mm: don't include <linux/blk-cgroup.h> in <linux/backing-dev.h>

There is no need to pull blk-cgroup.h and thus blkdev.h in here, so
break the include chain.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20210920123328.1399408-3-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

arch/powerpc/platforms/cell/spufs/inode.c

@@ -21,6 +21,7 @@
 #include <linux/namei.h>
 #include <linux/pagemap.h>
 #include <linux/poll.h>
+#include <linux/seq_file.h>
 #include <linux/slab.h>
 
 #include <asm/prom.h>

block/blk-iolatency.c

@@ -74,6 +74,7 @@
 #include <linux/sched/signal.h>
 #include <trace/events/block.h>
 #include <linux/blk-mq.h>
+#include <linux/blk-cgroup.h>
 #include "blk-rq-qos.h"
 #include "blk-stat.h"
 #include "blk.h"

block/blk-mq.c

@@ -16,6 +16,7 @@
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 #include <linux/smp.h>
+#include <linux/interrupt.h>
 #include <linux/llist.h>
 #include <linux/list_sort.h>
 #include <linux/cpu.h>

block/bounce.c

@@ -14,6 +14,7 @@
 #include <linux/pagemap.h>
 #include <linux/mempool.h>
 #include <linux/blkdev.h>
+#include <linux/blk-cgroup.h>
 #include <linux/backing-dev.h>
 #include <linux/init.h>
 #include <linux/hash.h>

drivers/md/dm-ima.c

@@ -12,6 +12,7 @@
 #include "dm-ima.h"
 
 #include <linux/ima.h>
+#include <linux/sched/mm.h>
 #include <crypto/hash.h>
 #include <linux/crypto.h>
 #include <crypto/hash_info.h>

fs/btrfs/compression.c

@@ -9,6 +9,7 @@
 #include <linux/fs.h>
 #include <linux/pagemap.h>
 #include <linux/highmem.h>
+#include <linux/kthread.h>
 #include <linux/time.h>
 #include <linux/init.h>
 #include <linux/string.h>

fs/btrfs/ctree.c

@@ -7,6 +7,7 @@
 #include <linux/slab.h>
 #include <linux/rbtree.h>
 #include <linux/mm.h>
+#include <linux/error-injection.h>
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"

fs/f2fs/compress.c

@@ -7,6 +7,7 @@
 
 #include <linux/fs.h>
 #include <linux/f2fs_fs.h>
+#include <linux/moduleparam.h>
 #include <linux/writeback.h>
 #include <linux/backing-dev.h>
 #include <linux/lzo.h>

fs/orangefs/super.c

@@ -11,6 +11,7 @@
 
 #include <linux/parser.h>
 #include <linux/hashtable.h>
+#include <linux/seq_file.h>
 
 /* a cache for orangefs-inode objects (i.e. orangefs inode private data) */
 static struct kmem_cache *orangefs_inode_cache;

fs/ramfs/inode.c

@@ -38,6 +38,7 @@
 #include <linux/uaccess.h>
 #include <linux/fs_context.h>
 #include <linux/fs_parser.h>
+#include <linux/seq_file.h>
 #include "internal.h"
 
 struct ramfs_mount_opts {

include/linux/backing-dev.h

@@ -15,10 +15,11 @@
 #include <linux/blkdev.h>
 #include <linux/device.h>
 #include <linux/writeback.h>
-#include <linux/blk-cgroup.h>
 #include <linux/backing-dev-defs.h>
 #include <linux/slab.h>
 
+struct blkcg;
+
 static inline struct backing_dev_info *bdi_get(struct backing_dev_info *bdi)
 {
 	kref_get(&bdi->refcnt);

mm/backing-dev.c

@@ -2,8 +2,9 @@
 
 #include <linux/wait.h>
 #include <linux/rbtree.h>
-#include <linux/backing-dev.h>
 #include <linux/kthread.h>
+#include <linux/backing-dev.h>
+#include <linux/blk-cgroup.h>
 #include <linux/freezer.h>
 #include <linux/fs.h>
 #include <linux/pagemap.h>

mm/swapfile.c

@@ -18,7 +18,7 @@
 #include <linux/pagemap.h>
 #include <linux/namei.h>
 #include <linux/shmem_fs.h>
-#include <linux/blkdev.h>
+#include <linux/blk-cgroup.h>
 #include <linux/random.h>
 #include <linux/writeback.h>
 #include <linux/proc_fs.h>