Merge branch 'dde' into upstream-merged

1 files changed, 146 insertions, 0 deletions

diff --git a/libdde_linux26/contrib/include/linux/rmap.h b/libdde_linux26/contrib/include/linux/rmap.h
new file mode 100644
index 00000000..b35bc0e1
--- /dev/null
+++ b/libdde_linux26/contrib/include/linux/rmap.h
@@ -0,0 +1,146 @@
+#ifndef _LINUX_RMAP_H
+#define _LINUX_RMAP_H
+/*
+ * Declarations for Reverse Mapping functions in mm/rmap.c
+ */
+
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/spinlock.h>
+#include <linux/memcontrol.h>
+
+/*
+ * The anon_vma heads a list of private "related" vmas, to scan if
+ * an anonymous page pointing to this anon_vma needs to be unmapped:
+ * the vmas on the list will be related by forking, or by splitting.
+ *
+ * Since vmas come and go as they are split and merged (particularly
+ * in mprotect), the mapping field of an anonymous page cannot point
+ * directly to a vma: instead it points to an anon_vma, on whose list
+ * the related vmas can be easily linked or unlinked.
+ *
+ * After unlinking the last vma on the list, we must garbage collect
+ * the anon_vma object itself: we're guaranteed no page can be
+ * pointing to this anon_vma once its vma list is empty.
+ */
+struct anon_vma {
+	spinlock_t lock;	/* Serialize access to vma list */
+	/*
+	 * NOTE: the LSB of the head.next is set by
+	 * mm_take_all_locks() _after_ taking the above lock. So the
+	 * head must only be read/written after taking the above lock
+	 * to be sure to see a valid next pointer. The LSB bit itself
+	 * is serialized by a system wide lock only visible to
+	 * mm_take_all_locks() (mm_all_locks_mutex).
+	 */
+	struct list_head head;	/* List of private "related" vmas */
+};
+
+#ifdef CONFIG_MMU
+
+static inline void anon_vma_lock(struct vm_area_struct *vma)
+{
+	struct anon_vma *anon_vma = vma->anon_vma;
+	if (anon_vma)
+		spin_lock(&anon_vma->lock);
+}
+
+static inline void anon_vma_unlock(struct vm_area_struct *vma)
+{
+	struct anon_vma *anon_vma = vma->anon_vma;
+	if (anon_vma)
+		spin_unlock(&anon_vma->lock);
+}
+
+/*
+ * anon_vma helper functions.
+ */
+void anon_vma_init(void);	/* create anon_vma_cachep */
+int  anon_vma_prepare(struct vm_area_struct *);
+void __anon_vma_merge(struct vm_area_struct *, struct vm_area_struct *);
+void anon_vma_unlink(struct vm_area_struct *);
+void anon_vma_link(struct vm_area_struct *);
+void __anon_vma_link(struct vm_area_struct *);
+
+/*
+ * rmap interfaces called when adding or removing pte of page
+ */
+void page_add_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
+void page_add_new_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
+void page_add_file_rmap(struct page *);
+void page_remove_rmap(struct page *);
+
+#ifdef CONFIG_DEBUG_VM
+void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address);
+#else
+static inline void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address)
+{
+	atomic_inc(&page->_mapcount);
+}
+#endif
+
+/*
+ * Called from mm/vmscan.c to handle paging out
+ */
+int page_referenced(struct page *, int is_locked, struct mem_cgroup *cnt);
+int try_to_unmap(struct page *, int ignore_refs);
+
+/*
+ * Called from mm/filemap_xip.c to unmap empty zero page
+ */
+pte_t *page_check_address(struct page *, struct mm_struct *,
+				unsigned long, spinlock_t **, int);
+
+/*
+ * Used by swapoff to help locate where page is expected in vma.
+ */
+unsigned long page_address_in_vma(struct page *, struct vm_area_struct *);
+
+/*
+ * Cleans the PTEs of shared mappings.
+ * (and since clean PTEs should also be readonly, write protects them too)
+ *
+ * returns the number of cleaned PTEs.
+ */
+int page_mkclean(struct page *);
+
+#ifdef CONFIG_UNEVICTABLE_LRU
+/*
+ * called in munlock()/munmap() path to check for other vmas holding
+ * the page mlocked.
+ */
+int try_to_munlock(struct page *);
+#else
+static inline int try_to_munlock(struct page *page)
+{
+	return 0;	/* a.k.a. SWAP_SUCCESS */
+}
+#endif
+
+#else	/* !CONFIG_MMU */
+
+#define anon_vma_init()		do {} while (0)
+#define anon_vma_prepare(vma)	(0)
+#define anon_vma_link(vma)	do {} while (0)
+
+#define page_referenced(page,l,cnt) TestClearPageReferenced(page)
+#define try_to_unmap(page, refs) SWAP_FAIL
+
+static inline int page_mkclean(struct page *page)
+{
+	return 0;
+}
+
+
+#endif	/* CONFIG_MMU */
+
+/*
+ * Return values of try_to_unmap
+ */
+#define SWAP_SUCCESS	0
+#define SWAP_AGAIN	1
+#define SWAP_FAIL	2
+#define SWAP_MLOCK	3
+
+#endif	/* _LINUX_RMAP_H */