linux-kernel - Re: [RFC] bpf.2: Use standard types and attributes

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Message-ID: <CAADnVQLf4qe3Hj7cjBUCY4wXb9t2ZjUt=Z=JuygRY0LNNHWAoA@mail.gmail.com>
Date:   Fri, 23 Apr 2021 16:20:26 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Alejandro Colomar <alx.manpages@...il.com>,
        bpf <bpf@...r.kernel.org>
Cc:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
        linux-man <linux-man@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, libc-alpha@...rceware.org,
        gcc-patches@....gnu.org
Subject: Re: [RFC] bpf.2: Use standard types and attributes

On Fri, Apr 23, 2021 at 4:15 PM Alejandro Colomar
<alx.manpages@...il.com> wrote:
>
> Some manual pages are already using C99 syntax for integral
> types 'uint32_t', but some aren't.  There are some using kernel
> syntax '__u32'.  Fix those.
>
> Some pages also document attributes, using GNU syntax
> '__attribute__((xxx))'.  Update those to use the shorter and more
> portable C2x syntax, which hasn't been standardized yet, but is
> already implemented in GCC, and available through either --std=c2x
> or any of the --std=gnu... options.
>
> Signed-off-by: Alejandro Colomar <alx.manpages@...il.com>
> ---
>  man2/bpf.2 | 47 +++++++++++++++++++++++------------------------
>  1 file changed, 23 insertions(+), 24 deletions(-)
>
> diff --git a/man2/bpf.2 b/man2/bpf.2
> index 6e1ffa198..204f01bfc 100644
> --- a/man2/bpf.2
> +++ b/man2/bpf.2
> @@ -188,39 +188,38 @@ commands:
>  .EX
>  union bpf_attr {
>      struct {    /* Used by BPF_MAP_CREATE */
> -        __u32         map_type;
> -        __u32         key_size;    /* size of key in bytes */
> -        __u32         value_size;  /* size of value in bytes */
> -        __u32         max_entries; /* maximum number of entries
> -                                      in a map */
> +        uint32_t    map_type;
> +        uint32_t    key_size;    /* size of key in bytes */
> +        uint32_t    value_size;  /* size of value in bytes */
> +        uint32_t    max_entries; /* maximum number of entries
> +                                    in a map */

Nack.
The man page should describe the kernel api the way it is in .h file.