memcg: get rid of mem_cgroup_root_css for !CONFIG_MEMCG

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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>

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Michal Hocko 2015-09-08 15:01:04 -07:00 • committed by Linus Torvalds

parent 33398cf2f3

commit fabc3fdde0

1 changed files with 0 additions and 2 deletions

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include/linux/memcontrol.h

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