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btrfs: fix structs where bitfields and spinlock/atomic share 8B word
authorDavid Sterba <dsterba@suse.cz>
Thu, 26 Jan 2012 20:01:12 +0000 (15:01 -0500)
committerDavid Sterba <dsterba@suse.cz>
Wed, 15 Feb 2012 15:40:25 +0000 (16:40 +0100)
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>

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