[PATCH v1 4/4] xen/pci: solve compilation error when memory paging is not enabled.

[Rahul Singh <rahul.singh@xxxxxxx>]

d->vm_event_paging struct is defined under CONFIG_HAS_MEM_PAGING in
sched.h but referenced in passthrough/pci.c directly.

If CONFIG_HAS_MEM_PAGING is not enabled for architecture, compiler will
throws an error.

No functional change.

Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
---
 xen/drivers/passthrough/pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c
index c6fbb7172c..3125c23e87 100644
--- a/xen/drivers/passthrough/pci.c
+++ b/xen/drivers/passthrough/pci.c
@@ -1419,13 +1419,15 @@ static int assign_device(struct domain *d, u16 seg, u8 
bus, u8 devfn, u32 flag)
     if ( !is_iommu_enabled(d) )
         return 0;
 
-    /* Prevent device assign if mem paging or mem sharing have been 
+#if defined(CONFIG_HAS_MEM_PAGING) || defined(CONFIG_MEM_SHARING)
+    /* Prevent device assign if mem paging or mem sharing have been
      * enabled for this domain */
     if ( d != dom_io &&
          unlikely(mem_sharing_enabled(d) ||
                   vm_event_check_ring(d->vm_event_paging) ||
                   p2m_get_hostp2m(d)->global_logdirty) )
         return -EXDEV;
+#endif
 
     /* device_assigned() should already have cleared the device for assignment 
*/
     ASSERT(pcidevs_locked());
-- 
2.17.1