Commit f5362564 authored by Yonghong Song's avatar Yonghong Song Committed by Alexei Starovoitov
Browse files

docs/bpf: Add KF_RCU documentation 



Add proper KF_RCU documentation in kfuncs.rst.

Signed-off-by: default avatarYonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20221203184613.478967-1-yhs@fb.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 8723ec22

Documentation/bpf/kfuncs.rst

+9 −0
Original line number Diff line number Diff line
@@ -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

--------------------------