[PATCH v2 4/4] irqchip: bcm2836: Use a more generic memory barrier call

From: Eric Anholt
Date: Wed Apr 13 2016 - 16:29:07 EST


dsb() requires an argument on arm64, so we needed to add "sy".
Instead, take this opportunity to switch to the same smp_wmb() call
that gic uses for its IPIs. This is a less strong barrier than we
were doing before (dmb(ishst) compared to dsb(sy)), but it seems to be
the correct one.

Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
Acked-by: Stephen Warren <swarren@xxxxxxxxxxxxx>
---

v2: add ack

drivers/irqchip/irq-bcm2836.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-bcm2836.c b/drivers/irqchip/irq-bcm2836.c
index bb3d61fe4bdb..27875982657e 100644
--- a/drivers/irqchip/irq-bcm2836.c
+++ b/drivers/irqchip/irq-bcm2836.c
@@ -195,7 +195,7 @@ static void bcm2836_arm_irqchip_send_ipi(const struct cpumask *mask,
* Ensure that stores to normal memory are visible to the
* other CPUs before issuing the IPI.
*/
- dsb();
+ smp_wmb();

for_each_cpu(cpu, mask) {
writel(1 << ipi, mailbox0_base + 16 * cpu);
--
2.8.0.rc3