Linux-libre 4.8.2-gnupck-4.8.2-gnu

1 files changed, 56 insertions, 15 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index eb8609559..a7724810d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -309,10 +309,34 @@ struct vm_fault {
 					 * VM_FAULT_DAX_LOCKED and fill in
 					 * entry here.
 					 */
-	/* for ->map_pages() only */
-	pgoff_t max_pgoff;		/* map pages for offset from pgoff till
-					 * max_pgoff inclusive */
-	pte_t *pte;			/* pte entry associated with ->pgoff */
+};
+
+/*
+ * Page fault context: passes though page fault handler instead of endless list
+ * of function arguments.
+ */
+struct fault_env {
+	struct vm_area_struct *vma;	/* Target VMA */
+	unsigned long address;		/* Faulting virtual address */
+	unsigned int flags;		/* FAULT_FLAG_xxx flags */
+	pmd_t *pmd;			/* Pointer to pmd entry matching
+					 * the 'address'
+					 */
+	pte_t *pte;			/* Pointer to pte entry matching
+					 * the 'address'. NULL if the page
+					 * table hasn't been allocated.
+					 */
+	spinlock_t *ptl;		/* Page table lock.
+					 * Protects pte page table if 'pte'
+					 * is not NULL, otherwise pmd.
+					 */
+	pgtable_t prealloc_pte;		/* Pre-allocated pte page table.
+					 * vm_ops->map_pages() calls
+					 * alloc_set_pte() from atomic context.
+					 * do_fault_around() pre-allocates
+					 * page table to avoid allocation from
+					 * atomic context.
+					 */
 };
 
 /*
@@ -327,7 +351,8 @@ struct vm_operations_struct {
 	int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
 	int (*pmd_fault)(struct vm_area_struct *, unsigned long address,
 						pmd_t *, unsigned int flags);
-	void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf);
+	void (*map_pages)(struct fault_env *fe,
+			pgoff_t start_pgoff, pgoff_t end_pgoff);
 
 	/* notification that a previously read-only page is about to become
 	 * writable, if an error is returned it will cause a SIGBUS */
@@ -537,7 +562,6 @@ void __put_page(struct page *page);
 void put_pages_list(struct list_head *pages);
 
 void split_page(struct page *page, unsigned int order);
-int split_free_page(struct page *page);
 
 /*
  * Compound pages have a destructor function.  Provide a
@@ -601,8 +625,8 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
 	return pte;
 }
 
-void do_set_pte(struct vm_area_struct *vma, unsigned long address,
-		struct page *page, pte_t *pte, bool write, bool anon);
+int alloc_set_pte(struct fault_env *fe, struct mem_cgroup *memcg,
+		struct page *page);
 #endif
 
 /*
@@ -909,6 +933,11 @@ static inline struct zone *page_zone(const struct page *page)
 	return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
 }
 
+static inline pg_data_t *page_pgdat(const struct page *page)
+{
+	return NODE_DATA(page_to_nid(page));
+}
+
 #ifdef SECTION_IN_PAGE_FLAGS
 static inline void set_page_section(struct page *page, unsigned long section)
 {
@@ -949,11 +978,21 @@ static inline struct mem_cgroup *page_memcg(struct page *page)
 {
 	return page->mem_cgroup;
 }
+static inline struct mem_cgroup *page_memcg_rcu(struct page *page)
+{
+	WARN_ON_ONCE(!rcu_read_lock_held());
+	return READ_ONCE(page->mem_cgroup);
+}
 #else
 static inline struct mem_cgroup *page_memcg(struct page *page)
 {
 	return NULL;
 }
+static inline struct mem_cgroup *page_memcg_rcu(struct page *page)
+{
+	WARN_ON_ONCE(!rcu_read_lock_held());
+	return NULL;
+}
 #endif
 
 /*
@@ -1035,6 +1074,7 @@ static inline pgoff_t page_file_index(struct page *page)
 }
 
 bool page_mapped(struct page *page);
+struct address_space *page_mapping(struct page *page);
 
 /*
  * Return true only if the page has been allocated with
@@ -1215,15 +1255,14 @@ int generic_error_remove_page(struct address_space *mapping, struct page *page);
 int invalidate_inode_page(struct page *page);
 
 #ifdef CONFIG_MMU
-extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
-			unsigned long address, unsigned int flags);
+extern int handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
+		unsigned int flags);
 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
 			    unsigned long address, unsigned int fault_flags,
 			    bool *unlocked);
 #else
-static inline int handle_mm_fault(struct mm_struct *mm,
-			struct vm_area_struct *vma, unsigned long address,
-			unsigned int flags)
+static inline int handle_mm_fault(struct vm_area_struct *vma,
+		unsigned long address, unsigned int flags)
 {
 	/* should never happen if there's no MMU */
 	BUG();
@@ -2086,7 +2125,8 @@ extern void truncate_inode_pages_final(struct address_space *);
 
 /* generic vm_area_ops exported for stackable file systems */
 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
-extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
+extern void filemap_map_pages(struct fault_env *fe,
+		pgoff_t start_pgoff, pgoff_t end_pgoff);
 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
 
 /* mm/page-writeback.c */
@@ -2282,13 +2322,14 @@ static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
 }
 #endif	/* __HAVE_ARCH_GATE_AREA */
 
+extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm);
+
 #ifdef CONFIG_SYSCTL
 extern int sysctl_drop_caches;
 int drop_caches_sysctl_handler(struct ctl_table *, int,
 					void __user *, size_t *, loff_t *);
 #endif
 
-void drop_pagecache(void);
 void drop_slab(void);
 void drop_slab_node(int nid);