[PATCH bpf-next 1/2] bpf: Fix doxygen comments for dynptr slice kfuncs

[PATCH bpf-next 1/2] bpf: Fix doxygen comments for dynptr slice kfuncs

[David Vernet]

In commit 66e3a13e7c2c ("bpf: Add bpf_dynptr_slice and
bpf_dynptr_slice_rdwr"), the bpf_dynptr_slice() and
bpf_dynptr_slice_rdwr() kfuncs were added to BPF. These kfuncs included
doxygen headers, but unfortunately those headers are not properly
formatted according to [0], and causes the following warnings during the
docs build:

./kernel/bpf/helpers.c:2225: warning: \
    Excess function parameter 'returns' description in 'bpf_dynptr_slice'
./kernel/bpf/helpers.c:2303: warning: \
    Excess function parameter 'returns' description in 'bpf_dynptr_slice_rdwr'
...

This patch fixes those doxygen comments.

[0]: https://docs.kernel.org/doc-guide/kernel-doc.html#function-documentation

Fixes: 66e3a13e7c2c ("bpf: Add bpf_dynptr_slice and bpf_dynptr_slice_rdwr")
Signed-off-by: David Vernet <void@manifault.com>
---
 kernel/bpf/helpers.c | 30 ++++++++++++++----------------
 1 file changed, 14 insertions(+), 16 deletions(-)

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 648b29e78b84..58431a92bb65 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -2194,7 +2194,12 @@ __bpf_kfunc struct task_struct *bpf_task_from_pid(s32 pid)
 }
 
 /**
- * bpf_dynptr_slice - Obtain a read-only pointer to the dynptr data.
+ * bpf_dynptr_slice() - Obtain a read-only pointer to the dynptr data.
+ * @ptr: The dynptr whose data slice to retrieve
+ * @offset: Offset into the dynptr
+ * @buffer: User-provided buffer to copy contents into
+ * @buffer__szk: Size (in bytes) of the buffer. This is the length of the
+ *		 requested slice. This must be a constant.
  *
  * For non-skb and non-xdp type dynptrs, there is no difference between
  * bpf_dynptr_slice and bpf_dynptr_data.
@@ -2209,13 +2214,7 @@ __bpf_kfunc struct task_struct *bpf_task_from_pid(s32 pid)
  * bpf_dynptr_slice will not invalidate any ctx->data/data_end pointers in
  * the bpf program.
  *
- * @ptr: The dynptr whose data slice to retrieve
- * @offset: Offset into the dynptr
- * @buffer: User-provided buffer to copy contents into
- * @buffer__szk: Size (in bytes) of the buffer. This is the length of the
- * requested slice. This must be a constant.
- *
- * @returns: NULL if the call failed (eg invalid dynptr), pointer to a read-only
+ * Return: NULL if the call failed (eg invalid dynptr), pointer to a read-only
  * data slice (can be either direct pointer to the data or a pointer to the user
  * provided buffer, with its contents containing the data, if unable to obtain
  * direct pointer)
@@ -2258,7 +2257,12 @@ __bpf_kfunc void *bpf_dynptr_slice(const struct bpf_dynptr_kern *ptr, u32 offset
 }
 
 /**
- * bpf_dynptr_slice_rdwr - Obtain a writable pointer to the dynptr data.
+ * bpf_dynptr_slice_rdwr() - Obtain a writable pointer to the dynptr data.
+ * @ptr: The dynptr whose data slice to retrieve
+ * @offset: Offset into the dynptr
+ * @buffer: User-provided buffer to copy contents into
+ * @buffer__szk: Size (in bytes) of the buffer. This is the length of the
+ *		 requested slice. This must be a constant.
  *
  * For non-skb and non-xdp type dynptrs, there is no difference between
  * bpf_dynptr_slice and bpf_dynptr_data.
@@ -2287,13 +2291,7 @@ __bpf_kfunc void *bpf_dynptr_slice(const struct bpf_dynptr_kern *ptr, u32 offset
  * bpf_dynptr_slice_rdwr will not invalidate any ctx->data/data_end pointers in
  * the bpf program.
  *
- * @ptr: The dynptr whose data slice to retrieve
- * @offset: Offset into the dynptr
- * @buffer: User-provided buffer to copy contents into
- * @buffer__szk: Size (in bytes) of the buffer. This is the length of the
- * requested slice. This must be a constant.
- *
- * @returns: NULL if the call failed (eg invalid dynptr), pointer to a
+ * Return: NULL if the call failed (eg invalid dynptr), pointer to a
  * data slice (can be either direct pointer to the data or a pointer to the user
  * provided buffer, with its contents containing the data, if unable to obtain
  * direct pointer)
-- 
2.39.0

[PATCH bpf-next 2/2] bpf, docs: Fix __uninit kfunc doc section

[David Vernet]

In commit d96d937d7c5c ("bpf: Add __uninit kfunc annotation"), the
__uninit kfunc annotation was documented in kfuncs.rst. You have to
fully underline a section in rst, or the build will issue a warning that
the title underline is too short:

./Documentation/bpf/kfuncs.rst:104: WARNING: Title underline too short.

2.2.2 __uninit Annotation
--------------------

This patch fixes that title underline.

Fixes: d96d937d7c5c ("bpf: Add __uninit kfunc annotation")
Signed-off-by: David Vernet <void@manifault.com>
---
 Documentation/bpf/kfuncs.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/bpf/kfuncs.rst b/Documentation/bpf/kfuncs.rst
index 9a78533d25ac..9d85bbc3b771 100644
--- a/Documentation/bpf/kfuncs.rst
+++ b/Documentation/bpf/kfuncs.rst
@@ -101,7 +101,7 @@ size parameter, and the value of the constant matters for program safety, __k
 suffix should be used.
 
 2.2.2 __uninit Annotation
---------------------
+-------------------------
 
 This annotation is used to indicate that the argument will be treated as
 uninitialized.
-- 
2.39.0

Re: [PATCH bpf-next 1/2] bpf: Fix doxygen comments for dynptr slice kfuncs

[patchwork-bot+netdevbpf]

Hello:

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

On Wed,  1 Mar 2023 13:49:09 -0600 you wrote:
> In commit 66e3a13e7c2c ("bpf: Add bpf_dynptr_slice and
> bpf_dynptr_slice_rdwr"), the bpf_dynptr_slice() and
> bpf_dynptr_slice_rdwr() kfuncs were added to BPF. These kfuncs included
> doxygen headers, but unfortunately those headers are not properly
> formatted according to [0], and causes the following warnings during the
> docs build:
> 
> [...]

Here is the summary with links:
  - [bpf-next,1/2] bpf: Fix doxygen comments for dynptr slice kfuncs
    https://git.kernel.org/bpf/bpf-next/c/7ce60b110eec
  - [bpf-next,2/2] bpf, docs: Fix __uninit kfunc doc section
    https://git.kernel.org/bpf/bpf-next/c/db52b587c67f

You are awesome, thank you!
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