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6ab428604f72 ("cgroup: Implement DEBUG_CGROUP_REF") added a config option
which forces cgroup refcnt functions to be not inlined so that they can be
kprobed for debugging. However, it forgot export them when the config is
enabled breaking modules which make use of css reference counting.
Fix it by adding CGROUP_REF_EXPORT() macro to cgroup_refcnt.h which is
defined to EXPORT_SYMBOL_GPL when CONFIG_DEBUG_CGROUP_REF is set.
Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: 6ab428604f72 ("cgroup: Implement DEBUG_CGROUP_REF")
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