# HG changeset patch
# User yamahata@xxxxxxxxxxxxx
# Node ID b5117df9f8edf6eca8ff7dc8be7e7458817707c8
# Parent  9a39580dffc0a5f92d18bcd2098b786118ed6a71
xenLinux/ia64 doesn't use init_mm for ballooned area so that
apply_to_page_range() isn't needed, only XENMEM_decrease_reservation is needed.
PATCHNAME: balloon_driver_ia64

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>

diff -r 9a39580dffc0 -r b5117df9f8ed linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c
--- a/linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c	Fri Apr 28 15:20:20 2006 +0900
+++ b/linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c	Fri Apr 28 15:20:25 2006 +0900
@@ -517,6 +517,23 @@ void balloon_update_driver_allowance(lon
 	balloon_unlock(flags);
 }
 
+#ifdef __ia64__
+static int
+balloon_dealloc_range(unsigned long vstart, unsigned int order)
+{
+	int ret;
+	unsigned long gmfn = __pa(vstart) >> PAGE_SHIFT;
+	struct xen_memory_reservation reservation = {
+		.extent_start = &gmfn,
+		.nr_extents   = 1,
+		.extent_order = order,
+		.domid        = DOMID_SELF
+	};
+	ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
+	BUG_ON(ret != 1);
+	return 0;
+}
+#else
 static int dealloc_pte_fn(
 	pte_t *pte, struct page *pmd_page, unsigned long addr, void *data)
 {
@@ -535,6 +552,14 @@ static int dealloc_pte_fn(
 	return 0;
 }
 
+static int
+balloon_dealloc_range(unsigned long vstart, unsigned int order)
+{
+	return apply_to_page_range(&init_mm, vstart,
+				   PAGE_SIZE << order, dealloc_pte_fn, NULL);
+}
+#endif
+
 struct page *balloon_alloc_empty_page_range(unsigned long nr_pages)
 {
 	unsigned long vstart, flags;
@@ -548,8 +573,7 @@ struct page *balloon_alloc_empty_page_ra
 	scrub_pages(vstart, 1 << order);
 
 	balloon_lock(flags);
-	ret = apply_to_page_range(&init_mm, vstart,
-				  PAGE_SIZE << order, dealloc_pte_fn, NULL);
+	ret = balloon_dealloc_range(vstart, order);
 	BUG_ON(ret);
 	current_pages -= 1UL << order;
 	totalram_pages = current_pages;