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

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Message-ID: <CANEJEGuj0HO2GH_vHdFEB6MnPJ95QrsjNrP+eHbGPpnoV4fAjg@mail.gmail.com>
Date:   Thu, 23 Mar 2017 14:47:39 -0700
From:   Grant Grundler <grundler@...omium.org>
To:     Clemens Ladisch <clemens@...isch.de>
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <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

On Tue, Mar 14, 2017 at 12:56 AM, Clemens Ladisch <clemens@...isch.de> wrote:
> 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>

Any other feedback on this patch?
Or has this already been added to someone's "for-linus" branch?

just looking for update on patch status.

cheers,
grant

>
>> ---
>>  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;