12 files changed, 64 insertions, 62 deletions

diff --git a/mm/Kconfig b/mm/Kconfig
index 1a4473fcb2ca..ae9ce6b73e8a 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -126,9 +126,11 @@ comment "Memory hotplug is currently incompatible with Software Suspend"
 # Default to 4 for wider testing, though 8 might be more appropriate.
 # ARM's adjust_pte (unused if VIPT) depends on mm-wide page_table_lock.
 # PA-RISC's debug spinlock_t is too large for the 32-bit struct page.
+# ARM26 and SPARC32 and PPC64 may use one page for multiple page tables.
 #
 config SPLIT_PTLOCK_CPUS
         int
         default "4096" if ARM && !CPU_CACHE_VIPT
         default "4096" if PARISC && DEBUG_SPINLOCK && !64BIT
+        default "4096" if ARM26 || SPARC32 || PPC64
         default "4"
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 9a565808da3f..728e9bda12ea 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -237,7 +237,6 @@ unsigned long hugetlb_total_pages(void)
 {
         return nr_huge_pages * (HPAGE_SIZE / PAGE_SIZE);
 }
-EXPORT_SYMBOL(hugetlb_total_pages);
 
 /*
  * We cannot handle pagefaults against hugetlb pages at all.  They cause
diff --git a/mm/mmap.c b/mm/mmap.c
index 320dda1778c3..6c997b159600 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -155,10 +155,6 @@ int __vm_enough_memory(long pages, int cap_sys_admin)
         return -ENOMEM;
 }
 
-EXPORT_SYMBOL(sysctl_overcommit_memory);
-EXPORT_SYMBOL(sysctl_overcommit_ratio);
-EXPORT_SYMBOL(sysctl_max_map_count);
-EXPORT_SYMBOL(vm_committed_space);
 EXPORT_SYMBOL(__vm_enough_memory);
 
 /*
diff --git a/mm/nommu.c b/mm/nommu.c
index d1e076a487cb..6deb6ab3d6ad 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -44,10 +44,6 @@ int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT;
 int heap_stack_gap = 0;
 
 EXPORT_SYMBOL(mem_map);
-EXPORT_SYMBOL(sysctl_max_map_count);
-EXPORT_SYMBOL(sysctl_overcommit_memory);
-EXPORT_SYMBOL(sysctl_overcommit_ratio);
-EXPORT_SYMBOL(vm_committed_space);
 EXPORT_SYMBOL(__vm_enough_memory);
 
 /* list of shareable VMAs */
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0166ea15c9ee..74138c9a22b9 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -750,7 +750,6 @@ int clear_page_dirty_for_io(struct page *page)
         }
         return TestClearPageDirty(page);
 }
-EXPORT_SYMBOL(clear_page_dirty_for_io);
 
 int test_clear_page_writeback(struct page *page)
 {
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2dbdd98426fd..ff81b5c65511 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -64,7 +64,6 @@ long nr_swap_pages;
 int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { 256, 32 };
 
 EXPORT_SYMBOL(totalram_pages);
-EXPORT_SYMBOL(nr_swap_pages);
 
 /*
  * Used by page_zone() to look up the address of the struct zone whose
diff --git a/mm/readahead.c b/mm/readahead.c
index d0b50034e245..72e7adbb87c7 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -254,7 +254,7 @@ out:
  */
 static int
 __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
-                        unsigned long offset, unsigned long nr_to_read)
+                        pgoff_t offset, unsigned long nr_to_read)
 {
         struct inode *inode = mapping->host;
         struct page *page;
@@ -274,7 +274,7 @@ __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
          */
         read_lock_irq(&mapping->tree_lock);
         for (page_idx = 0; page_idx < nr_to_read; page_idx++) {
-                unsigned long page_offset = offset + page_idx;
+                pgoff_t page_offset = offset + page_idx;
                 
                 if (page_offset > end_index)
                         break;
@@ -311,7 +311,7 @@ out:
  * memory at once.
  */
 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
-                unsigned long offset, unsigned long nr_to_read)
+                pgoff_t offset, unsigned long nr_to_read)
 {
         int ret = 0;
 
@@ -368,7 +368,7 @@ static inline int check_ra_success(struct file_ra_state *ra,
  * request queues.
  */
 int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
-                        unsigned long offset, unsigned long nr_to_read)
+                        pgoff_t offset, unsigned long nr_to_read)
 {
         if (bdi_read_congested(mapping->backing_dev_info))
                 return -1;
@@ -385,7 +385,7 @@ int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
  */
 static int
 blockable_page_cache_readahead(struct address_space *mapping, struct file *filp,
-                        unsigned long offset, unsigned long nr_to_read,
+                        pgoff_t offset, unsigned long nr_to_read,
                         struct file_ra_state *ra, int block)
 {
         int actual;
@@ -430,14 +430,27 @@ static int make_ahead_window(struct address_space *mapping, struct file *filp,
         return ret;
 }
 
-/*
- * page_cache_readahead is the main function.  If performs the adaptive
+/**
+ * page_cache_readahead - generic adaptive readahead
+ * @mapping: address_space which holds the pagecache and I/O vectors
+ * @ra: file_ra_state which holds the readahead state
+ * @filp: passed on to ->readpage() and ->readpages()
+ * @offset: start offset into @mapping, in PAGE_CACHE_SIZE units
+ * @req_size: hint: total size of the read which the caller is performing in
+ *            PAGE_CACHE_SIZE units
+ *
+ * page_cache_readahead() is the main function.  If performs the adaptive
  * readahead window size management and submits the readahead I/O.
+ *
+ * Note that @filp is purely used for passing on to the ->readpage[s]()
+ * handler: it may refer to a different file from @mapping (so we may not use
+ * @filp->f_mapping or @filp->f_dentry->d_inode here).
+ * Also, @ra may not be equal to &@filp->f_ra.
+ *
  */
 unsigned long
 page_cache_readahead(struct address_space *mapping, struct file_ra_state *ra,
-                     struct file *filp, unsigned long offset,
-                     unsigned long req_size)
+                     struct file *filp, pgoff_t offset, unsigned long req_size)
 {
         unsigned long max, newsize;
         int sequential;
diff --git a/mm/slab.c b/mm/slab.c
index 22bfb0b2ac8b..e291f5e1afbb 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -368,7 +368,7 @@ static inline void kmem_list3_init(struct kmem_list3 *parent)
  * manages a cache.
  */
         
-struct kmem_cache_s {
+struct kmem_cache {
 /* 1) per-cpu data, touched during every alloc/free */
         struct array_cache      *array[NR_CPUS];
         unsigned int            batchcount;
@@ -1502,6 +1502,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
 {
         size_t left_over, slab_size, ralign;
         kmem_cache_t *cachep = NULL;
+        struct list_head *p;
 
         /*
          * Sanity checks... these are all serious usage bugs.
@@ -1516,6 +1517,35 @@ kmem_cache_create (const char *name, size_t size, size_t align,
                         BUG();
                 }
 
+        down(&cache_chain_sem);
+
+        list_for_each(p, &cache_chain) {
+                kmem_cache_t *pc = list_entry(p, kmem_cache_t, next);
+                mm_segment_t old_fs = get_fs();
+                char tmp;
+                int res;
+
+                /*
+                 * This happens when the module gets unloaded and doesn't
+                 * destroy its slab cache and no-one else reuses the vmalloc
+                 * area of the module.  Print a warning.
+                 */
+                set_fs(KERNEL_DS);
+                res = __get_user(tmp, pc->name);
+                set_fs(old_fs);
+                if (res) {
+                        printk("SLAB: cache with size %d has lost its name\n",
+                                        pc->objsize);
+                        continue;
+                }
+
+                if (!strcmp(pc->name,name)) {
+                        printk("kmem_cache_create: duplicate cache %s\n", name);
+                        dump_stack();
+                        goto oops;
+                }
+        }
+
 #if DEBUG
         WARN_ON(strchr(name, ' '));     /* It confuses parsers */
         if ((flags & SLAB_DEBUG_INITIAL) && !ctor) {
@@ -1592,7 +1622,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
         /* Get cache's description obj. */
         cachep = (kmem_cache_t *) kmem_cache_alloc(&cache_cache, SLAB_KERNEL);
         if (!cachep)
-                goto opps;
+                goto oops;
         memset(cachep, 0, sizeof(kmem_cache_t));
 
 #if DEBUG
@@ -1686,7 +1716,7 @@ next:
                 printk("kmem_cache_create: couldn't create cache %s.\n", name);
                 kmem_cache_free(&cache_cache, cachep);
                 cachep = NULL;
-                goto opps;
+                goto oops;
         }
         slab_size = ALIGN(cachep->num*sizeof(kmem_bufctl_t)
                                 + sizeof(struct slab), align);
@@ -1781,43 +1811,14 @@ next:
                 cachep->limit = BOOT_CPUCACHE_ENTRIES;
         } 
 
-        /* Need the semaphore to access the chain. */
-        down(&cache_chain_sem);
-        {
-                struct list_head *p;
-                mm_segment_t old_fs;
-
-                old_fs = get_fs();
-                set_fs(KERNEL_DS);
-                list_for_each(p, &cache_chain) {
-                        kmem_cache_t *pc = list_entry(p, kmem_cache_t, next);
-                        char tmp;
-                        /* This happens when the module gets unloaded and doesn't
-                           destroy its slab cache and noone else reuses the vmalloc
-                           area of the module. Print a warning. */
-                        if (__get_user(tmp,pc->name)) { 
-                                printk("SLAB: cache with size %d has lost its name\n", 
-                                        pc->objsize); 
-                                continue; 
-                        }       
-                        if (!strcmp(pc->name,name)) { 
-                                printk("kmem_cache_create: duplicate cache %s\n",name); 
-                                up(&cache_chain_sem); 
-                                unlock_cpu_hotplug();
-                                BUG(); 
-                        }       
-                }
-                set_fs(old_fs);
-        }
-
         /* cache setup completed, link it into the list */
         list_add(&cachep->next, &cache_chain);
-        up(&cache_chain_sem);
         unlock_cpu_hotplug();
-opps:
+oops:
         if (!cachep && (flags & SLAB_PANIC))
                 panic("kmem_cache_create(): failed to create slab `%s'\n",
                         name);
+        up(&cache_chain_sem);
         return cachep;
 }
 EXPORT_SYMBOL(kmem_cache_create);
@@ -3262,6 +3263,7 @@ static void drain_array_locked(kmem_cache_t *cachep,
 
 /**
  * cache_reap - Reclaim memory from caches.
+ * @unused: unused parameter
  *
  * Called from workqueue/eventd every few seconds.
  * Purpose:
@@ -3278,7 +3280,7 @@ static void cache_reap(void *unused)
 
         if (down_trylock(&cache_chain_sem)) {
                 /* Give up. Setup the next iteration. */
-                schedule_delayed_work(&__get_cpu_var(reap_work), REAPTIMEOUT_CPUC + smp_processor_id());
+                schedule_delayed_work(&__get_cpu_var(reap_work), REAPTIMEOUT_CPUC);
                 return;
         }
 
@@ -3347,7 +3349,7 @@ next:
         up(&cache_chain_sem);
         drain_remote_pages();
         /* Setup the next iteration */
-        schedule_delayed_work(&__get_cpu_var(reap_work), REAPTIMEOUT_CPUC + smp_processor_id());
+        schedule_delayed_work(&__get_cpu_var(reap_work), REAPTIMEOUT_CPUC);
 }
 
 #ifdef CONFIG_PROC_FS
diff --git a/mm/swap.c b/mm/swap.c
index 154ae13d8b7e..d09cf7f03e76 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -413,7 +413,6 @@ void vm_acct_memory(long pages)
         }
         preempt_enable();
 }
-EXPORT_SYMBOL(vm_acct_memory);
 
 #ifdef CONFIG_HOTPLUG_CPU
 static void lru_drain_cache(unsigned int cpu)
diff --git a/mm/swap_state.c b/mm/swap_state.c
index dfd9a46755b8..0df9a57b1de8 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -40,7 +40,6 @@ struct address_space swapper_space = {
         .i_mmap_nonlinear = LIST_HEAD_INIT(swapper_space.i_mmap_nonlinear),
         .backing_dev_info = &swap_backing_dev_info,
 };
-EXPORT_SYMBOL(swapper_space);
 
 #define INC_CACHE_INFO(x)       do { swap_cache_info.x++; } while (0)
 
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 8970c0b74194..edafeace301f 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -36,8 +36,6 @@ unsigned int nr_swapfiles;
 long total_swap_pages;
 static int swap_overflow;
 
-EXPORT_SYMBOL(total_swap_pages);
-
 static const char Bad_file[] = "Bad swap file entry ";
 static const char Unused_file[] = "Unused swap file entry ";
 static const char Bad_offset[] = "Bad swap offset entry ";
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 54a90e83cb31..729eb3eec75f 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -457,7 +457,7 @@ void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask, pgprot_t prot)
  *      @size:          allocation size
  *      @gfp_mask:      flags for the page level allocator
  *      @prot:          protection mask for the allocated pages
- *      @node           node to use for allocation or -1
+ *      @node:          node to use for allocation or -1
  *
  *      Allocate enough pages to cover @size from the page level
  *      allocator with @gfp_mask flags.  Map them into contiguous
@@ -507,7 +507,7 @@ EXPORT_SYMBOL(vmalloc);
  *      vmalloc_node  -  allocate memory on a specific node
  *
  *      @size:          allocation size
- *      @node;          numa node
+ *      @node:          numa node
  *
  *      Allocate enough pages to cover @size from the page level
  *      allocator and map them into contiguous kernel virtual space.