tree 96826df796058560bc5dd1f7d8d476c5a741d7bc
parent 503af334ecf23b9d65d2ff0cc759f3a0bf338290
author Eric Dumazet <dada1@cosmosbay.com> 1130713336 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1130722639 -0800

[PATCH] reduce sizeof(struct file)

Now that RCU applied on 'struct file' seems stable, we can place f_rcuhead
in a memory location that is not anymore used at call_rcu(&f->f_rcuhead,
file_free_rcu) time, to reduce the size of this critical kernel object.

The trick I used is to move f_rcuhead and f_list in an union called f_u

The callers are changed so that f_rcuhead becomes f_u.fu_rcuhead and f_list
becomes f_u.f_list

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>