fs: kill BDI_CAP_SWAP_BACKED

This bdi flag isn't too useful - we can determine that a vma is backed by
either swap or shmem trivially in the caller.

This also allows removing the backing_dev_info instaces for swap and shmem
in favor of noop_backing_dev_info.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/mm/swap.c b/mm/swap.c
index 8a12b33936b4..4e0109a2f37b 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -1138,8 +1138,6 @@ void __init swap_setup(void)
 #ifdef CONFIG_SWAP
         int i;
 
-        if (bdi_init(swapper_spaces[0].backing_dev_info))
-                panic("Failed to init swap bdi");
         for (i = 0; i < MAX_SWAPFILES; i++) {
                 spin_lock_init(&swapper_spaces[i].tree_lock);
                 INIT_LIST_HEAD(&swapper_spaces[i].i_mmap_nonlinear);