[Xen-changelog] [xen master] xen: arm: use more specific barriers for read and write barriers.

[patchbot@xxxxxxx]

commit 652302e12e7f189274eae0193527a039808a524c
Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Mon Mar 17 14:53:30 2014 +0000
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Tue Mar 18 15:55:27 2014 +0000

    xen: arm: use more specific barriers for read and write barriers.
    
    Note that 32-bit does not provide a load variant of the inner shareable
    barrier, so that remains a full any-any barrier.
    
    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 |   17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/xen/include/asm-arm/system.h b/xen/include/asm-arm/system.h
index 32ed277..7aaaf50 100644
--- a/xen/include/asm-arm/system.h
+++ b/xen/include/asm-arm/system.h
@@ -17,12 +17,21 @@
 #define dmb(scope)      asm volatile("dmb " #scope : : : "memory")
 
 #define mb()            dsb(sy)
-#define rmb()           dsb(sy)
-#define wmb()           dsb(sy)
+#ifdef CONFIG_ARM_64
+#define rmb()           dsb(ld)
+#else
+#define rmb()           dsb(sy) /* 32-bit has no ld variant. */
+#endif
+#define wmb()           dsb(st)
 
 #define smp_mb()        dmb(ish)
-#define smp_rmb()       dmb(ish)
-#define smp_wmb()       dmb(ish)
+#ifdef CONFIG_ARM_64
+#define smp_rmb()       dmb(ishld)
+#else
+#define smp_rmb()       dmb(ish) /* 32-bit has no ishld variant. */
+#endif
+
+#define smp_wmb()       dmb(ishst)
 
 #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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