tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: aab7ee9f8ff0110bfcd594b33dc33748dc1baf46 commit: 70d48975c152997bea1c715de3382ef854c288ed [8311/9127] mfd: core: Make a best effort attempt to match devices with the correct of_nodes config: microblaze-randconfig-r012-20200717 (attached as .config) compiler: microblaze-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 70d48975c152997bea1c715de3382ef854c288ed # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the linux-next/master HEAD aab7ee9f8ff0110bfcd594b33dc33748dc1baf46 builds fine. It may have been fixed somewhere. All errors (new ones prefixed by >>): drivers/mfd/kempld-core.c: In function 'kempld_register_cells_generic': 105 | devs[i++] = kempld_devs[KEMPLD_I2C]; | ^ drivers/mfd/kempld-core.c:108:13: error: assignment of read-only location 'devs[i++]' 108 | devs[i++] = kempld_devs[KEMPLD_WDT]; | ^ drivers/mfd/kempld-core.c:111:13: error: assignment of read-only location 'devs[i++]' 111 | devs[i++] = kempld_devs[KEMPLD_GPIO]; | ^ drivers/mfd/kempld-core.c:114:13: error: assignment of read-only location 'devs[i++]' 114 | devs[i++] = kempld_devs[KEMPLD_UART]; | ^ vim +105 drivers/mfd/kempld-core.c 43620a17945b598 Kevin Strasser 2013-06-23 98 43620a17945b598 Kevin Strasser 2013-06-23 99 static int kempld_register_cells_generic(struct kempld_device_data *pld) 43620a17945b598 Kevin Strasser 2013-06-23 100 { 43620a17945b598 Kevin Strasser 2013-06-23 101 struct mfd_cell devs[KEMPLD_MAX_DEVS]; 43620a17945b598 Kevin Strasser 2013-06-23 102 int i = 0; 43620a17945b598 Kevin Strasser 2013-06-23 103 43620a17945b598 Kevin Strasser 2013-06-23 104 if (pld->feature_mask & KEMPLD_FEATURE_BIT_I2C) 43620a17945b598 Kevin Strasser 2013-06-23 @105 devs[i++] = kempld_devs[KEMPLD_I2C]; 43620a17945b598 Kevin Strasser 2013-06-23 106 43620a17945b598 Kevin Strasser 2013-06-23 107 if (pld->feature_mask & KEMPLD_FEATURE_BIT_WATCHDOG) 43620a17945b598 Kevin Strasser 2013-06-23 108 devs[i++] = kempld_devs[KEMPLD_WDT]; 43620a17945b598 Kevin Strasser 2013-06-23 109 43620a17945b598 Kevin Strasser 2013-06-23 110 if (pld->feature_mask & KEMPLD_FEATURE_BIT_GPIO) 43620a17945b598 Kevin Strasser 2013-06-23 111 devs[i++] = kempld_devs[KEMPLD_GPIO]; 43620a17945b598 Kevin Strasser 2013-06-23 112 43620a17945b598 Kevin Strasser 2013-06-23 113 if (pld->feature_mask & KEMPLD_FEATURE_MASK_UART) 43620a17945b598 Kevin Strasser 2013-06-23 114 devs[i++] = kempld_devs[KEMPLD_UART]; 43620a17945b598 Kevin Strasser 2013-06-23 115 43620a17945b598 Kevin Strasser 2013-06-23 116 return mfd_add_devices(pld->dev, -1, devs, i, NULL, 0, NULL); 43620a17945b598 Kevin Strasser 2013-06-23 117 } 43620a17945b598 Kevin Strasser 2013-06-23 118 :::::: The code at line 105 was first introduced by commit :::::: 43620a17945b598e707ef897b3866914f9f9056c mfd: Kontron PLD mfd driver :::::: TO: Kevin Strasser <kevin.strasser(a)linux.intel.com&gt; :::::: CC: Samuel Ortiz <sameo(a)linux.intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org