xen: Rename the balloon lock
* xen_create_contiguous_region needs access to the balloon lock to
ensure memory doesn't change under its feet, so expose the balloon
lock
* Change the name of the lock to xen_reservation_lock, to imply it's
now less-specific usage.
[ Impact: cleanup ]
Signed-off-by: Alex Nixon <alex.nixon@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@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 1a0d8c2..500290b 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -85,13 +85,6 @@
static int register_balloon(struct sys_device *sysdev);
-/*
- * Protects atomic reservation decrease/increase against concurrent increases.
- * Also protects non-atomic updates of current_pages and driver_pages, and
- * balloon lists.
- */
-static DEFINE_SPINLOCK(balloon_lock);
-
static struct balloon_stats balloon_stats;
/* We increase/decrease in batches which fit in a page */
@@ -210,7 +203,7 @@
if (nr_pages > ARRAY_SIZE(frame_list))
nr_pages = ARRAY_SIZE(frame_list);
- spin_lock_irqsave(&balloon_lock, flags);
+ spin_lock_irqsave(&xen_reservation_lock, flags);
page = balloon_first_page();
for (i = 0; i < nr_pages; i++) {
@@ -254,7 +247,7 @@
balloon_stats.current_pages += rc;
out:
- spin_unlock_irqrestore(&balloon_lock, flags);
+ spin_unlock_irqrestore(&xen_reservation_lock, flags);
return rc < 0 ? rc : rc != nr_pages;
}
@@ -299,7 +292,7 @@
kmap_flush_unused();
flush_tlb_all();
- spin_lock_irqsave(&balloon_lock, flags);
+ spin_lock_irqsave(&xen_reservation_lock, flags);
/* No more mappings: invalidate P2M and add to balloon. */
for (i = 0; i < nr_pages; i++) {
@@ -315,7 +308,7 @@
balloon_stats.current_pages -= nr_pages;
- spin_unlock_irqrestore(&balloon_lock, flags);
+ spin_unlock_irqrestore(&xen_reservation_lock, flags);
return need_sleep;
}