Use mutex instead of semaphore in CAPI 2.0 driver

[linux.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8c149fa4491d751bd70997b024d220a5a139f8d4..a5c451816fdca003350570aa3139e2f32fbe45f9 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1,9 +1,7 @@
 #ifndef _LINUX_MM_H
 #define _LINUX_MM_H
 
-#include <linux/sched.h>
 #include <linux/errno.h>
-#include <linux/capability.h>
 
 #ifdef __KERNEL__
 
@@ -20,6 +18,7 @@
 
 struct mempolicy;
 struct anon_vma;
+struct user_struct;
 
 #ifndef CONFIG_DISCONTIGMEM          /* Don't use mapnrs, do it properly */
 extern unsigned long max_mapnr;
@@ -27,7 +26,6 @@ extern unsigned long max_mapnr;
 
 extern unsigned long num_physpages;
 extern void * high_memory;
-extern unsigned long vmalloc_earlyreserve;
 extern int page_cluster;
 
 #ifdef CONFIG_SYSCTL
@@ -269,14 +267,7 @@ static inline int get_page_unless_zero(struct page *page)
 
 static inline struct page *compound_head(struct page *page)
 {
-       /*
-        * We could avoid the PageCompound(page) check if
-        * we would not overload PageTail().
-        *
-        * This check has to be done in several performance critical
-        * paths of the slab etc. IMHO PageTail deserves its own flag.
-        */
-       if (unlikely(PageCompound(page) && PageTail(page)))
+       if (unlikely(PageTail(page)))
                return page->first_page;
        return page;
 }
@@ -293,6 +284,12 @@ static inline void get_page(struct page *page)
        atomic_inc(&page->_count);
 }
 
+static inline struct page *virt_to_head_page(const void *x)
+{
+       struct page *page = virt_to_page(x);
+       return compound_head(page);
+}
+
 /*
  * Setup the page count before being freed into the page allocator for
  * the first time (boot or memory hotplug)
@@ -327,7 +324,7 @@ static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
 
 static inline int compound_order(struct page *page)
 {
-       if (!PageCompound(page) || PageTail(page))
+       if (!PageHead(page))
                return 0;
        return (unsigned long)page[1].lru.prev;
 }
@@ -602,8 +599,13 @@ static inline struct address_space *page_mapping(struct page *page)
 {
        struct address_space *mapping = page->mapping;
 
+       VM_BUG_ON(PageSlab(page));
        if (unlikely(PageSwapCache(page)))
                mapping = &swapper_space;
+#ifdef CONFIG_SLUB
+       else if (unlikely(PageSlab(page)))
+               mapping = NULL;
+#endif
        else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
                mapping = NULL;
        return mapping;
@@ -718,14 +720,7 @@ extern unsigned long shmem_get_unmapped_area(struct file *file,
                                             unsigned long flags);
 #endif
 
-static inline int can_do_mlock(void)
-{
-       if (capable(CAP_IPC_LOCK))
-               return 1;
-       if (current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur != 0)
-               return 1;
-       return 0;
-}
+extern int can_do_mlock(void);
 extern int user_shm_lock(size_t, struct user_struct *);
 extern void user_shm_unlock(size_t, struct user_struct *);
 
@@ -816,27 +811,31 @@ extern unsigned long do_mremap(unsigned long addr,
                               unsigned long flags, unsigned long new_addr);
 
 /*
- * Prototype to add a shrinker callback for ageable caches.
- * 
- * These functions are passed a count `nr_to_scan' and a gfpmask.  They should
- * scan `nr_to_scan' objects, attempting to free them.
+ * A callback you can register to apply pressure to ageable caches.
  *
- * The callback must return the number of objects which remain in the cache.
+ * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'.  It should
+ * look through the least-recently-used 'nr_to_scan' entries and
+ * attempt to free them up.  It should return the number of objects
+ * which remain in the cache.  If it returns -1, it means it cannot do
+ * any scanning at this time (eg. there is a risk of deadlock).
  *
- * The callback will be passed nr_to_scan == 0 when the VM is querying the
- * cache size, so a fastpath for that case is appropriate.
- */
-typedef int (*shrinker_t)(int nr_to_scan, gfp_t gfp_mask);
-
-/*
- * Add an aging callback.  The int is the number of 'seeks' it takes
- * to recreate one of the objects that these functions age.
+ * The 'gfpmask' refers to the allocation we are currently trying to
+ * fulfil.
+ *
+ * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is
+ * querying the cache size, so a fastpath for that case is appropriate.
  */
+struct shrinker {
+       int (*shrink)(int nr_to_scan, gfp_t gfp_mask);
+       int seeks;      /* seeks to recreate an obj */
 
-#define DEFAULT_SEEKS 2
-struct shrinker;
-extern struct shrinker *set_shrinker(int, shrinker_t);
-extern void remove_shrinker(struct shrinker *shrinker);
+       /* These are for internal use */
+       struct list_head list;
+       long nr;        /* objs pending delete */
+};
+#define DEFAULT_SEEKS 2 /* A good number if you don't know better. */
+extern void register_shrinker(struct shrinker *);
+extern void unregister_shrinker(struct shrinker *);
 
 /*
  * Some shared mappigns will want the pages marked read-only
@@ -1076,6 +1075,10 @@ extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned lo
 extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
        unsigned long len, unsigned long prot,
        unsigned long flag, unsigned long pgoff);
+extern unsigned long mmap_region(struct file *file, unsigned long addr,
+       unsigned long len, unsigned long flags,
+       unsigned int vm_flags, unsigned long pgoff,
+       int accountable);
 
 static inline unsigned long do_mmap(struct file *file, unsigned long addr,
        unsigned long len, unsigned long prot,