Re: [PATCH] mmc: dw_mmc: Add data CRC error injection

[kernel test robot]

Hi Vincent,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.13 next-20210630]
[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]

url:    https://github.com/0day-ci/linux/commits/Vincent-Whitchurch/mmc-dw_mmc-Add-data-CRC-error-injection/20210630-182344
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 007b350a58754a93ca9fe50c498cc27780171153
config: arm-buildonly-randconfig-r005-20210630 (attached as .config)
compiler: arm-linux-gnueabi-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
        # https://github.com/0day-ci/linux/commit/c77ecd0f5373a88c7f00191136827f5bc42f3948
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Vincent-Whitchurch/mmc-dw_mmc-Add-data-CRC-error-injection/20210630-182344
        git checkout c77ecd0f5373a88c7f00191136827f5bc42f3948
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   drivers/mmc/host/dw_mmc.c: In function 'dw_mci_start_fault_timer':
>> drivers/mmc/host/dw_mmc.c:1826:21: error: implicit declaration of function 'prandom_u32' [-Werror=implicit-function-declaration]
    1826 |         ms_to_ktime(prandom_u32() % 25),
         |                     ^~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/prandom_u32 +1826 drivers/mmc/host/dw_mmc.c

  1811	
  1812	static void dw_mci_start_fault_timer(struct dw_mci *host)
  1813	{
  1814		struct mmc_data *data = host->data;
  1815	
  1816		if (!data || data->blocks <= 1)
  1817			return;
  1818	
  1819		if (!should_fail(&host->fail_data_crc, 1))
  1820			return;
  1821	
  1822		/*
  1823		 * Try to inject the error at random points during the data transfer.
  1824		 */
  1825		hrtimer_start(&host->fault_timer,
> 1826			      ms_to_ktime(prandom_u32() % 25),
  1827			      HRTIMER_MODE_REL);
  1828	}
  1829	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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