From: Ian Campbell Date: Mon, 17 Mar 2014 14:53:29 +0000 (+0000) Subject: xen: arm: weaken SMP barriers to inner shareable. X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~5393 X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=fc62d6285964ebf809864e40d76797ed745523e4;p=xen.git 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 principle 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 Acked-by: Stefano Stabellini Acked-by: Tim Deegan --- diff --git a/xen/include/asm-arm/system.h b/xen/include/asm-arm/system.h index e1f126a2a3..32ed277be7 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))))