[v6,42/99] shmem: Convert shmem_confirm_swap to XArray

Commit Message

Matthew Wilcox (Oracle) Jan. 17, 2018, 8:21 p.m. UTC

From: Matthew Wilcox <[e-mail]>

xa_load has its own RCU locking, so we can eliminate it here.

Signed-off-by: Matthew Wilcox <[e-mail]>
---
 mm/shmem.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

Patch

diff --git a/mm/shmem.c b/mm/shmem.c
index fad6c9e7402e..654f367aca90 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -348,12 +348,7 @@  static int shmem_xa_replace(struct address_space *mapping,
 static bool shmem_confirm_swap(struct address_space *mapping,
 			       pgoff_t index, swp_entry_t swap)
 {
-	void *item;
-
-	rcu_read_lock();
-	item = radix_tree_lookup(&mapping->pages, index);
-	rcu_read_unlock();
-	return item == swp_to_radix_entry(swap);
+	return xa_load(&mapping->pages, index) == swp_to_radix_entry(swap);
 }
 
 /*