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authorRasmus Villemoes <linux@rasmusvillemoes.dk>2016-09-15 00:25:03 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2016-09-27 21:45:46 -0400
commitde04e76935ad5985d318fbce298a17e9dd2092b7 (patch)
tree6f334950fb361d3e1fe57dd264e66876887d3ac8
parentbe218aa2e3f7aa698cdce5a4efb1e178677db8fd (diff)
fs/aio.c: eliminate redundant loads in put_aio_ring_file
Using a local variable we can prevent gcc from reloading aio_ring_file->f_inode->i_mapping twice, eliminating 2x2 dependent loads. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/aio.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/aio.c b/fs/aio.c
index 4fe81d1c60f9..1157e13a36d6 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -274,14 +274,17 @@ __initcall(aio_setup);
static void put_aio_ring_file(struct kioctx *ctx)
{
struct file *aio_ring_file = ctx->aio_ring_file;
+ struct address_space *i_mapping;
+
if (aio_ring_file) {
truncate_setsize(aio_ring_file->f_inode, 0);
/* Prevent further access to the kioctx from migratepages */
- spin_lock(&aio_ring_file->f_inode->i_mapping->private_lock);
- aio_ring_file->f_inode->i_mapping->private_data = NULL;
+ i_mapping = aio_ring_file->f_inode->i_mapping;
+ spin_lock(&i_mapping->private_lock);
+ i_mapping->private_data = NULL;
ctx->aio_ring_file = NULL;
- spin_unlock(&aio_ring_file->f_inode->i_mapping->private_lock);
+ spin_unlock(&i_mapping->private_lock);
fput(aio_ring_file);
}