linux-kernel - Re: [PATCH] staging: comedi: fix sparse warning in ni_mio

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Date:	Sat, 20 Jun 2015 07:48:11 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Geliang Tang <geliangtang@....com>
Cc:	abbotti@....co.uk, hsweeten@...ionengravers.com,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: comedi: fix sparse warning in ni_mio_common.c

On Sat, Jun 20, 2015 at 04:47:33PM +0000, Geliang Tang wrote:
> This patch fixes the following sparse warning:
> 
> drivers/staging/comedi/drivers/ni_mio_common.c:573:26: warning: shift
> too big (4294967295) for type int
> 
> Signed-off-by: Geliang Tang <geliangtang@....com>
> ---
>  drivers/staging/comedi/drivers/ni_mio_common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
> index 6cc304a..420f752 100644
> --- a/drivers/staging/comedi/drivers/ni_mio_common.c
> +++ b/drivers/staging/comedi/drivers/ni_mio_common.c
> @@ -570,7 +570,7 @@ static inline void ni_set_bitfield(struct comedi_device *dev, int reg,
>  static inline unsigned ni_stc_dma_channel_select_bitfield(unsigned channel)
>  {
>  	if (channel < 4)
> -		return 1 << channel;
> +		return 1 << (channel & 0x03);

Look at the code, this change makes no sense.

Sometimes tools are wrong, use them as a hint, not as something that has
to be silenced.

greg k-h
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