bpf: Sync uapi bpf.h header for the tooling infra

Commit 0abff462d802 ("bpf: Add comment about helper freeze") missed the
tooling header sync. Fix it.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20250213050427.2788837-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 2acf9b33637174bd16b1d12ccc6410c5f55a7ea9..fff6cdb8d11a2c211a6205ae2937b2bdf593cd42 100644 (file)
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -6019,7 +6019,10 @@ union bpf_attr {
        FN(user_ringbuf_drain, 209, ##ctx)              \
        FN(cgrp_storage_get, 210, ##ctx)                \
        FN(cgrp_storage_delete, 211, ##ctx)             \
-       /* */
+       /* This helper list is effectively frozen. If you are trying to \
+        * add a new helper, you should add a kfunc instead which has   \
+        * less stability guarantees. See Documentation/bpf/kfuncs.rst  \
+        */
 
 /* backwards-compatibility macros for users of __BPF_FUNC_MAPPER that don't
  * know or care about integer value that is now passed as second argument