[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 09/10] xen: arm: weaken SMP barriers to inner shareable.
Since all processors are in the inner-shareable domain and we map everything that way this is sufficient. The non-SMP barriers remain full system. Although in principal they could become outer shareable barriers for some hardware this would require us to know which class a given device is. Given the small number of device drivers in Xen itself its probably not worth worrying over, although maybe someone will benchmark at some point. Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx> --- xen/include/asm-arm/system.h | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/xen/include/asm-arm/system.h b/xen/include/asm-arm/system.h index 68efba9..7c3e42d 100644 --- a/xen/include/asm-arm/system.h +++ b/xen/include/asm-arm/system.h @@ -20,9 +20,9 @@ #define rmb() dsb("sy") #define wmb() dsb("sy") -#define smp_mb() dmb("sy") -#define smp_rmb() dmb("sy") -#define smp_wmb() dmb("sy") +#define smp_mb() dmb("ish") +#define smp_rmb() dmb("ish") +#define smp_wmb() dmb("ish") #define xchg(ptr,x) \ ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) -- 1.7.2.5 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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