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arm64: barriers: add dmb barrier

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Commit 8adbf57fc4 ("irqchip: gic: use dmb ishst instead of dsb when
raising a softirq") added an explicit dmb(...) call to the GIC driver.

This patch adds a simple dmb() macro to arm64, which expands to a DMB SY
instruction.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit d152d22a18)
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Will Deacon
2014-03-10 10:36:52 +00:00
committed by Mark Brown
parent 0fc36c0228
commit c83b7c920a
1 changed files with 1 additions and 0 deletions
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1
arch/arm64/include/asm/barrier.h
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@@ -25,6 +25,7 @@
#define wfi() asm volatile("wfi" : : : "memory")
#define isb() asm volatile("isb" : : : "memory")
#define dmb(opt) asm volatile("dmb sy" : : : "memory")
#define dsb(opt) asm volatile("dsb sy" : : : "memory")
#define mb() dsb()