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Subject[PATCH v4 0/9] devcg: introduce proper hierarchy support
This patchset implements device cgroup hierarchy. Behaviors and exceptions
will be propagated down in the tree and local preferences will be re-evaluated
everytime a change in its parent occours, reapplying them if it's still

branch: devcg_hierarchy_review

- minor fixes pointed by Tejun

- update documentation
- move css_online/css_offline changes to a new patch
- use cgroup_for_each_descendant_pre() instead of own descendant walk
- move exception_copy rework to a separared patch
- move exception_clean rework to a separated patch
- new patch to just move dev_exception_rm() before dev_exception_add()
as requested by Tejun.
- updated patch description for may_access() changes
- new patch to expand the may_access() logic before changing it
- fixed argument description order in may_access()

- rebase on top "device_cgroup: don't grab mutex in rcu callback"
- in case parent changes behavior or exceptions and the local exceptions won't
apply anymore, remove them instead of keeping them around.

Cc: Tejun Heo <>
Cc: Serge Hallyn <>
Signed-off-by: Aristeu Rozanski <>


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