linux-kernel - Re: [PATCH] staging: media-atomisp : fix "dubious: !x

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Date:   Wed, 26 Aug 2020 12:50:00 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Anant Thazhemadam <anant.thazhemadam@...il.com>
Cc:     devel@...verdev.osuosl.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org
Subject: Re: [PATCH] staging: media-atomisp : fix "dubious: !x | !y" sparse
 warning

On Wed, Aug 26, 2020 at 03:34:26AM +0530, Anant Thazhemadam wrote:
> Upon running sparse, "warning: dubious: !x | !y" is brought to notice
> for this file. This patch fixes that warning.
> 
> If there's a specific reason that this change is considered undesirable, 
> please do let me know why.
> Thanks.

Please don't put this sort of comments in the commit message.  You can
put it under the --- cut off

> 
> Signed-off-by: Anant Thazhemadam <anant.thazhemadam@...il.com>
> ---
  ^^^
here.  Then it will be removed instead of going into the permanent git
log.

Please always say int the commit message how the patch will affect the
runtime behavior of the kernel.  In this case it will not affect it at
all.  It's just a clean up.  Her is my proposed commit message if you
want:

Subject: [PATCH] staging: media-atomisp : silence "dubious: !x | !y" warning

Upon running sparse, "warning: dubious: !x | !y" is brought to notice
for this file.  Logical and bitwise OR are basically the same in this
context so it doesn't cause a runtime bug.  But let's change it to
logical OR to make it cleaner and silence the Sparse warning.

regards,
dan carpenter

>  .../media/atomisp/pci/isp/kernels/vf/vf_1.0/ia_css_vf.host.c    | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/atomisp/pci/isp/kernels/vf/vf_1.0/ia_css_vf.host.c b/drivers/staging/media/atomisp/pci/isp/kernels/vf/vf_1.0/ia_css_vf.host.c
> index 358cb7d2cd4c..3b850bb2d39d 100644
> --- a/drivers/staging/media/atomisp/pci/isp/kernels/vf/vf_1.0/ia_css_vf.host.c
> +++ b/drivers/staging/media/atomisp/pci/isp/kernels/vf/vf_1.0/ia_css_vf.host.c
> @@ -58,7 +58,7 @@ sh_css_vf_downscale_log2(
>  	unsigned int ds_log2 = 0;
>  	unsigned int out_width;
>  
> -	if ((!out_info) | (!vf_info))
> +	if ((!out_info) || (!vf_info))
>  		return -EINVAL;
>  
>  	out_width = out_info->res.width;
> -- 
> 2.25.1
> 
> _______________________________________________
> devel mailing list
> devel@...uxdriverproject.org
> http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

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