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authorLinus Torvalds <torvalds@linux-foundation.org>2017-11-16 13:14:46 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-16 13:14:46 -0800
commit18c83d2c0390fd0e8336ad090a047c56037d19f5 (patch)
tree7042614cea7b22d5b0fa35ee7a4fa95124008246 /mm
parent051089a2eed9a9977080774f3793ff2688cd3878 (diff)
parentc1d0c3f623ada808904dec676da0126f5b800630 (diff)
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
Pull virtio updates from Michael Tsirkin: "Fixes in qemu, vhost and virtio" * tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: fw_cfg: fix the command line module name vhost/vsock: fix uninitialized vhost_vsock->guest_cid vhost: fix end of range for access_ok vhost/scsi: Use safe iteration in vhost_scsi_complete_cmd_work() virtio_balloon: fix deadlock on OOM
Diffstat (limited to 'mm')
-rw-r--r--mm/balloon_compaction.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c
index 68d28924ba79..ef858d547e2d 100644
--- a/mm/balloon_compaction.c
+++ b/mm/balloon_compaction.c
@@ -11,22 +11,37 @@
#include <linux/balloon_compaction.h>
/*
+ * balloon_page_alloc - allocates a new page for insertion into the balloon
+ * page list.
+ *
+ * Driver must call it to properly allocate a new enlisted balloon page.
+ * Driver must call balloon_page_enqueue before definitively removing it from
+ * the guest system. This function returns the page address for the recently
+ * allocated page or NULL in the case we fail to allocate a new page this turn.
+ */
+struct page *balloon_page_alloc(void)
+{
+ struct page *page = alloc_page(balloon_mapping_gfp_mask() |
+ __GFP_NOMEMALLOC | __GFP_NORETRY);
+ return page;
+}
+EXPORT_SYMBOL_GPL(balloon_page_alloc);
+
+/*
* balloon_page_enqueue - allocates a new page and inserts it into the balloon
* page list.
* @b_dev_info: balloon device descriptor where we will insert a new page to
+ * @page: new page to enqueue - allocated using balloon_page_alloc.
*
- * Driver must call it to properly allocate a new enlisted balloon page
+ * Driver must call it to properly enqueue a new allocated balloon page
* before definitively removing it from the guest system.
* This function returns the page address for the recently enqueued page or
* NULL in the case we fail to allocate a new page this turn.
*/
-struct page *balloon_page_enqueue(struct balloon_dev_info *b_dev_info)
+void balloon_page_enqueue(struct balloon_dev_info *b_dev_info,
+ struct page *page)
{
unsigned long flags;
- struct page *page = alloc_page(balloon_mapping_gfp_mask() |
- __GFP_NOMEMALLOC | __GFP_NORETRY);
- if (!page)
- return NULL;
/*
* Block others from accessing the 'page' when we get around to
@@ -39,7 +54,6 @@ struct page *balloon_page_enqueue(struct balloon_dev_info *b_dev_info)
__count_vm_event(BALLOON_INFLATE);
spin_unlock_irqrestore(&b_dev_info->pages_lock, flags);
unlock_page(page);
- return page;
}
EXPORT_SYMBOL_GPL(balloon_page_enqueue);