In commit 332ea1f697be ("bpf: Add bpf_cgroup_from_id() kfunc"), a new
bpf_cgroup_from_id() kfunc was added which allows a BPF program to
lookup and acquire a reference to a cgroup from a cgroup id. The
commit's doxygen comment seems to have copy-pasted fields, which causes
BPF kfunc helper documentation to fail to render:

<snip>/helpers.c:2114: warning: Excess function parameter 'cgrp'...
<snip>/helpers.c:2114: warning: Excess function parameter 'level'...

<snip>

<snip>/helpers.c:2114: warning: Excess function parameter 'level'...

This patch fixes the doxygen header.

Fixes: 332ea1f697be ("bpf: Add bpf_cgroup_from_id() kfunc")
Signed-off-by: David Vernet <void@manifault.com>
---
 kernel/bpf/helpers.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index a784be6f8bac..abdcc52f90a6 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -2106,8 +2106,7 @@ __bpf_kfunc struct cgroup *bpf_cgroup_ancestor(struct cgroup *cgrp, int level)
  * bpf_cgroup_from_id - Find a cgroup from its ID. A cgroup returned by this
  * kfunc which is not subsequently stored in a map, must be released by calling
  * bpf_cgroup_release().
- * @cgrp: The cgroup for which we're performing a lookup.
- * @level: The level of ancestor to look up.
+ * @cgid: cgroup id.
  */
 __bpf_kfunc struct cgroup *bpf_cgroup_from_id(u64 cgid)
 {
-- 
2.39.0

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Tue, 28 Feb 2023 09:28:45 -0600 you wrote:
> In commit 332ea1f697be ("bpf: Add bpf_cgroup_from_id() kfunc"), a new
> bpf_cgroup_from_id() kfunc was added which allows a BPF program to
> lookup and acquire a reference to a cgroup from a cgroup id. The
> commit's doxygen comment seems to have copy-pasted fields, which causes
> BPF kfunc helper documentation to fail to render:
> 
> <snip>/helpers.c:2114: warning: Excess function parameter 'cgrp'...
> <snip>/helpers.c:2114: warning: Excess function parameter 'level'...
> 
> [...]

Here is the summary with links:
  - [bpf-next] bpf: Fix bpf_cgroup_from_id() doxygen header
    https://git.kernel.org/bpf/bpf-next/c/30a2d8328d8a

You are awesome, thank you!
-- 
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On 2/28/23 7:28 AM, David Vernet wrote:
> In commit 332ea1f697be ("bpf: Add bpf_cgroup_from_id() kfunc"), a new
> bpf_cgroup_from_id() kfunc was added which allows a BPF program to
> lookup and acquire a reference to a cgroup from a cgroup id. The
> commit's doxygen comment seems to have copy-pasted fields, which causes
> BPF kfunc helper documentation to fail to render:
> 
> <snip>/helpers.c:2114: warning: Excess function parameter 'cgrp'...
> <snip>/helpers.c:2114: warning: Excess function parameter 'level'...
> 
> <snip>
> 
> <snip>/helpers.c:2114: warning: Excess function parameter 'level'...
> 
> This patch fixes the doxygen header.
> 
> Fixes: 332ea1f697be ("bpf: Add bpf_cgroup_from_id() kfunc")
> Signed-off-by: David Vernet <void@manifault.com>

Acked-by: Yonghong Song <yhs@fb.com>