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docs/bpf: Add KF_RCU documentation

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Add proper KF_RCU documentation in kfuncs.rst.

Signed-off-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20221203184613.478967-1-yhs@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Yonghong Song 2022-12-03 10:46:13 -08:00 committed by Alexei Starovoitov
parent 8723ec22a3
commit f536256498
1 changed files with 9 additions and 0 deletions
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Documentation/bpf/kfuncs.rst
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@ -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
--------------------------