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irqchip/bcm2836: Use a more generic memory barrier call
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@anholt.net> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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@ -195,7 +195,7 @@ static void bcm2836_arm_irqchip_send_ipi(const struct cpumask *mask,
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* Ensure that stores to normal memory are visible to the
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* other CPUs before issuing the IPI.
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*/
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dsb();
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smp_wmb();
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for_each_cpu(cpu, mask) {
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writel(1 << ipi, mailbox0_base + 16 * cpu);
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