Subject: Re: [PATCH net-next v2 08/22] net: stmmac: rk: convert rk3588 to mask-based interface mode config

From: kernel test robot <[email-masked]>
Date: Tue, 27 Jan 2026 06:19:21 +0800

Hi Russell,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Russell-King-Oracle/net-stmmac-rk-avoid-phy_power_on/20260126-234820
base:   net-next/main
patch link:    https://lore.kernel.org/r/E1vkL2I-00000005usu-42Hy%40rmk-PC.armlinux.org.uk
patch subject: [PATCH net-next v2 08/22] net: stmmac: rk: convert rk3588 to mask-based interface mode config
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20260127/[email-masked]/config)
compiler: m68k-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260127/[email-masked]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email-masked]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

All warnings (new ones prefixed by >>):

   drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c: In function 'rk_write_gmac_grf_reg':
>> drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c:132:24: warning: variable 'regmap' set but not used [-Wunused-but-set-variable]
     132 |         struct regmap *regmap;
         |                        ^~~~~~

vim +/regmap +132 drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c

   129	
   130	static int rk_write_gmac_grf_reg(struct rk_priv_data *bsp_priv, u32 val)
   131	{
 > 132		struct regmap *regmap;
   133	
   134		if (bsp_priv->ops->gmac_grf_reg_in_php)
   135			regmap = bsp_priv->php_grf;
   136		else
   137			regmap = bsp_priv->grf;
   138	
   139		return regmap_write(bsp_priv->grf, bsp_priv->gmac_grf_reg, val);
   140	}
   141	

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