diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/backing-dev.c | 34 | ||||
| -rw-r--r-- | mm/hugetlb.c | 5 | ||||
| -rw-r--r-- | mm/ksm.c | 12 | ||||
| -rw-r--r-- | mm/memcontrol.c | 4 | ||||
| -rw-r--r-- | mm/mmap.c | 3 | ||||
| -rw-r--r-- | mm/rmap.c | 9 |
6 files changed, 53 insertions, 14 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index f13e067..707d0dc 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -11,6 +11,8 @@ #include <linux/writeback.h> #include <linux/device.h> +static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); + void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) { } @@ -25,6 +27,11 @@ struct backing_dev_info default_backing_dev_info = { }; EXPORT_SYMBOL_GPL(default_backing_dev_info); +struct backing_dev_info noop_backing_dev_info = { + .name = "noop", +}; +EXPORT_SYMBOL_GPL(noop_backing_dev_info); + static struct class *bdi_class; /* @@ -715,6 +722,33 @@ void bdi_destroy(struct backing_dev_info *bdi) } EXPORT_SYMBOL(bdi_destroy); +/* + * For use from filesystems to quickly init and register a bdi associated + * with dirty writeback + */ +int bdi_setup_and_register(struct backing_dev_info *bdi, char *name, + unsigned int cap) +{ + char tmp[32]; + int err; + + bdi->name = name; + bdi->capabilities = cap; + err = bdi_init(bdi); + if (err) + return err; + + sprintf(tmp, "%.28s%s", name, "-%d"); + err = bdi_register(bdi, NULL, tmp, atomic_long_inc_return(&bdi_seq)); + if (err) { + bdi_destroy(bdi); + return err; + } + + return 0; +} +EXPORT_SYMBOL(bdi_setup_and_register); + static wait_queue_head_t congestion_wqh[2] = { __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[0]), __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1]) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 6034dc9..ffbdfc8 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -546,6 +546,7 @@ static void free_huge_page(struct page *page) mapping = (struct address_space *) page_private(page); set_page_private(page, 0); + page->mapping = NULL; BUG_ON(page_count(page)); INIT_LIST_HEAD(&page->lru); @@ -2447,8 +2448,10 @@ retry: spin_lock(&inode->i_lock); inode->i_blocks += blocks_per_huge_page(h); spin_unlock(&inode->i_lock); - } else + } else { lock_page(page); + page->mapping = HUGETLB_POISON; + } } /* @@ -365,7 +365,7 @@ static int break_ksm(struct vm_area_struct *vma, unsigned long addr) do { cond_resched(); page = follow_page(vma, addr, FOLL_GET); - if (!page) + if (IS_ERR_OR_NULL(page)) break; if (PageKsm(page)) ret = handle_mm_fault(vma->vm_mm, vma, addr, @@ -447,7 +447,7 @@ static struct page *get_mergeable_page(struct rmap_item *rmap_item) goto out; page = follow_page(vma, addr, FOLL_GET); - if (!page) + if (IS_ERR_OR_NULL(page)) goto out; if (PageAnon(page)) { flush_anon_page(vma, page, addr); @@ -1086,7 +1086,7 @@ struct rmap_item *unstable_tree_search_insert(struct rmap_item *rmap_item, cond_resched(); tree_rmap_item = rb_entry(*new, struct rmap_item, node); tree_page = get_mergeable_page(tree_rmap_item); - if (!tree_page) + if (IS_ERR_OR_NULL(tree_page)) return NULL; /* @@ -1294,7 +1294,7 @@ next_mm: if (ksm_test_exit(mm)) break; *page = follow_page(vma, ksm_scan.address, FOLL_GET); - if (*page && PageAnon(*page)) { + if (!IS_ERR_OR_NULL(*page) && PageAnon(*page)) { flush_anon_page(vma, *page, ksm_scan.address); flush_dcache_page(*page); rmap_item = get_next_rmap_item(slot, @@ -1308,7 +1308,7 @@ next_mm: up_read(&mm->mmap_sem); return rmap_item; } - if (*page) + if (!IS_ERR_OR_NULL(*page)) put_page(*page); ksm_scan.address += PAGE_SIZE; cond_resched(); @@ -1367,7 +1367,7 @@ next_mm: static void ksm_do_scan(unsigned int scan_npages) { struct rmap_item *rmap_item; - struct page *page; + struct page *uninitialized_var(page); while (scan_npages--) { cond_resched(); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index f4ede99..6c755de 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2429,11 +2429,11 @@ int mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr) } unlock_page_cgroup(pc); + *ptr = mem; if (mem) { - ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false); + ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, ptr, false); css_put(&mem->css); } - *ptr = mem; return ret; } @@ -1977,7 +1977,8 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma, return 0; /* Clean everything up if vma_adjust failed. */ - new->vm_ops->close(new); + if (new->vm_ops && new->vm_ops->close) + new->vm_ops->close(new); if (new->vm_file) { if (vma->vm_flags & VM_EXECUTABLE) removed_exe_file_vma(mm); @@ -133,8 +133,8 @@ int anon_vma_prepare(struct vm_area_struct *vma) goto out_enomem_free_avc; allocated = anon_vma; } - spin_lock(&anon_vma->lock); + spin_lock(&anon_vma->lock); /* page_table_lock to protect against threads */ spin_lock(&mm->page_table_lock); if (likely(!vma->anon_vma)) { @@ -144,14 +144,15 @@ int anon_vma_prepare(struct vm_area_struct *vma) list_add(&avc->same_vma, &vma->anon_vma_chain); list_add(&avc->same_anon_vma, &anon_vma->head); allocated = NULL; + avc = NULL; } spin_unlock(&mm->page_table_lock); - spin_unlock(&anon_vma->lock); - if (unlikely(allocated)) { + + if (unlikely(allocated)) anon_vma_free(allocated); + if (unlikely(avc)) anon_vma_chain_free(avc); - } } return 0; |