From c08782dacd7a098f2b8bca7f4a57a5b402e9e1e5 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Thu, 26 Jan 2012 15:01:12 -0500 Subject: 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 --- fs/btrfs/ctree.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/btrfs/ctree.h') 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 { u64 reserved; struct btrfs_space_info *space_info; spinlock_t lock; - unsigned int full:1; + unsigned int full; }; /* -- cgit v1.2.3