Re: [PATCH] i2c: i2c-stub: support for I2C_FUNC_I2C

[kernel test robot <lkp@intel.com>]

Hi Peter,

kernel test robot noticed the following build errors:

[auto build test ERROR on wsa/i2c/for-next]
[also build test ERROR on linus/master v6.16-rc1 next-20260508]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Peter-Bohner/i2c-i2c-stub-support-for-I2C_FUNC_I2C/20260515-113705
base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next
patch link:    https://lore.kernel.org/r/20260514081100.381043-1-peter%40bohner.me
patch subject: [PATCH] i2c: i2c-stub: support for I2C_FUNC_I2C
config: x86_64-rhel-9.4 (https://download.01.org/0day-ci/archive/20260515/202605151418.JKwPcs0v-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260515/202605151418.JKwPcs0v-lkp@intel.com/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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202605151418.JKwPcs0v-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/i2c/i2c-stub.c: In function 'stub_xfer':
>> drivers/i2c/i2c-stub.c:157:33: error: implicit declaration of function 'krelloc_array'; did you mean 'krealloc_array'? [-Wimplicit-function-declaration]
     157 |                                 krelloc_array(chip->i2c_rw_data, msg->len, 1,
         |                                 ^~~~~~~~~~~~~
         |                                 krealloc_array
>> drivers/i2c/i2c-stub.c:156:36: error: assignment to 'u8 *' {aka 'unsigned char *'} from 'int' makes pointer from integer without a cast [-Wint-conversion]
     156 |                         new_rw_mem =
         |                                    ^


vim +157 drivers/i2c/i2c-stub.c

   140	
   141	static s32 stub_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
   142	{
   143		int i;
   144		u8 *new_rw_mem;
   145		struct stub_chip *chip = NULL;
   146		struct i2c_msg *msg;
   147	
   148		for (i = 0; i < num; i++) {
   149			msg = msgs + i;
   150			chip = stub_addr_to_chip(msg->addr);
   151			if (!chip)
   152				return -ENODEV;
   153	
   154			/* len is guaranteed to be <= 8192 by i2cdev_ioctl_rdwr */
   155			if (chip->i2c_rw_size < msg->len) {
 > 156				new_rw_mem =
 > 157					krelloc_array(chip->i2c_rw_data, msg->len, 1,
   158						      GFP_KERNEL | __GFP_ZERO);
   159				if (!new_rw_mem)
   160					return -ENOMEM;
   161				chip->i2c_rw_data = new_rw_mem;
   162				chip->i2c_rw_size = msg->len;
   163			}
   164	
   165			/* read, size determined by slave */
   166			if ((msg->flags & I2C_M_RD) && (msg->flags & I2C_M_RECV_LEN)) {
   167				/* i2cdev_ioctl_rdwr expects this as a maximum, even
   168				 * though 0xff would be the theoretically possible
   169				 */
   170				msg->len = min(chip->i2c_rw_size, I2C_SMBUS_BLOCK_MAX);
   171				msg->buf[0] = msg->len - 1;
   172				dev_dbg(&adap->dev,
   173					"i2c read with RECV_LEN - addr 0x%02x, read %u bytes\n",
   174					msg->addr, msg->len);
   175				memcpy(msg->buf + 1, chip->i2c_rw_data, msg->len - 1);
   176			} else if (msg->flags & I2C_M_RD) {
   177				dev_dbg(&adap->dev,
   178					"i2c read - addr 0x%02x, read %u bytes\n",
   179					msg->addr, msg->len);
   180				memcpy(msg->buf, chip->i2c_rw_data, msg->len);
   181			} else {
   182				dev_dbg(&adap->dev,
   183					"i2c write - addr 0x%02x, wrote %u bytes\n",
   184					msg->addr, msg->len);
   185				memcpy(chip->i2c_rw_data, msg->buf, msg->len);
   186			}
   187		}
   188		return num;
   189	}
   190	

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