linux-kernel - Re: [Outreachy kernel] [PATCH 2/2] media: zoran: replace bit shifts by BIT() macro

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Date:   Fri, 9 Apr 2021 03:15:59 +0530
From:   Mitali Borkar <mitaliborkar810@...il.com>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     clabbe@...libre.com, mchehab@...nel.org,
        gregkh@...uxfoundation.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com,
        mitali_s@...iitr.ac.in
Subject: Re: [Outreachy kernel] [PATCH 2/2] media: zoran: replace bit shifts
 by BIT() macro

On Thu, Apr 08, 2021 at 11:15:07PM +0200, Julia Lawall wrote:
> 
> 
> On Fri, 9 Apr 2021, 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 ZR36057_VFESPFR_* bitmasks.
> > Use of macro is better and neater. It maintains consistency.
> > Reported by checkpatch.
> >
> > Signed-off-by: Mitali Borkar <mitaliborkar810@...il.com>
> > ---
> >  drivers/staging/media/zoran/zr36057.h | 10 ++++++----
> >  1 file changed, 6 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/staging/media/zoran/zr36057.h b/drivers/staging/media/zoran/zr36057.h
> > index a2a75fd9f535..93075459f910 100644
> > --- a/drivers/staging/media/zoran/zr36057.h
> > +++ b/drivers/staging/media/zoran/zr36057.h
> > @@ -8,6 +8,8 @@
> >  #ifndef _ZR36057_H_
> >  #define _ZR36057_H_
> >
> > +#include <linux/bitops.h>
> > +
> >  /* Zoran ZR36057 registers */
> >
> >  #define ZR36057_VFEHCR          0x000	/* Video Front End, Horizontal Configuration Register */
> > @@ -31,12 +33,12 @@
> >  #define ZR36057_VFESPFR_VER_DCM          8
> >  #define ZR36057_VFESPFR_DISP_MODE        6
> >  #define ZR36057_VFESPFR_YUV422          (0 << 3)
> > -#define ZR36057_VFESPFR_RGB888          (1 << 3)
> > +#define ZR36057_VFESPFR_RGB888          BIT(3)
> 
> Uniformity is generally considered to be more important than using BIT.
> Having only a few constants defined using BIT is a bit strange.
>
Okay Ma'am. Can you please tell me on how to proceed now? I am not sure
how to proceed.

> julia
> 
> >  #define ZR36057_VFESPFR_RGB565          (2 << 3)
> >  #define ZR36057_VFESPFR_RGB555          (3 << 3)
> > -#define ZR36057_VFESPFR_ERR_DIF          (1 << 2)
> > -#define ZR36057_VFESPFR_PACK24          (1 << 1)
> > -#define ZR36057_VFESPFR_LITTLE_ENDIAN    (1 << 0)
> > +#define ZR36057_VFESPFR_ERR_DIF          BIT(2)
> > +#define ZR36057_VFESPFR_PACK24          BIT(1)
> > +#define ZR36057_VFESPFR_LITTLE_ENDIAN    BIT(0)
> >
> >  #define ZR36057_VDTR            0x00c	/* Video Display "Top" Register */
> >
> > --
> > 2.30.2
> >
> > --
> > You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@...glegroups.com.
> > To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/ac8ec2b70ac2cc7c541c05a1d9a8db1fe79df793.1617912177.git.mitaliborkar810%40gmail.com.
> >