mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

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>
This commit is contained in:
David Sterba 2012-01-26 15:01:12 -05:00
parent 87826df0ec
commit c08782dacd
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/btrfs/ctree.h
View File

@ -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;
};
/*

4
fs/btrfs/extent_map.h
View File

@ -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 {