[Xen-changelog] [xen master] xen: arm: weaken SMP barriers to inner shareable.

[patchbot@xxxxxxx]

commit fc62d6285964ebf809864e40d76797ed745523e4
Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Mon Mar 17 14:53:29 2014 +0000
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Tue Mar 18 15:55:27 2014 +0000

    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 <ian.campbell@xxxxxxxxxx>
    Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
    Acked-by: Tim Deegan <tim@xxxxxxx>
---
 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 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))))
--
generated by git-patchbot for /home/xen/git/xen.git#master

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