ACPI: fix acpi_find_child_device() invocation in acpi_preset_companion()

[mirror_ubuntu-bionic-kernel.git] / include / linux / balloon_compaction.h

diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h
index fbbe6da40feda116cd90c8041bd551d56b8b933f..53051f3d8f2561207c4da0d4e12aa1d7e5a0470b 100644 (file)
--- a/include/linux/balloon_compaction.h
+++ b/include/linux/balloon_compaction.h
@@ -50,6 +50,7 @@
 #include <linux/gfp.h>
 #include <linux/err.h>
 #include <linux/fs.h>
+#include <linux/list.h>
 
 /*
  * Balloon device information descriptor.
@@ -67,7 +68,9 @@ struct balloon_dev_info {
        struct inode *inode;
 };
 
-extern struct page *balloon_page_enqueue(struct balloon_dev_info *b_dev_info);
+extern struct page *balloon_page_alloc(void);
+extern void balloon_page_enqueue(struct balloon_dev_info *b_dev_info,
+                                struct page *page);
 extern struct page *balloon_page_dequeue(struct balloon_dev_info *b_dev_info);
 
 static inline void balloon_devinfo_init(struct balloon_dev_info *balloon)
@@ -193,4 +196,34 @@ static inline gfp_t balloon_mapping_gfp_mask(void)
 }
 
 #endif /* CONFIG_BALLOON_COMPACTION */
+
+/*
+ * balloon_page_push - insert a page into a page list.
+ * @head : pointer to list
+ * @page : page to be added
+ *
+ * Caller must ensure the page is private and protect the list.
+ */
+static inline void balloon_page_push(struct list_head *pages, struct page *page)
+{
+       list_add(&page->lru, pages);
+}
+
+/*
+ * balloon_page_pop - remove a page from a page list.
+ * @head : pointer to list
+ * @page : page to be added
+ *
+ * Caller must ensure the page is private and protect the list.
+ */
+static inline struct page *balloon_page_pop(struct list_head *pages)
+{
+       struct page *page = list_first_entry_or_null(pages, struct page, lru);
+
+       if (!page)
+               return NULL;
+
+       list_del(&page->lru);
+       return page;
+}
 #endif /* _LINUX_BALLOON_COMPACTION_H */