xen/balloon: decorate PV-only parts with #ifdef CONFIG_XEN_PV

Balloon driver uses several PV-only concepts (xen_start_info,
xen_extra_mem,..) and it seems the simpliest solution to make HVM-only
build happy is to decorate these parts with #ifdefs.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index a6d4378..50dcb68 100644 (file)
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -709,6 +709,7 @@ void free_xenballooned_pages(int nr_pages, struct page **pages)
 }
 EXPORT_SYMBOL(free_xenballooned_pages);
 
+#ifdef CONFIG_XEN_PV
 static void __init balloon_add_region(unsigned long start_pfn,
                                      unsigned long pages)
 {
@@ -732,19 +733,22 @@ static void __init balloon_add_region(unsigned long start_pfn,
 
        balloon_stats.total_pages += extra_pfn_end - start_pfn;
 }
+#endif
 
 static int __init balloon_init(void)
 {
-       int i;
-
        if (!xen_domain())
                return -ENODEV;
 
        pr_info("Initialising balloon driver\n");
 
+#ifdef CONFIG_XEN_PV
        balloon_stats.current_pages = xen_pv_domain()
                ? min(xen_start_info->nr_pages - xen_released_pages, max_pfn)
                : get_num_physpages();
+#else
+       balloon_stats.current_pages = get_num_physpages();
+#endif
        balloon_stats.target_pages  = balloon_stats.current_pages;
        balloon_stats.balloon_low   = 0;
        balloon_stats.balloon_high  = 0;
@@ -761,14 +765,20 @@ static int __init balloon_init(void)
        register_sysctl_table(xen_root);
 #endif
 
-       /*
-        * Initialize the balloon with pages from the extra memory
-        * regions (see arch/x86/xen/setup.c).
-        */
-       for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++)
-               if (xen_extra_mem[i].n_pfns)
-                       balloon_add_region(xen_extra_mem[i].start_pfn,
-                                          xen_extra_mem[i].n_pfns);
+#ifdef CONFIG_XEN_PV
+       {
+               int i;
+
+               /*
+                * Initialize the balloon with pages from the extra memory
+                * regions (see arch/x86/xen/setup.c).
+                */
+               for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++)
+                       if (xen_extra_mem[i].n_pfns)
+                               balloon_add_region(xen_extra_mem[i].start_pfn,
+                                                  xen_extra_mem[i].n_pfns);
+       }
+#endif
 
        return 0;
 }