linux-kernel - Re: [PATCH 1/6] staging: media: intel-ipu3: replace bit shifts with BIT() macro

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Message-ID: <YHQXty07oAP1L0W9@kroah.com>
Date:   Mon, 12 Apr 2021 11:49:43 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Mitali Borkar <mitaliborkar810@...il.com>, bingbu.cao@...el.com,
        tian.shu.qiu@...el.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com,
        mitali_s@...iitr.ac.in
Subject: Re: [PATCH 1/6] staging: media: intel-ipu3: replace bit shifts with
 BIT() macro

On Mon, Apr 12, 2021 at 12:42:30PM +0300, Sakari Ailus wrote:
> Hi Mitali,
> 
> On Mon, Apr 12, 2021 at 04:38:39AM +0530, Mitali Borkar wrote:
> > Added #include <linux/bitops.h> and replaced bit shifts by BIT() macro.
> > This BIT() macro from linux/bitops.h is used to define IPU3_UAPI_GRID_Y_START_EN
> > and IPU3_UAPI_AWB_RGBS_THR_B_* bitmask.
> > Use of macro is better and neater. It maintains consistency.
> > Reported by checkpatch.
> > 
> > Signed-off-by: Mitali Borkar <mitaliborkar810@...il.com>
> > ---
> >  drivers/staging/media/ipu3/include/intel-ipu3.h | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/staging/media/ipu3/include/intel-ipu3.h b/drivers/staging/media/ipu3/include/intel-ipu3.h
> > index edd8edda0647..589d5ccee3a7 100644
> > --- a/drivers/staging/media/ipu3/include/intel-ipu3.h
> > +++ b/drivers/staging/media/ipu3/include/intel-ipu3.h
> > @@ -5,6 +5,7 @@
> >  #define __IPU3_UAPI_H
> >  
> >  #include <linux/types.h>
> > +#include <linux/bitops.h>
> >  
> >  /* from /drivers/staging/media/ipu3/include/videodev2.h */
> >  
> > @@ -22,11 +23,11 @@
> >  #define IPU3_UAPI_MAX_BUBBLE_SIZE			10
> >  
> >  #define IPU3_UAPI_GRID_START_MASK			((1 << 12) - 1)
> > -#define IPU3_UAPI_GRID_Y_START_EN			(1 << 15)
> > +#define IPU3_UAPI_GRID_Y_START_EN			BIT(15)
> 
> This header is used in user space where you don't have the BIT() macro.

If that is true, why is it not in a "uapi" subdir within this driver?

Otherwise it is not obvious at all that this is the case :(

thanks,

greg k-h