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authorDavid Sterba <dsterba@suse.cz>2012-01-26 15:01:12 -0500
committerDavid Sterba <dsterba@suse.cz>2012-02-15 10:40:25 -0500
commitc08782dacd7a098f2b8bca7f4a57a5b402e9e1e5 (patch)
treef86a4875ac874cd3ddd0cc2eae85701e87105a72 /fs/btrfs/ctree.h
parent87826df0ec36fc28884b4ddbb3f3af41c4c2008f (diff)
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/ctree.h')
-rw-r--r--fs/btrfs/ctree.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 3c2cbf7b6663..8e4457e0478e 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -886,7 +886,7 @@ struct btrfs_block_rsv {
886 u64 reserved; 886 u64 reserved;
887 struct btrfs_space_info *space_info; 887 struct btrfs_space_info *space_info;
888 spinlock_t lock; 888 spinlock_t lock;
889 unsigned int full:1; 889 unsigned int full;
890}; 890};
891 891
892/* 892/*