netdev - Re: [kbuild-all] Re: [PATCH net-next 2/4] net: phy: dp83869: Set opmode from straps

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Date:   Wed, 20 May 2020 07:54:33 +0800
From:   Philip Li <philip.li@...el.com>
To:     Dan Murphy <dmurphy@...com>
Cc:     kbuild test robot <lkp@...el.com>, andrew@...n.ch,
        f.fainelli@...il.com, hkallweit1@...il.com, davem@...emloft.net,
        kbuild-all@...ts.01.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [kbuild-all] Re: [PATCH net-next 2/4] net: phy: dp83869: Set
 opmode from straps

On Tue, May 19, 2020 at 12:40:37PM -0500, Dan Murphy wrote:
> kbuild
> 
> On 5/19/20 12:19 PM, kbuild test robot wrote:
> > Hi Dan,
> > 
> > I love your patch! Perhaps something to improve:
> > 
> > [auto build test WARNING on net-next/master]
> > [also build test WARNING on robh/for-next sparc-next/master net/master linus/master v5.7-rc6 next-20200518]
> > [if your patch is applied to the wrong git tree, please drop us a note to help
> > improve the system. BTW, we also suggest to use '--base' option to specify the
> > base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
> > 
> > url:    https://github.com/0day-ci/linux/commits/Dan-Murphy/DP83869-Enhancements/20200519-222047
> > base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 5cdfe8306631b2224e3f81fc5a1e2721c7a1948b
> > config: sh-allmodconfig (attached as .config)
> > compiler: sh4-linux-gcc (GCC) 9.3.0
> > reproduce:
> >          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >          chmod +x ~/bin/make.cross
> >          # save the attached .config to linux build tree
> >          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sh
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kbuild test robot <lkp@...el.com>
> > 
> > All warnings (new ones prefixed by >>, old ones prefixed by <<):
> > 
> > drivers/net/phy/dp83869.c: In function 'dp83869_set_strapped_mode':
> > > > drivers/net/phy/dp83869.c:171:10: warning: comparison is always false due to limited range of data type [-Wtype-limits]
> > 171 |  if (val < 0)
> 
> This looks to be a false positive.
> 
> phy_read_mmd will return an errno or a value from 0->15
thanks, here because val is defined as "u16 val", the comparison
to < 0 can not work as expected. Any err returned from phy_read_mmd,
which is int, will be converted to u16.

> 
> So if errno is returned then this will be true.
> 
> Unless I have to do IS_ERR.
> 
> Dan
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