fs.h: remove 8 bytes of padding from block_device on 64bit builds

Re-ordering struct block_inode to remove 8 bytes of padding on 64 bit
builds, which also shrinks bdev_inode by 8 bytes (776 -> 768) allowing it
to fit into one fewer cache lines.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7061a85..12529e9 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -662,9 +662,9 @@ struct address_space {
 
 struct block_device {
        dev_t                   bd_dev;  /* not a kdev_t - it's a search key */
+       int                     bd_openers;
        struct inode *          bd_inode;       /* will die */
        struct super_block *    bd_super;
-       int                     bd_openers;
        struct mutex            bd_mutex;       /* open/close mutex */
        struct list_head        bd_inodes;
        void *                  bd_claiming;