linux-kernel - [PATCH 05/10] don't use spin_lock

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Date:   Fri, 18 May 2018 03:49:08 -0400
From:   Kent Overstreet <kent.overstreet@...il.com>
To:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:     Kent Overstreet <kent.overstreet@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Chinner <dchinner@...hat.com>, darrick.wong@...cle.com,
        tytso@....edu, linux-btrfs@...r.kernel.org, clm@...com,
        jbacik@...com, viro@...iv.linux.org.uk, willy@...radead.org,
        peterz@...radead.org
Subject: [PATCH 05/10] don't use spin_lock_irqsave() unnecessarily

Signed-off-by: Kent Overstreet <kent.overstreet@...il.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