tree 9c6360e09f1ec15e5f85ec0cf6f5f79b7824a152
parent 33398cf2f360c5ce24c8a22436d52a06ad4e5eb5
author Michal Hocko <mhocko@suse.cz> 1441749664 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1441751728 -0700

memcg: get rid of mem_cgroup_root_css for !CONFIG_MEMCG

The only user is cgwb_bdi_init and that one depends on
CONFIG_CGROUP_WRITEBACK which in turn depends on CONFIG_MEMCG so it
doesn't make much sense to definte an empty stub for !CONFIG_MEMCG.
Moreover ERR_PTR(-EINVAL) is ugly and would lead to runtime crashes if
used in unguarded code paths.  Better fail during compilation.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>