1 files changed, 85 insertions, 27 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index a06a84d347fb..85854b867463 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3,6 +3,7 @@
 
 #include <linux/sched.h>
 #include <linux/errno.h>
+#include <linux/capability.h>
 
 #ifdef __KERNEL__
 
@@ -13,6 +14,7 @@
 #include <linux/rbtree.h>
 #include <linux/prio_tree.h>
 #include <linux/fs.h>
+#include <linux/mutex.h>
 
 struct mempolicy;
 struct anon_vma;
@@ -223,24 +225,27 @@ struct page {
                                          * & limit reverse map searches.
                                          */
         union {
-                unsigned long private;  /* Mapping-private opaque data:
-                                         * usually used for buffer_heads
-                                         * if PagePrivate set; used for
-                                         * swp_entry_t if PageSwapCache
-                                         * When page is free, this indicates
-                                         * order in the buddy system.
-                                         */
+            struct {
+                unsigned long private;          /* Mapping-private opaque data:
+                                                 * usually used for buffer_heads
+                                                 * if PagePrivate set; used for
+                                                 * swp_entry_t if PageSwapCache.
+                                                 * When page is free, this
+                                                 * indicates order in the buddy
+                                                 * system.
+                                                 */
+                struct address_space *mapping;  /* If low bit clear, points to
+                                                 * inode address_space, or NULL.
+                                                 * If page mapped as anonymous
+                                                 * memory, low bit is set, and
+                                                 * it points to anon_vma object:
+                                                 * see PAGE_MAPPING_ANON below.
+                                                 */
+            };
 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
-                spinlock_t ptl;
+            spinlock_t ptl;
 #endif
-        } u;
-        struct address_space *mapping;  /* If low bit clear, points to
-                                         * inode address_space, or NULL.
-                                         * If page mapped as anonymous
-                                         * memory, low bit is set, and
-                                         * it points to anon_vma object:
-                                         * see PAGE_MAPPING_ANON below.
-                                         */
+        };
         pgoff_t index;                  /* Our offset within mapping. */
         struct list_head lru;           /* Pageout list, eg. active_list
                                          * protected by zone->lru_lock !
@@ -261,8 +266,8 @@ struct page {
 #endif /* WANT_PAGE_VIRTUAL */
 };
 
-#define page_private(page)              ((page)->u.private)
-#define set_page_private(page, v)       ((page)->u.private = (v))
+#define page_private(page)              ((page)->private)
+#define set_page_private(page, v)       ((page)->private = (v))
 
 /*
  * FIXME: take this include out, include page-flags.h in
@@ -308,7 +313,7 @@ struct page {
  */
 #define get_page_testone(p)     atomic_inc_and_test(&(p)->_count)
 
-#define set_page_count(p,v)     atomic_set(&(p)->_count, v - 1)
+#define set_page_count(p,v)     atomic_set(&(p)->_count, (v) - 1)
 #define __put_page(p)           atomic_dec(&(p)->_count)
 
 extern void FASTCALL(__page_cache_release(struct page *));
@@ -507,7 +512,7 @@ static inline void set_page_links(struct page *page, unsigned long zone,
 extern struct page *mem_map;
 #endif
 
-static inline void *lowmem_page_address(struct page *page)
+static __always_inline void *lowmem_page_address(struct page *page)
 {
         return __va(page_to_pfn(page) << PAGE_SHIFT);
 }
@@ -634,14 +639,38 @@ struct mempolicy *shmem_get_policy(struct vm_area_struct *vma,
 int shmem_lock(struct file *file, int lock, struct user_struct *user);
 #else
 #define shmem_nopage filemap_nopage
-#define shmem_lock(a, b, c)     ({0;})  /* always in memory, no need to lock */
-#define shmem_set_policy(a, b)  (0)
-#define shmem_get_policy(a, b)  (NULL)
+
+static inline int shmem_lock(struct file *file, int lock,
+                             struct user_struct *user)
+{
+        return 0;
+}
+
+static inline int shmem_set_policy(struct vm_area_struct *vma,
+                                   struct mempolicy *new)
+{
+        return 0;
+}
+
+static inline struct mempolicy *shmem_get_policy(struct vm_area_struct *vma,
+                                                 unsigned long addr)
+{
+        return NULL;
+}
 #endif
 struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags);
+extern int shmem_mmap(struct file *file, struct vm_area_struct *vma);
 
 int shmem_zero_setup(struct vm_area_struct *);
 
+#ifndef CONFIG_MMU
+extern unsigned long shmem_get_unmapped_area(struct file *file,
+                                             unsigned long addr,
+                                             unsigned long len,
+                                             unsigned long pgoff,
+                                             unsigned long flags);
+#endif
+
 static inline int can_do_mlock(void)
 {
         if (capable(CAP_IPC_LOCK))
@@ -690,14 +719,31 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping,
 }
 
 extern int vmtruncate(struct inode * inode, loff_t offset);
+extern int vmtruncate_range(struct inode * inode, loff_t offset, loff_t end);
 extern int install_page(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, struct page *page, pgprot_t prot);
 extern int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, unsigned long pgoff, pgprot_t prot);
-extern int __handle_mm_fault(struct mm_struct *mm,struct vm_area_struct *vma, unsigned long address, int write_access);
 
-static inline int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, int write_access)
+#ifdef CONFIG_MMU
+extern int __handle_mm_fault(struct mm_struct *mm,struct vm_area_struct *vma,
+                        unsigned long address, int write_access);
+
+static inline int handle_mm_fault(struct mm_struct *mm,
+                        struct vm_area_struct *vma, unsigned long address,
+                        int write_access)
 {
-        return __handle_mm_fault(mm, vma, address, write_access) & (~VM_FAULT_WRITE);
+        return __handle_mm_fault(mm, vma, address, write_access) &
+                                (~VM_FAULT_WRITE);
 }
+#else
+static inline int handle_mm_fault(struct mm_struct *mm,
+                        struct vm_area_struct *vma, unsigned long address,
+                        int write_access)
+{
+        /* should never happen if there's no MMU */
+        BUG();
+        return VM_FAULT_SIGBUS;
+}
+#endif
 
 extern int make_pages_present(unsigned long addr, unsigned long end);
 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
@@ -774,7 +820,7 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
  * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
  * When freeing, reset page->mapping so free_pages_check won't complain.
  */
-#define __pte_lockptr(page)     &((page)->u.ptl)
+#define __pte_lockptr(page)     &((page)->ptl)
 #define pte_lock_init(_page)    do {                                    \
         spin_lock_init(__pte_lockptr(_page));                           \
 } while (0)
@@ -896,6 +942,8 @@ extern unsigned long do_brk(unsigned long, unsigned long);
 /* filemap.c */
 extern unsigned long page_unuse(struct page *);
 extern void truncate_inode_pages(struct address_space *, loff_t);
+extern void truncate_inode_pages_range(struct address_space *,
+                                       loff_t lstart, loff_t lend);
 
 /* generic vm_area_ops exported for stackable file systems */
 extern struct page *filemap_nopage(struct vm_area_struct *, unsigned long, int *);
@@ -978,6 +1026,9 @@ static inline void vm_stat_account(struct mm_struct *mm,
 static inline void
 kernel_map_pages(struct page *page, int numpages, int enable)
 {
+        if (!PageHighMem(page) && !enable)
+                mutex_debug_check_no_locks_freed(page_address(page),
+                                                 numpages * PAGE_SIZE);
 }
 #endif
 
@@ -993,5 +1044,12 @@ int in_gate_area_no_task(unsigned long addr);
 /* /proc/<pid>/oom_adj set to -17 protects from the oom-killer */
 #define OOM_DISABLE -17
 
+int drop_caches_sysctl_handler(struct ctl_table *, int, struct file *,
+                                        void __user *, size_t *, loff_t *);
+int shrink_slab(unsigned long scanned, gfp_t gfp_mask,
+                        unsigned long lru_pages);
+void drop_pagecache(void);
+void drop_slab(void);
+
 #endif /* __KERNEL__ */
 #endif /* _LINUX_MM_H */