[gpio:devel 8/12] drivers/gpio/gpio-mvebu.c:1062: undefined reference to `__devm_regmap_init_mmio_clk'

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git devel
head:   240d3d5b2a7a32630f1fadd6b145d48978882824
commit: 2233bf7a92e784f20d1a4a1d39438dcf51e75161 [8/12] gpio: mvebu: switch to regmap for register access
config: arm-mv78xx0_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 2233bf7a92e784f20d1a4a1d39438dcf51e75161
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `mvebu_gpio_probe':
>> drivers/gpio/gpio-mvebu.c:1062: undefined reference to `__devm_regmap_init_mmio_clk'
   drivers/gpio/gpio-mvebu.c:1078: undefined reference to `__devm_regmap_init_mmio_clk'

vim +1062 drivers/gpio/gpio-mvebu.c

  1056	
  1057		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  1058		base = devm_ioremap_resource(&pdev->dev, res);
  1059		if (IS_ERR(base))
  1060			return PTR_ERR(base);
  1061	
> 1062		mvchip->regs = devm_regmap_init_mmio(&pdev->dev, base,
  1063						     &mvebu_gpio_regmap_config);
  1064		if (IS_ERR(mvchip->regs))
  1065			return PTR_ERR(mvchip->regs);

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