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btrfs: annotate device name rcu_string with __rcu

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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\\");

Annotating the btrfs_device::name member with __rcu fixes the sparse
error.

Acked-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Madhuparna Bhowmik 2019-12-05 01:49:01 +05:30 committed by David Sterba
parent 96c2e067ed
commit 8d1a7aae89
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/volumes.h
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@ -58,7 +58,7 @@ 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;