From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Campbell Subject: [PATCH for-4.5 v2 7/8] xen: arm: weaken SMP barriers to inner shareable. Date: Thu, 13 Feb 2014 12:38:07 +0000 Message-ID: <1392295088-24219-7-git-send-email-ian.campbell@citrix.com> References: <1392295040.31985.7.camel@kazak.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1392295040.31985.7.camel@kazak.uk.xensource.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xen.org Cc: julien.grall@linaro.org, tim@xen.org, Ian Campbell , stefano.stabellini@eu.citrix.com List-Id: xen-devel@lists.xenproject.org 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 --- xen/include/asm-arm/system.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/xen/include/asm-arm/system.h b/xen/include/asm-arm/system.h index e1f126a..32ed277 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)))) -- 1.7.10.4