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btrfs: fix structs where bitfields and spinlock/atomic share 8B word

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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>
This commit is contained in:
David Sterba 2012-01-26 15:01:12 -05:00
parent 87826df0ec
commit c08782dacd
2 changed files with 3 additions and 3 deletions
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2
fs/btrfs/ctree.h
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@ -886,7 +886,7 @@ struct btrfs_block_rsv {
u64 reserved; u64 reserved;
struct btrfs_space_info *space_info; struct btrfs_space_info *space_info;
spinlock_t lock; spinlock_t lock;
unsigned int full:1; unsigned int full;
}; };
/* /*

4
fs/btrfs/extent_map.h
View file

@ -26,8 +26,8 @@ struct extent_map {
unsigned long flags; unsigned long flags;
struct block_device *bdev; struct block_device *bdev;
atomic_t refs; atomic_t refs;
unsigned int in_tree:1; unsigned int in_tree;
unsigned int compress_type:4; unsigned int compress_type;
}; };
struct extent_map_tree { struct extent_map_tree {