Drivers may wish to limit their own cgroup operations to cgroups in the
cgroup-v2 hierarchy. Let's make this helper function usable outside the cgroup
core code.
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: cgroups@xxxxxxxxxxxxxxx
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
include/linux/cgroup.h | 2 ++
kernel/cgroup/cgroup-internal.h | 1 -
kernel/cgroup/cgroup.c | 1 +
3 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index c9896027ed99..1c1758ac1a97 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -656,6 +656,8 @@ static inline union kernfs_node_id *cgroup_get_kernfs_id(struct cgroup *cgrp)
void cgroup_path_from_kernfs_id(const union kernfs_node_id *id,
char *buf, size_t buflen);
+bool cgroup_on_dfl(const struct cgroup *cgrp);
+
#else /* !CONFIG_CGROUPS */
struct cgroup_subsys_state;
diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h
index b928b27050c6..7338083ee3bc 100644
--- a/kernel/cgroup/cgroup-internal.h
+++ b/kernel/cgroup/cgroup-internal.h
@@ -156,7 +156,6 @@ static inline void get_css_set(struct css_set *cset)
}
bool cgroup_ssid_enabled(int ssid);
-bool cgroup_on_dfl(const struct cgroup *cgrp);
bool cgroup_is_thread_root(struct cgroup *cgrp);
bool cgroup_is_threaded(struct cgroup *cgrp);
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index f12c32c6ec7f..6069191653f8 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -298,6 +298,7 @@ bool cgroup_on_dfl(const struct cgroup *cgrp)
{
return cgrp->root == &cgrp_dfl_root;
}
+EXPORT_SYMBOL(cgroup_on_dfl);
/* IDR wrappers which synchronize using cgroup_idr_lock */
static int cgroup_idr_alloc(struct idr *idr, void *ptr, int start, int end,
--
2.14.3
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