[axboe-block:rw_iter 8/105] drivers/char/apm-emulation.c:207:24: error: implicit declaration of function 'iov_iter_count'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git rw_iter
head:   941c541566a6784beff5ef54ed880c606e3a6225
commit: c2c25f7dd4b3215699ae7d42d9c48bb73b0e62a2 [8/105] char: convert drivers to use ->read_iter() and ->write_iter()
config: arm-randconfig-r123-20240406 (https://download.01.org/0day-ci/archive/20240406/202404062219.pb096Kaf-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20240406/202404062219.pb096Kaf-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/202404062219.pb096Kaf-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/char/apm-emulation.c: In function 'apm_read':
>> drivers/char/apm-emulation.c:207:24: error: implicit declaration of function 'iov_iter_count' [-Werror=implicit-function-declaration]
     207 |         size_t count = iov_iter_count(to);
         |                        ^~~~~~~~~~~~~~
>> drivers/char/apm-emulation.c:223:22: error: implicit declaration of function 'copy_to_iter_full' [-Werror=implicit-function-declaration]
     223 |                 if (!copy_to_iter_full(&event, sizeof(event), to))
         |                      ^~~~~~~~~~~~~~~~~
   drivers/char/apm-emulation.c: At top level:
   drivers/char/apm-emulation.c:144:19: warning: 'driver_version' defined but not used [-Wunused-const-variable=]
     144 | static const char driver_version[] = "1.13";    /* no spaces */
         |                   ^~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/iov_iter_count +207 drivers/char/apm-emulation.c

   202	
   203	static ssize_t apm_read(struct kiocb *iocb, struct iov_iter *to)
   204	{
   205		struct file *fp = iocb->ki_filp;
   206		struct apm_user *as = fp->private_data;
 > 207		size_t count = iov_iter_count(to);
   208		apm_event_t event;
   209		int i = count, ret = 0;
   210	
   211		if (count < sizeof(apm_event_t))
   212			return -EINVAL;
   213	
   214		if (queue_empty(&as->queue) && fp->f_flags & O_NONBLOCK)
   215			return -EAGAIN;
   216	
   217		wait_event_interruptible(apm_waitqueue, !queue_empty(&as->queue));
   218	
   219		while ((i >= sizeof(event)) && !queue_empty(&as->queue)) {
   220			event = queue_get_event(&as->queue);
   221	
   222			ret = -EFAULT;
 > 223			if (!copy_to_iter_full(&event, sizeof(event), to))
   224				break;
   225	
   226			mutex_lock(&state_lock);
   227			if (as->suspend_state == SUSPEND_PENDING &&
   228			    (event == APM_SYS_SUSPEND || event == APM_USER_SUSPEND))
   229				as->suspend_state = SUSPEND_READ;
   230			mutex_unlock(&state_lock);
   231	
   232			i -= sizeof(event);
   233		}
   234	
   235		if (i < count)
   236			ret = count - i;
   237	
   238		return ret;
   239	}
   240	

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