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 <[email protected]> --- fs/aio.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/fs/aio.c b/fs/aio.c index fb8e45b88cd4..32ce10e55723 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -269,14 +269,17 @@ __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); } -- 2.1.4
