Merge branch 'akpm' (patches from Andrew Morton)

Merge a bunch of fixes from Andrew Morton:
 "Commit 579f82901f6f ("swap: add a simple detector for inappropriate
  swapin readahead") is a feature.  No probs if you decide to defer it
  until the next merge window.

  It has been sitting in my tree for over a year because of my dislike
  of all the magic numbers, but recent discussion with Hugh has made me
  give up"

* emailed patches fron Andrew Morton <akpm@linux-foundation.org>:
  mm: __set_page_dirty uses spin_lock_irqsave instead of spin_lock_irq
  arch/x86/mm/numa.c: fix array index overflow when synchronizing nid to memblock.reserved.
  arch/x86/mm/numa.c: initialize numa_kernel_nodes in numa_clear_kernel_node_hotplug()
  mm: __set_page_dirty_nobuffers() uses spin_lock_irqsave() instead of spin_lock_irq()
  mm/swap: fix race on swap_info reuse between swapoff and swapon
  swap: add a simple detector for inappropriate swapin readahead
  ocfs2: free allocated clusters if error occurs after ocfs2_claim_clusters
  Documentation/kernel-parameters.txt: fix memmap= language

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index 651dba10b9c2..27265a8b43c1 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -654,14 +654,16 @@ EXPORT_SYMBOL(mark_buffer_dirty_inode);
 static void __set_page_dirty(struct page *page,
 		struct address_space *mapping, int warn)
 {
-	spin_lock_irq(&mapping->tree_lock);
+	unsigned long flags;
+
+	spin_lock_irqsave(&mapping->tree_lock, flags);
 	if (page->mapping) {	/* Race with truncate? */
 		WARN_ON_ONCE(warn && !PageUptodate(page));
 		account_page_dirtied(page, mapping);
 		radix_tree_tag_set(&mapping->page_tree,
 				page_index(page), PAGECACHE_TAG_DIRTY);
 	}
-	spin_unlock_irq(&mapping->tree_lock);
+	spin_unlock_irqrestore(&mapping->tree_lock, flags);
 	__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
 }