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authorDavid Sterba <dsterba@suse.cz>2012-01-26 15:01:12 -0500
committerDavid Sterba <dsterba@suse.cz>2012-02-15 16:40:25 +0100
commitc08782dacd7a098f2b8bca7f4a57a5b402e9e1e5 (patch)
treef86a4875ac874cd3ddd0cc2eae85701e87105a72 /fs/btrfs/extent_map.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/extent_map.h')
-rw-r--r--fs/btrfs/extent_map.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 33a7890b1f4..1195f09761f 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 {