D3355.diff
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	Index: head/sys/arm/arm/stdatomic.c
	===================================================================
	--- head/sys/arm/arm/stdatomic.c
	+++ head/sys/arm/arm/stdatomic.c
	@@ -32,6 +32,7 @@
	#include <sys/types.h>

	#include <machine/acle-compat.h>
	+#include <machine/atomic.h>
	#include <machine/cpufunc.h>
	#include <machine/sysarch.h>

	@@ -67,19 +68,12 @@

	__asm volatile ("" : : : "memory");
	}
	-#elif __ARM_ARCH >= 7
	-static inline void
	-do_sync(void)
	-{
	-
	- __asm volatile ("dmb" : : : "memory");
	-}
	#elif __ARM_ARCH >= 6
	static inline void
	do_sync(void)
	{

	- __asm volatile ("mcr p15, 0, %0, c7, c10, 5" : : "r" (0) : "memory");
	+ dmb();
	}
	#endif