[RFC PATCH 1/4] xen/arm: Add wrapper find_unused_regions

[Koichiro Den <den@xxxxxxxxxxxxx>]

This is preparatory work for the upcoming commits that implement the
standard PV time interface (ARM DEN 0057A).

No functional changes intended.

Signed-off-by: Koichiro Den <den@xxxxxxxxxxxxx>
---
 xen/arch/arm/domain_build.c | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 4ff161887ec3..9d44b6fa9470 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1070,6 +1070,23 @@ static int __init find_host_extended_regions(const 
struct kernel_info *kinfo,
     return res;
 }
 
+static int __init find_unused_regions(struct domain *d,
+                                      const struct kernel_info *kinfo,
+                                      struct membanks *ext_regions)
+{
+    if ( domain_use_host_layout(d) )
+    {
+        if ( !is_iommu_enabled(d) )
+            return find_host_extended_regions(kinfo, ext_regions);
+        else
+            return find_memory_holes(kinfo, ext_regions);
+    }
+    else
+    {
+        return find_domU_holes(kinfo, ext_regions);
+    }
+}
+
 int __init make_hypervisor_node(struct domain *d,
                                 const struct kernel_info *kinfo,
                                 int addrcells, int sizecells)
@@ -1121,17 +1138,7 @@ int __init make_hypervisor_node(struct domain *d,
         if ( !ext_regions )
             return -ENOMEM;
 
-        if ( domain_use_host_layout(d) )
-        {
-            if ( !is_iommu_enabled(d) )
-                res = find_host_extended_regions(kinfo, ext_regions);
-            else
-                res = find_memory_holes(kinfo, ext_regions);
-        }
-        else
-        {
-            res = find_domU_holes(kinfo, ext_regions);
-        }
+        res = find_unused_regions(d, kinfo, ext_regions);
 
         if ( res )
             printk(XENLOG_WARNING "%pd: failed to allocate extended regions\n",
-- 
2.48.1