Hibernation: Introduce begin() and end() callbacks

[linux-2.6-omap-h63xx.git] / include / linux / highmem.h

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 98e2cce996a4c1867543ffa03d83c66c3c8846de..1fcb0033179ec4e68442a5cc389c8f93a6bcd528 100644 (file)
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -73,10 +73,27 @@ static inline void clear_user_highpage(struct page *page, unsigned long vaddr)
 }
 
 #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
+/**
+ * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags
+ * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE
+ * @vma: The VMA the page is to be allocated for
+ * @vaddr: The virtual address the page will be inserted into
+ *
+ * This function will allocate a page for a VMA but the caller is expected
+ * to specify via movableflags whether the page will be movable in the
+ * future or not
+ *
+ * An architecture may override this function by defining
+ * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own
+ * implementation.
+ */
 static inline struct page *
-alloc_zeroed_user_highpage(struct vm_area_struct *vma, unsigned long vaddr)
+__alloc_zeroed_user_highpage(gfp_t movableflags,
+                       struct vm_area_struct *vma,
+                       unsigned long vaddr)
 {
-       struct page *page = alloc_page_vma(GFP_HIGHUSER, vma, vaddr);
+       struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags,
+                       vma, vaddr);
 
        if (page)
                clear_user_highpage(page, vaddr);
@@ -85,6 +102,21 @@ alloc_zeroed_user_highpage(struct vm_area_struct *vma, unsigned long vaddr)
 }
 #endif
 
+/**
+ * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move
+ * @vma: The VMA the page is to be allocated for
+ * @vaddr: The virtual address the page will be inserted into
+ *
+ * This function will allocate a page for a VMA that the caller knows will
+ * be able to migrate in the future using move_pages() or reclaimed
+ */
+static inline struct page *
+alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma,
+                                       unsigned long vaddr)
+{
+       return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr);
+}
+
 static inline void clear_highpage(struct page *page)
 {
        void *kaddr = kmap_atomic(page, KM_USER0);