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

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Date:   Mon, 12 Apr 2021 12:17:10 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Greg KH <gregkh@...uxfoundation.org>
cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        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: [Outreachy kernel] Re: [PATCH 1/6] staging: media: intel-ipu3:
 replace bit shifts with BIT() macro



On Mon, 12 Apr 2021, Greg KH wrote:

> 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)

Mitali,

It's not very relevant given the use of this header, but if the 1 << 15
translation was correct, you could have changed the 1 << 12 computation as
well.

julia

> > > -#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
>
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