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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Alejandro Colomar <alx.manpages@gmail.com>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
	linux-man <linux-man@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	glibc <libc-alpha@sourceware.org>, GCC <gcc-patches@gcc.gnu.org>,
	bpf <bpf@vger.kernel.org>, David Laight <David.Laight@aculab.com>,
	Zack Weinberg <zackw@panix.com>,
	Joseph Myers <joseph@codesourcery.com>
Subject: Re: [RFC v2] bpf.2: Use standard types and attributes
Date: Tue, 4 May 2021 07:12:01 -0700
Message-ID: <CAADnVQLdW=jH1CUP02jokEu3Sh+=xKsCXvjA19kfz7KOn9mzkA@mail.gmail.com> (raw)
In-Reply-To: <20210504110519.16097-1-alx.manpages@gmail.com>

On Tue, May 4, 2021 at 4:05 AM Alejandro Colomar <alx.manpages@gmail.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 C11 keywords such as 'alignas()' when possible, and C2x
> syntax '[[gnu::xxx]]' elsewhere, 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.
>
> The standard isn't very clear on how to use alignas() or
> [[]]-style attributes, so the following link is useful in the case
> of 'alignas()' and '[[gnu::aligned()]]':
> <https://stackoverflow.com/q/67271825/6872717>
>
> Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
> Cc: LKML <linux-kernel@vger.kernel.org>
> Cc: glibc <libc-alpha@sourceware.org>
> Cc: GCC <gcc-patches@gcc.gnu.org>
> Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
> Cc: bpf <bpf@vger.kernel.org>
> Cc: David Laight <David.Laight@ACULAB.COM>
> Cc: Zack Weinberg <zackw@panix.com>
> Cc: Joseph Myers <joseph@codesourcery.com>
> ---
>  man2/bpf.2 | 49 ++++++++++++++++++++++++-------------------------
>  1 file changed, 24 insertions(+), 25 deletions(-)
>
> diff --git a/man2/bpf.2 b/man2/bpf.2
> index 6e1ffa198..04b8fbcef 100644
> --- a/man2/bpf.2
> +++ b/man2/bpf.2
> @@ -186,41 +186,40 @@ commands:
>  .PP
>  .in +4n
>  .EX
> -union bpf_attr {
> +union [[gnu::aligned(8)]] 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 */

For the same reasons as explained earlier:
Nacked-by: Alexei Starovoitov <ast@kernel.org>

  reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210423230609.13519-1-alx.manpages@gmail.com>
2021-04-23 23:20 ` [RFC] " Alexei Starovoitov
2021-04-24 17:56   ` Alejandro Colomar (man-pages)
2021-04-25 16:52     ` Alexei Starovoitov
2021-04-25 19:12       ` Zack Weinberg
2021-04-24 20:43   ` David Laight
2021-04-25 19:16     ` Zack Weinberg
2021-04-25 21:09       ` David Laight
2021-05-04 11:05 ` [RFC v2] " Alejandro Colomar
2021-05-04 14:12   ` Alexei Starovoitov [this message]
2021-05-04 14:24     ` Greg KH
2021-05-04 15:53       ` Alejandro Colomar (man-pages)
2021-05-04 16:06         ` Greg KH
2021-05-04 18:37           ` Zack Weinberg
2021-05-04 18:54             ` Alejandro Colomar (man-pages)
2021-05-04 19:45               ` Florian Weimer
2021-05-04 19:59                 ` Alejandro Colomar (man-pages)
2021-05-05  8:23                 ` David Laight
2021-05-05 22:22                   ` Joseph Myers
2021-05-04 20:06               ` Daniel Borkmann
2021-05-04 20:16                 ` Alejandro Colomar (man-pages)
2021-05-04 20:33                 ` Zack Weinberg
2021-05-04 21:23                   ` Alexei Starovoitov
2021-05-15 19:01               ` [PATCH v3] " Alejandro Colomar
2021-05-16  9:16                 ` Alejandro Colomar (man-pages)
2021-05-17 18:56                   ` Daniel Borkmann
2021-05-21 11:12                     ` Alejandro Colomar
2021-05-04 16:08         ` [RFC v2] " Daniel Borkmann

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