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| author | David Sterba <dsterba@suse.cz> | 2012-01-27 00:01:12 +0400 |
|---|---|---|
| committer | David Sterba <dsterba@suse.cz> | 2012-02-15 19:40:25 +0400 |
| commit | c08782dacd7a098f2b8bca7f4a57a5b402e9e1e5 (patch) | |
| tree | f86a4875ac874cd3ddd0cc2eae85701e87105a72 /fs/btrfs/extent_map.h | |
| parent | 87826df0ec36fc28884b4ddbb3f3af41c4c2008f (diff) | |
| download | linux-c08782dacd7a098f2b8bca7f4a57a5b402e9e1e5.tar.xz | |
btrfs: fix structs where bitfields and spinlock/atomic share 8B word
On ia64, powerpc64 and sparc64 the bitfield is modified through a RMW cycle and current
gcc rewrites the adjacent 4B word, which in case of a spinlock or atomic has
disaterous effect.
https://lkml.org/lkml/2012/2/1/220
Signed-off-by: David Sterba <dsterba@suse.cz>
Diffstat (limited to 'fs/btrfs/extent_map.h')
| -rw-r--r-- | fs/btrfs/extent_map.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h index 33a7890b1f40..1195f09761fe 100644 --- a/fs/btrfs/extent_map.h +++ b/fs/btrfs/extent_map.h @@ -26,8 +26,8 @@ struct extent_map { unsigned long flags; struct block_device *bdev; atomic_t refs; - unsigned int in_tree:1; - unsigned int compress_type:4; + unsigned int in_tree; + unsigned int compress_type; }; struct extent_map_tree { |