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arm64: ensure CPU clock retrieval issues isb()
[fio.git]
/
arch
/
arch-aarch64.h
diff --git
a/arch/arch-aarch64.h
b/arch/arch-aarch64.h
index 951d1718cfabfbe59469c3421b67d4bc8fb5e103..919e57967609b4b077c50396c5aaf0cc6f4a1d05 100644
(file)
--- a/
arch/arch-aarch64.h
+++ b/
arch/arch-aarch64.h
@@
-27,10
+27,13
@@
static inline int arch_ffz(unsigned long bitmask)
#define ARCH_HAVE_FFZ
+#define isb() asm volatile("isb" : : : "memory")
+
static inline unsigned long long get_cpu_clock(void)
{
unsigned long val;
+ isb();
asm volatile("mrs %0, cntvct_el0" : "=r" (val));
return val;
}