From: Madhuparna Bhowmik <madhuparnabhowmik04@xxxxxxxxx>
This patch fixes the following sparse errors in
fs/btrfs/super.c in function btrfs_show_devname()
fs/btrfs/super.c: error: incompatible types in comparison expression (different address spaces):
fs/btrfs/super.c: struct rcu_string [noderef] <asn:4> *
fs/btrfs/super.c: struct rcu_string *
The error was because of the following line in function btrfs_show_devname():
if (first_dev)
seq_escape(m, rcu_str_deref(first_dev->name), " \t\n\\");
rcu_str_deref is defined in fs/btrfs/rcu-string.h
And first_dev is of type struct btrfs_device.
struct btrfs_device is defined in fs/btrfs/volumes.h
Annotating the member "struct rcu_string *name " of struct btrfs_device
with __rcu fixes the sparse error.
Acked-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@xxxxxxxxx>
---
fs/btrfs/volumes.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index a7da1f3e3627..de7131ee604d 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -64,7 +64,7 @@ struct btrfs_device {
struct btrfs_fs_devices *fs_devices;
struct btrfs_fs_info *fs_info;
- struct rcu_string *name;
+ struct rcu_string __rcu *name;
u64 generation;
--
2.17.1
