc8a0156b32f96d9d0056361d88203983 (patch) | |
| tree | 23f3fb2c7a17708623a84d1db63475850d5a0a17 /arch/blackfin | |
| parent | pm: use GFP_ATOMIC when pm core call this function (diff) | |
| download | linux-177a48fdc8a0156b32f96d9d0056361d88203983.tar.xz linux-177a48fdc8a0156b32f96d9d0056361d88203983.zip | |
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')
| -rw-r--r-- | arch/blackfin/mach-common/smp.c | 12 |
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) |