[Xen-devel] [PATCH 06/10] xen: arm: Use SMP barriers when that is all which is required.

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

As explained in the previous commit SMP barriers can be used when all we care
about is synchronising against other processors.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/mm.c      |    2 +-
 xen/arch/arm/smpboot.c |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index c5213f2..3f049cb 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -776,7 +776,7 @@ void share_xen_page_with_guest(struct page_info *page,
     page->u.inuse.type_info |= PGT_validated | 1;
 
     page_set_owner(page, d);
-    wmb(); /* install valid domain ptr before updating refcnt. */
+    smp_wmb(); /* install valid domain ptr before updating refcnt. */
     ASSERT((page->count_info & ~PGC_xen_heap) == 0);
 
     /* Only add to the allocation list if the domain isn't dying. */
diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
index 8011987..727e09f 100644
--- a/xen/arch/arm/smpboot.c
+++ b/xen/arch/arm/smpboot.c
@@ -170,11 +170,11 @@ void __cpuinit start_secondary(unsigned long 
boot_phys_offset,
 
     /* Run local notifiers */
     notify_cpu_starting(cpuid);
-    wmb();
+    smp_wmb();
 
     /* Now report this CPU is up */
     cpumask_set_cpu(cpuid, &cpu_online_map);
-    wmb();
+    smp_wmb();
 
     local_irq_enable();
 
-- 
1.7.2.5


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