diff options
Diffstat (limited to 'mm/shmem.c')
| -rw-r--r-- | mm/shmem.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index be11c6dd414a..54287d443806 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1049,6 +1049,30 @@ static void shmem_evict_inode(struct inode *inode) clear_inode(inode); } +static unsigned long find_swap_entry(struct radix_tree_root *root, void *item) +{ + struct radix_tree_iter iter; + void **slot; + unsigned long found = -1; + unsigned int checked = 0; + + rcu_read_lock(); + radix_tree_for_each_slot(slot, root, &iter, 0) { + if (*slot == item) { + found = iter.index; + break; + } + checked++; + if ((checked % 4096) != 0) + continue; + slot = radix_tree_iter_resume(slot, &iter); + cond_resched_rcu(); + } + + rcu_read_unlock(); + return found; +} + /* * If swap found in inode, free it and move page from swapcache to filecache. */ @@ -1062,7 +1086,7 @@ static int shmem_unuse_inode(struct shmem_inode_info *info, int error = 0; radswap = swp_to_radix_entry(swap); - index = radix_tree_locate_item(&mapping->page_tree, radswap); + index = find_swap_entry(&mapping->page_tree, radswap); if (index == -1) return -EAGAIN; /* tell shmem_unuse we found nothing */ |