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| author | Yonghong Song <yhs@fb.com> | 2022-12-03 10:46:13 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-12-04 12:52:40 -0800 |
| commit | f53625649888c6ec9eeca151f802e905482c6698 (patch) | |
| tree | ce785f382237fb42178ddb609ae78bfb334357bf /Documentation/bpf | |
| parent | 8723ec22a31db3f400fce440c235ada0fff95657 (diff) | |
| download | linux-f53625649888c6ec9eeca151f802e905482c6698.tar.bz2 | |
docs/bpf: Add KF_RCU documentation
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>
Diffstat (limited to 'Documentation/bpf')
| -rw-r--r-- | Documentation/bpf/kfuncs.rst | 9 |
1 files changed, 9 insertions, 0 deletions
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 -------------------------- |