[PATCH v3 bpf-next 1/2] bpf, docs: add kernel version to map_cgroup_storage

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This adds the version at which this map became available to use in the
documentation

Signed-off-by: Dave Tucker <dave@xxxxxxxxxxxxx>
---
 Documentation/bpf/map_cgroup_storage.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/bpf/map_cgroup_storage.rst b/Documentation/bpf/map_cgroup_storage.rst
index cab9543017bf..b626cb068846 100644
--- a/Documentation/bpf/map_cgroup_storage.rst
+++ b/Documentation/bpf/map_cgroup_storage.rst
@@ -5,6 +5,8 @@
 BPF_MAP_TYPE_CGROUP_STORAGE
 ===========================
 
+.. note:: Introduced in Kernel version 4.19
+
 The ``BPF_MAP_TYPE_CGROUP_STORAGE`` map type represents a local fix-sized
 storage. It is only available with ``CONFIG_CGROUP_BPF``, and to programs that
 attach to cgroups; the programs are made available by the same Kconfig. The
-- 
2.33.1




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