[PATCH 05/10] don't use spin_lock_irqsave() unnecessarily

[Kent Overstreet]

Signed-off-by: Kent Overstreet <kent.overstr...@gmail.com>
---
 mm/page-writeback.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 586f31261c..17ccc294c9 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2460,20 +2460,19 @@ int __set_page_dirty_nobuffers(struct page *page)
        lock_page_memcg(page);
        if (!TestSetPageDirty(page)) {
                struct address_space *mapping = page_mapping(page);
-               unsigned long flags;
 
                if (!mapping) {
                        unlock_page_memcg(page);
                        return 1;
                }
 
-               spin_lock_irqsave(&mapping->tree_lock, flags);
+               spin_lock_irq(&mapping->tree_lock);
                BUG_ON(page_mapping(page) != mapping);
                WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page));
                account_page_dirtied(page, mapping);
                radix_tree_tag_set(&mapping->page_tree, page_index(page),
                                   PAGECACHE_TAG_DIRTY);
-               spin_unlock_irqrestore(&mapping->tree_lock, flags);
+               spin_unlock_irq(&mapping->tree_lock);
                unlock_page_memcg(page);
 
                if (mapping->host) {
-- 
2.17.0