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/extent_map.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'fs/btrfs/extent_map.h') diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h index 33a7890b1f40..1195f09761fe 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 { -- cgit v1.2.3-70-g09d2