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[bpf-next,v2,3/3] docs/bpf: Add KF_RCU documentation

Message ID 20221203184613.478967-1-yhs@fb.com (mailing list archive)
State Accepted
Commit f53625649888c6ec9eeca151f802e905482c6698
Delegated to: BPF
Headers show
Series bpf: Handle MEM_RCU type properly | expand

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Commit Message

Yonghong Song Dec. 3, 2022, 6:46 p.m. UTC 
Add proper KF_RCU documentation in kfuncs.rst.

Signed-off-by: Yonghong Song <yhs@fb.com>
---
 Documentation/bpf/kfuncs.rst | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/Documentation/bpf/kfuncs.rst b/Documentation/bpf/kfuncs.rst
index 90774479ab7a..b027fe16ee66 100644
--- a/Documentation/bpf/kfuncs.rst
+++ b/Documentation/bpf/kfuncs.rst
@@ -191,6 +191,15 @@  rebooting or panicking. Due to this additional restrictions apply to these
 calls. At the moment they only require CAP_SYS_BOOT capability, but more can be
 added later.
 
+2.4.8 KF_RCU flag
+-----------------
+
+The KF_RCU flag is used for kfuncs which have a rcu ptr as its argument.
+When used together with KF_ACQUIRE, it indicates the kfunc should have a
+single argument which must be a trusted argument or a MEM_RCU pointer.
+The argument may have reference count of 0 and the kfunc must take this
+into consideration.
+
 2.5 Registering the kfuncs
 --------------------------