Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

12 files changed, 119 insertions, 71 deletions

diff --git a/mm/bootmem.c b/mm/bootmem.c
index d213feded10d..50353e0dac12 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -29,9 +29,7 @@ unsigned long max_low_pfn;
 unsigned long min_low_pfn;
 unsigned long max_pfn;
 
-EXPORT_SYMBOL(max_pfn);         /* This is exported so
-                                 * dma_get_required_mask(), which uses
-                                 * it, can be an inline function */
+EXPORT_UNUSED_SYMBOL(max_pfn);  /*  June 2006  */
 
 static LIST_HEAD(bdata_list);
 #ifdef CONFIG_CRASH_DUMP
diff --git a/mm/fadvise.c b/mm/fadvise.c
index 0a03357a1f8e..168c78a121bb 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -23,18 +23,6 @@
 /*
  * POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
  * deactivate the pages and clear PG_Referenced.
- *
- * LINUX_FADV_ASYNC_WRITE: start async writeout of any dirty pages between file
- * offsets `offset' and `offset+len' inclusive.  Any pages which are currently
- * under writeout are skipped, whether or not they are dirty.
- *
- * LINUX_FADV_WRITE_WAIT: wait upon writeout of any dirty pages between file
- * offsets `offset' and `offset+len'.
- *
- * By combining these two operations the application may do several things:
- *
- * LINUX_FADV_ASYNC_WRITE: push some or all of the dirty pages at the disk.
- *
  */
 asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice)
 {
@@ -85,7 +73,6 @@ asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice)
                 file->f_ra.ra_pages = bdi->ra_pages * 2;
                 break;
         case POSIX_FADV_WILLNEED:
-        case POSIX_FADV_NOREUSE:
                 if (!mapping->a_ops->readpage) {
                         ret = -EINVAL;
                         break;
@@ -106,6 +93,8 @@ asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice)
                 if (ret > 0)
                         ret = 0;
                 break;
+        case POSIX_FADV_NOREUSE:
+                break;
         case POSIX_FADV_DONTNEED:
                 if (!bdi_write_congested(mapping->backing_dev_info))
                         filemap_flush(mapping);
diff --git a/mm/filemap.c b/mm/filemap.c
index d087fc3d3281..b9a60c43b61a 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -849,8 +849,6 @@ static void shrink_readahead_size_eio(struct file *filp,
                 return;
 
         ra->ra_pages /= 4;
-        printk(KERN_WARNING "Reducing readahead size to %luK\n",
-                        ra->ra_pages << (PAGE_CACHE_SHIFT - 10));
 }
 
 /**
diff --git a/mm/memory.c b/mm/memory.c
index c1e14c9e67e4..109e9866237e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -47,6 +47,7 @@
 #include <linux/pagemap.h>
 #include <linux/rmap.h>
 #include <linux/module.h>
+#include <linux/delayacct.h>
 #include <linux/init.h>
 
 #include <asm/pgalloc.h>
@@ -1549,9 +1550,9 @@ gotten:
                 flush_cache_page(vma, address, pte_pfn(orig_pte));
                 entry = mk_pte(new_page, vma->vm_page_prot);
                 entry = maybe_mkwrite(pte_mkdirty(entry), vma);
+                lazy_mmu_prot_update(entry);
                 ptep_establish(vma, address, page_table, entry);
                 update_mmu_cache(vma, address, entry);
-                lazy_mmu_prot_update(entry);
                 lru_cache_add_active(new_page);
                 page_add_new_anon_rmap(new_page, vma, address);
 
@@ -1853,7 +1854,7 @@ int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end)
 
         return 0;
 }
-EXPORT_SYMBOL(vmtruncate_range);
+EXPORT_UNUSED_SYMBOL(vmtruncate_range);  /*  June 2006  */
 
 /* 
  * Primitive swap readahead code. We simply read an aligned block of
@@ -1934,6 +1935,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
                 migration_entry_wait(mm, pmd, address);
                 goto out;
         }
+        delayacct_set_flag(DELAYACCT_PF_SWAPIN);
         page = lookup_swap_cache(entry);
         if (!page) {
                 swapin_readahead(entry, address, vma);
@@ -1946,6 +1948,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
                         page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
                         if (likely(pte_same(*page_table, orig_pte)))
                                 ret = VM_FAULT_OOM;
+                        delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
                         goto unlock;
                 }
 
@@ -1955,6 +1958,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
                 grab_swap_token();
         }
 
+        delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
         mark_page_accessed(page);
         lock_page(page);
 
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 01c9fb97c619..c37319542b70 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -52,6 +52,9 @@ static int __add_section(struct zone *zone, unsigned long phys_start_pfn)
         int nr_pages = PAGES_PER_SECTION;
         int ret;
 
+        if (pfn_valid(phys_start_pfn))
+                return -EEXIST;
+
         ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages);
 
         if (ret < 0)
@@ -76,15 +79,22 @@ int __add_pages(struct zone *zone, unsigned long phys_start_pfn,
 {
         unsigned long i;
         int err = 0;
+        int start_sec, end_sec;
+        /* during initialize mem_map, align hot-added range to section */
+        start_sec = pfn_to_section_nr(phys_start_pfn);
+        end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1);
 
-        for (i = 0; i < nr_pages; i += PAGES_PER_SECTION) {
-                err = __add_section(zone, phys_start_pfn + i);
+        for (i = start_sec; i <= end_sec; i++) {
+                err = __add_section(zone, i << PFN_SECTION_SHIFT);
 
-                /* We want to keep adding the rest of the
-                 * sections if the first ones already exist
+                /*
+                 * EEXIST is finally dealed with by ioresource collision
+                 * check. see add_memory() => register_memory_resource()
+                 * Warning will be printed if there is collision.
                  */
                 if (err && (err != -EEXIST))
                         break;
+                err = 0;
         }
 
         return err;
@@ -156,7 +166,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
         res.flags = IORESOURCE_MEM; /* we just need system ram */
         section_end = res.end;
 
-        while (find_next_system_ram(&res) >= 0) {
+        while ((res.start < res.end) && (find_next_system_ram(&res) >= 0)) {
                 start_pfn = (unsigned long)(res.start >> PAGE_SHIFT);
                 nr_pages = (unsigned long)
                            ((res.end + 1 - res.start) >> PAGE_SHIFT);
@@ -213,10 +223,9 @@ static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
 }
 
 /* add this memory to iomem resource */
-static void register_memory_resource(u64 start, u64 size)
+static struct resource *register_memory_resource(u64 start, u64 size)
 {
         struct resource *res;
-
         res = kzalloc(sizeof(struct resource), GFP_KERNEL);
         BUG_ON(!res);
 
@@ -228,7 +237,18 @@ static void register_memory_resource(u64 start, u64 size)
                 printk("System RAM resource %llx - %llx cannot be added\n",
                 (unsigned long long)res->start, (unsigned long long)res->end);
                 kfree(res);
+                res = NULL;
         }
+        return res;
+}
+
+static void release_memory_resource(struct resource *res)
+{
+        if (!res)
+                return;
+        release_resource(res);
+        kfree(res);
+        return;
 }
 
 
@@ -237,8 +257,13 @@ int add_memory(int nid, u64 start, u64 size)
 {
         pg_data_t *pgdat = NULL;
         int new_pgdat = 0;
+        struct resource *res;
         int ret;
 
+        res = register_memory_resource(start, size);
+        if (!res)
+                return -EEXIST;
+
         if (!node_online(nid)) {
                 pgdat = hotadd_new_pgdat(nid, start);
                 if (!pgdat)
@@ -268,14 +293,13 @@ int add_memory(int nid, u64 start, u64 size)
                 BUG_ON(ret);
         }
 
-        /* register this memory as resource */
-        register_memory_resource(start, size);
-
         return ret;
 error:
         /* rollback pgdat allocation and others */
         if (new_pgdat)
                 rollback_node_hotadd(nid, pgdat);
+        if (res)
+                release_memory_resource(res);
 
         return ret;
 }
diff --git a/mm/mmzone.c b/mm/mmzone.c
index 0959ee1a4795..febea1c98168 100644
--- a/mm/mmzone.c
+++ b/mm/mmzone.c
@@ -14,7 +14,7 @@ struct pglist_data *first_online_pgdat(void)
         return NODE_DATA(first_online_node);
 }
 
-EXPORT_SYMBOL(first_online_pgdat);
+EXPORT_UNUSED_SYMBOL(first_online_pgdat);  /*  June 2006  */
 
 struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
 {
@@ -24,7 +24,7 @@ struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
                 return NULL;
         return NODE_DATA(nid);
 }
-EXPORT_SYMBOL(next_online_pgdat);
+EXPORT_UNUSED_SYMBOL(next_online_pgdat);  /*  June 2006  */
 
 
 /*
@@ -45,5 +45,5 @@ struct zone *next_zone(struct zone *zone)
         }
         return zone;
 }
-EXPORT_SYMBOL(next_zone);
+EXPORT_UNUSED_SYMBOL(next_zone);  /*  June 2006  */
 
diff --git a/mm/nommu.c b/mm/nommu.c
index 5151c44a8257..c576df71e3bb 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1070,6 +1070,7 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
         vma->vm_start = vma->vm_pgoff << PAGE_SHIFT;
         return 0;
 }
+EXPORT_SYMBOL(remap_pfn_range);
 
 void swap_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
 {
@@ -1090,6 +1091,7 @@ void unmap_mapping_range(struct address_space *mapping,
                          int even_cows)
 {
 }
+EXPORT_SYMBOL(unmap_mapping_range);
 
 /*
  * Check that a process has enough memory to allocate a new virtual
diff --git a/mm/slab.c b/mm/slab.c
index 85c2e03098a7..21ba06035700 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -674,6 +674,37 @@ static struct kmem_cache cache_cache = {
 #endif
 };
 
+#ifdef CONFIG_LOCKDEP
+
+/*
+ * Slab sometimes uses the kmalloc slabs to store the slab headers
+ * for other slabs "off slab".
+ * The locking for this is tricky in that it nests within the locks
+ * of all other slabs in a few places; to deal with this special
+ * locking we put on-slab caches into a separate lock-class.
+ */
+static struct lock_class_key on_slab_key;
+
+static inline void init_lock_keys(struct cache_sizes *s)
+{
+        int q;
+
+        for (q = 0; q < MAX_NUMNODES; q++) {
+                if (!s->cs_cachep->nodelists[q] || OFF_SLAB(s->cs_cachep))
+                        continue;
+                lockdep_set_class(&s->cs_cachep->nodelists[q]->list_lock,
+                                  &on_slab_key);
+        }
+}
+
+#else
+static inline void init_lock_keys(struct cache_sizes *s)
+{
+}
+#endif
+
+
+
 /* Guard access to the cache-chain. */
 static DEFINE_MUTEX(cache_chain_mutex);
 static struct list_head cache_chain;
@@ -1021,8 +1052,7 @@ static void drain_alien_cache(struct kmem_cache *cachep,
         }
 }
 
-static inline int cache_free_alien(struct kmem_cache *cachep, void *objp,
-                                   int nesting)
+static inline int cache_free_alien(struct kmem_cache *cachep, void *objp)
 {
         struct slab *slabp = virt_to_slab(objp);
         int nodeid = slabp->nodeid;
@@ -1040,7 +1070,7 @@ static inline int cache_free_alien(struct kmem_cache *cachep, void *objp,
         STATS_INC_NODEFREES(cachep);
         if (l3->alien && l3->alien[nodeid]) {
                 alien = l3->alien[nodeid];
-                spin_lock_nested(&alien->lock, nesting);
+                spin_lock(&alien->lock);
                 if (unlikely(alien->avail == alien->limit)) {
                         STATS_INC_ACOVERFLOW(cachep);
                         __drain_alien_cache(cachep, alien, nodeid);
@@ -1069,15 +1099,14 @@ static inline void free_alien_cache(struct array_cache **ac_ptr)
 {
 }
 
-static inline int cache_free_alien(struct kmem_cache *cachep, void *objp,
-                                   int nesting)
+static inline int cache_free_alien(struct kmem_cache *cachep, void *objp)
 {
         return 0;
 }
 
 #endif
 
-static int __devinit cpuup_callback(struct notifier_block *nfb,
+static int __cpuinit cpuup_callback(struct notifier_block *nfb,
                                     unsigned long action, void *hcpu)
 {
         long cpu = (long)hcpu;
@@ -1393,6 +1422,7 @@ void __init kmem_cache_init(void)
                                         ARCH_KMALLOC_FLAGS|SLAB_PANIC,
                                         NULL, NULL);
                 }
+                init_lock_keys(sizes);
 
                 sizes->cs_dmacachep = kmem_cache_create(names->name_dma,
                                         sizes->cs_size,
@@ -1760,8 +1790,6 @@ static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp)
 }
 #endif
 
-static void __cache_free(struct kmem_cache *cachep, void *objp, int nesting);
-
 /**
  * slab_destroy - destroy and release all objects in a slab
  * @cachep: cache pointer being destroyed
@@ -1785,17 +1813,8 @@ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp)
                 call_rcu(&slab_rcu->head, kmem_rcu_free);
         } else {
                 kmem_freepages(cachep, addr);
-                if (OFF_SLAB(cachep)) {
-                        unsigned long flags;
-
-                        /*
-                         * lockdep: we may nest inside an already held
-                         * ac->lock, so pass in a nesting flag:
-                         */
-                        local_irq_save(flags);
-                        __cache_free(cachep->slabp_cache, slabp, 1);
-                        local_irq_restore(flags);
-                }
+                if (OFF_SLAB(cachep))
+                        kmem_cache_free(cachep->slabp_cache, slabp);
         }
 }
 
@@ -3100,16 +3119,7 @@ static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects,
                 if (slabp->inuse == 0) {
                         if (l3->free_objects > l3->free_limit) {
                                 l3->free_objects -= cachep->num;
-                                /*
-                                 * It is safe to drop the lock. The slab is
-                                 * no longer linked to the cache. cachep
-                                 * cannot disappear - we are using it and
-                                 * all destruction of caches must be
-                                 * serialized properly by the user.
-                                 */
-                                spin_unlock(&l3->list_lock);
                                 slab_destroy(cachep, slabp);
-                                spin_lock(&l3->list_lock);
                         } else {
                                 list_add(&slabp->list, &l3->slabs_free);
                         }
@@ -3135,7 +3145,7 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac)
 #endif
         check_irq_off();
         l3 = cachep->nodelists[node];
-        spin_lock_nested(&l3->list_lock, SINGLE_DEPTH_NESTING);
+        spin_lock(&l3->list_lock);
         if (l3->shared) {
                 struct array_cache *shared_array = l3->shared;
                 int max = shared_array->limit - shared_array->avail;
@@ -3178,14 +3188,14 @@ free_done:
  * Release an obj back to its cache. If the obj has a constructed state, it must
  * be in this state _before_ it is released.  Called with disabled ints.
  */
-static void __cache_free(struct kmem_cache *cachep, void *objp, int nesting)
+static inline void __cache_free(struct kmem_cache *cachep, void *objp)
 {
         struct array_cache *ac = cpu_cache_get(cachep);
 
         check_irq_off();
         objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0));
 
-        if (cache_free_alien(cachep, objp, nesting))
+        if (cache_free_alien(cachep, objp))
                 return;
 
         if (likely(ac->avail < ac->limit)) {
@@ -3214,7 +3224,7 @@ void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
 EXPORT_SYMBOL(kmem_cache_alloc);
 
 /**
- * kmem_cache_alloc - Allocate an object. The memory is set to zero.
+ * kmem_cache_zalloc - Allocate an object. The memory is set to zero.
  * @cache: The cache to allocate from.
  * @flags: See kmalloc().
  *
@@ -3424,7 +3434,7 @@ void kmem_cache_free(struct kmem_cache *cachep, void *objp)
         BUG_ON(virt_to_cache(objp) != cachep);
 
         local_irq_save(flags);
-        __cache_free(cachep, objp, 0);
+        __cache_free(cachep, objp);
         local_irq_restore(flags);
 }
 EXPORT_SYMBOL(kmem_cache_free);
@@ -3449,7 +3459,7 @@ void kfree(const void *objp)
         kfree_debugcheck(objp);
         c = virt_to_cache(objp);
         debug_check_no_locks_freed(objp, obj_size(c));
-        __cache_free(c, (void *)objp, 0);
+        __cache_free(c, (void *)objp);
         local_irq_restore(flags);
 }
 EXPORT_SYMBOL(kfree);
diff --git a/mm/swap.c b/mm/swap.c
index 8fd095c4ae51..687686a61f7c 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -54,6 +54,26 @@ void put_page(struct page *page)
 }
 EXPORT_SYMBOL(put_page);
 
+/**
+ * put_pages_list(): release a list of pages
+ *
+ * Release a list of pages which are strung together on page.lru.  Currently
+ * used by read_cache_pages() and related error recovery code.
+ *
+ * @pages: list of pages threaded on page->lru
+ */
+void put_pages_list(struct list_head *pages)
+{
+        while (!list_empty(pages)) {
+                struct page *victim;
+
+                victim = list_entry(pages->prev, struct page, lru);
+                list_del(&victim->lru);
+                page_cache_release(victim);
+        }
+}
+EXPORT_SYMBOL(put_pages_list);
+
 /*
  * Writeback is about to end against a page which has been marked for immediate
  * reclaim.  If it still appears to be reclaimable, move it to the tail of the
diff --git a/mm/swapfile.c b/mm/swapfile.c
index e70d6c6d6fee..f1f5ec783781 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -442,11 +442,12 @@ int swap_type_of(dev_t device)
 
                 if (!(swap_info[i].flags & SWP_WRITEOK))
                         continue;
+
                 if (!device) {
                         spin_unlock(&swap_lock);
                         return i;
                 }
-                inode = swap_info->swap_file->f_dentry->d_inode;
+                inode = swap_info[i].swap_file->f_dentry->d_inode;
                 if (S_ISBLK(inode->i_mode) &&
                     device == MKDEV(imajor(inode), iminor(inode))) {
                         spin_unlock(&swap_lock);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 7b450798b458..266162d2ba28 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -340,7 +340,7 @@ void __vunmap(void *addr, int deallocate_pages)
                         __free_page(area->pages[i]);
                 }
 
-                if (area->nr_pages > PAGE_SIZE/sizeof(struct page *))
+                if (area->flags & VM_VPAGES)
                         vfree(area->pages);
                 else
                         kfree(area->pages);
@@ -427,9 +427,10 @@ void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 
         area->nr_pages = nr_pages;
         /* Please note that the recursion is strictly bounded. */
-        if (array_size > PAGE_SIZE)
+        if (array_size > PAGE_SIZE) {
                 pages = __vmalloc_node(array_size, gfp_mask, PAGE_KERNEL, node);
-        else
+                area->flags |= VM_VPAGES;
+        } else
                 pages = kmalloc_node(array_size, (gfp_mask & ~__GFP_HIGHMEM), node);
         area->pages = pages;
         if (!area->pages) {
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 73b83d67bab6..dfdf24133901 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -81,6 +81,7 @@ void all_vm_events(unsigned long *ret)
 {
         sum_vm_events(ret, &cpu_online_map);
 }
+EXPORT_SYMBOL_GPL(all_vm_events);
 
 #ifdef CONFIG_HOTPLUG
 /*