linux-kernel - Re: [PATCH v1] reset: intel: fix a compile warning about REG

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Date:   Fri, 26 Jun 2020 20:33:51 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     broonie@...nel.org, linux-kernel@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v1] reset: intel: fix a compile warning about REG_OFFSET
 redefined

On Fri, Jun 26, 2020 at 12:38:13PM +0200, Philipp Zabel wrote:
Hi Philipp:

Thanks very much for your review!

> Hi Dejin,
> 
> On Thu, 2020-06-04 at 23:30 +0800, Dejin Zheng wrote:
> > kernel test robot reports a compile warning about REG_OFFSET redefined
> > in the reset-intel-gw.c after merging commit e44ab4e14d6f4 ("regmap:
> > Simplify implementation of the regmap_read_poll_timeout() macro"). the
> > warning is like that:
> > 
> > drivers/reset/reset-intel-gw.c:18:0: warning: "REG_OFFSET" redefined
> >  #define REG_OFFSET GENMASK(31, 16)
> > 
> > In file included from ./arch/arm/mach-ixp4xx/include/mach/hardware.h:30:0,
> >                  from ./arch/arm/mach-ixp4xx/include/mach/io.h:15,
> >                  from ./arch/arm/include/asm/io.h:198,
> >                  from ./include/linux/io.h:13,
> >                  from ./include/linux/iopoll.h:14,
> >                  from ./include/linux/regmap.h:20,
> >                  from drivers/reset/reset-intel-gw.c:12:
> > ./arch/arm/mach-ixp4xx/include/mach/platform.h:25:0: note: this is the location of the previous definition
> >  #define REG_OFFSET 3
> > 
> > Reported-by: kernel test robot <lkp@...el.com>
> > Fixes: e44ab4e14d6f4 ("regmap: Simplify implementation of the regmap_read_poll_timeout() macro")
> 
> Hm, shouldn't this rather be:
> 
> Fixes: c9aef213e38c ("reset: intel: Add system reset controller driver")
> 
> even though e44ab4e14d6f4 triggered the issue by including iopoll.h?
>
Ok.

> > Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
> > ---
> >  drivers/reset/reset-intel-gw.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/reset/reset-intel-gw.c b/drivers/reset/reset-intel-gw.c
> > index 854238444616..5cfb4892b399 100644
> > --- a/drivers/reset/reset-intel-gw.c
> > +++ b/drivers/reset/reset-intel-gw.c
> > @@ -15,7 +15,7 @@
> >  #define RCU_RST_STAT	0x0024
> >  #define RCU_RST_REQ	0x0048
> >  
> > -#define REG_OFFSET	GENMASK(31, 16)
> > +#define REG_OFFSET_MASK	GENMASK(31, 16)
> >  #define BIT_OFFSET	GENMASK(15, 8)
> >  #define STAT_BIT_OFFSET	GENMASK(7, 0)
> 
> Could you add the _MASK suffix to BIT_OFFSET and STAT_BIT_OFFSET as
> well, for consistency?
>
I will add it in next patch version. Thanks!

BR,
Dejin

> regards
> Philipp