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btrfs: fix gcc-4.8 build warning for struct initializer

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Some older compilers like gcc-4.8 warn about mismatched curly braces in
a initializer:

fs/btrfs/backref.c: In function 'is_shared_data_backref':
fs/btrfs/backref.c:394:9: error: missing braces around
initializer [-Werror=missing-braces]
  struct prelim_ref target = {0};
         ^
fs/btrfs/backref.c:394:9: error: (near initialization for
'target.rbnode') [-Werror=missing-braces]

Use the GNU empty initializer extension to avoid this.

Fixes: ed58f2e66e ("btrfs: backref, don't add refs from shared block when resolving normal backref")
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Arnd Bergmann 2020-04-29 15:27:32 +02:00 committed by David Sterba
parent fcc99734d1
commit 9c6c723f48
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/backref.c
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@ -391,7 +391,7 @@ static int is_shared_data_backref(struct preftrees *preftrees, u64 bytenr)
struct rb_node **p = &preftrees->direct.root.rb_root.rb_node;
struct rb_node *parent = NULL;
struct prelim_ref *ref = NULL;
struct prelim_ref target = {0};
struct prelim_ref target = {};
int result;
target.parent = bytenr;