linux-kernel - Re: [PATCH v3 1/4] limits.h: add UCHAR_MAX, SCHAR_MAX, and SCHAR

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Message-ID: <4c01e43a-0275-04a0-ad9d-ee2f2bf24e1c@arm.com>
Date:   Mon, 12 Jun 2023 17:31:51 +0100
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Demi Marie Obenour <demi@...isiblethingslab.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Lee Jones <lee@...nel.org>, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v3 1/4] limits.h: add UCHAR_MAX, SCHAR_MAX, and SCHAR_MIN

Hi Demi,

On 6/10/23 21:40, Demi Marie Obenour wrote:
> Some drivers already defined these, and they will be used by sscanf()
> for overflow checks later.  Also add SSIZE_MIN to limits.h, which will
> also be needed later.
> 
> Signed-off-by: Demi Marie Obenour <demi@...isiblethingslab.com>
> ---
>  .../media/atomisp/pci/hive_isp_css_include/platform_support.h  | 1 -
>  include/linux/limits.h                                         | 1 +
>  include/linux/mfd/wl1273-core.h                                | 3 ---
>  include/vdso/limits.h                                          | 3 +++
>  4 files changed, 4 insertions(+), 4 deletions(-)
> 
...

> diff --git a/include/vdso/limits.h b/include/vdso/limits.h
> index 0197888ad0e00b2f853d3f25ffa764f61cca7385..0cad0a2490e5efc194d874025eb3e3b846a5c7b4 100644
> --- a/include/vdso/limits.h
> +++ b/include/vdso/limits.h
> @@ -2,6 +2,9 @@
>  #ifndef __VDSO_LIMITS_H
>  #define __VDSO_LIMITS_H
>  
> +#define UCHAR_MAX	((unsigned char)~0U)
> +#define SCHAR_MAX	((signed char)(UCHAR_MAX >> 1))
> +#define SCHAR_MIN	((signed char)(-SCHAR_MAX - 1))

Are you planning to use those definitions in the vDSO library?

If not can you please define them in linux/limits.h, the vdso headers contain
only what is necessary for the vDSO library.

Thanks!

>  #define USHRT_MAX	((unsigned short)~0U)
>  #define SHRT_MAX	((short)(USHRT_MAX >> 1))
>  #define SHRT_MIN	((short)(-SHRT_MAX - 1))

-- 
Regards,
Vincenzo