tree e938df0fd8040a69da38a277c753aac42272c292
parent 215752fce31c80f3b3a1530bc7cddb3ba6a69b3a
author Al Viro <viro@zeniv.linux.org.uk> 1407409468 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1407436808 -0400

acct: get rid of acct_lock for acct->count

* make acct->count atomic and acct freeing - rcu-delayed.
* instead of grabbing acct_lock around the places where we take a reference,
do that under rcu_read_lock() with atomic_long_inc_not_zero().
* have the new acct locked before making ns->bacct point to it

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>