xen: balloon: allow PVMMU interfaces to be compiled out
The ARM platform has no concept of PVMMU and therefor no
HYPERVISOR_update_va_mapping et al. Allow this code to be compiled out
when not required.
In some similar situations (e.g. P2M) we have defined dummy functions
to avoid this, however I think we can/should draw the line at dummying
out actual hypercalls.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index d6886d9..a56776d 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -359,6 +359,7 @@
set_phys_to_machine(pfn, frame_list[i]);
+#ifdef CONFIG_XEN_HAVE_PVMMU
/* Link back into the page tables if not highmem. */
if (xen_pv_domain() && !PageHighMem(page)) {
int ret;
@@ -368,6 +369,7 @@
0);
BUG_ON(ret);
}
+#endif
/* Relinquish the page back to the allocator. */
ClearPageReserved(page);
@@ -416,13 +418,14 @@
scrub_page(page);
+#ifdef CONFIG_XEN_HAVE_PVMMU
if (xen_pv_domain() && !PageHighMem(page)) {
ret = HYPERVISOR_update_va_mapping(
(unsigned long)__va(pfn << PAGE_SHIFT),
__pte_ma(0), 0);
BUG_ON(ret);
}
-
+#endif
}
/* Ensure that ballooned highmem pages don't have kmaps. */