linux-kernel - Re: [PATCH v1] hpet: Make cmd parameter of hpet_ioctl

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Date:   Tue, 14 Mar 2017 08:56:17 +0100
From:   Clemens Ladisch <clemens@...isch.de>
To:     Matthias Kaehlcke <mka@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Grant Grundler <grundler@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v1] hpet: Make cmd parameter of hpet_ioctl_common()
 unsigned

Matthias Kaehlcke wrote:
> The value passed by the two callers of the function is unsigned anyway.

Indeed; and those are just simple wrappers.

> Making the parameter unsigned fixes the following warning when building
> with clang:
>
> drivers/char/hpet.c:588:7: error: overflow converting case value to switch condition type (2149083139 to 18446744071563667459) [-Werror,-Wswitch]
>         case HPET_INFO:
>              ^
> include/uapi/linux/hpet.h:18:19: note: expanded from macro 'HPET_INFO'
>                         ^
> include/uapi/asm-generic/ioctl.h:77:28: note: expanded from macro '_IOR'
>                                 ^
> include/uapi/asm-generic/ioctl.h:66:2: note: expanded from macro '_IOC'
>         (((dir)  << _IOC_DIRSHIFT) | \
>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>

Acked-by: Clemens Ladisch <clemens@...isch.de>

> ---
>  drivers/char/hpet.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
> index 20b32bb8c2af..0d633b76c29e 100644
> --- a/drivers/char/hpet.c
> +++ b/drivers/char/hpet.c
> @@ -574,7 +574,7 @@ static inline unsigned long hpet_time_div(struct hpets *hpets,
>  }
>
>  static int
> -hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg,
> +hpet_ioctl_common(struct hpet_dev *devp, unsigned int cmd, unsigned long arg,
>  		  struct hpet_info *info)
>  {
>  	struct hpet_timer __iomem *timer;