[krzk-github:b4/firmare-acpm-counted 3/4] drivers/firmware/samsung/exynos-acpm-dvfs.c:53:33: error: call to undeclared function 'ARRAY_SIZE'; ISO C99 and later do not support implicit function declarations

[krzk-github:b4/firmare-acpm-counted 3/4] drivers/firmware/samsung/exynos-acpm-dvfs.c:53:33: error: call to undeclared function 'ARRAY_SIZE'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

tree:   https://github.com/krzk/linux b4/firmare-acpm-counted
head:   c446778ac8dbd96a1ec1a82ad39abdabb80594bf
commit: a185cddcfe370dc12ac5ddeafebeb7a57bd42563 [3/4] firmware: exynos-acpm: Count number of commands in acpm_xfer
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20260215/202602150151.N56eN2Xi-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260215/202602150151.N56eN2Xi-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/202602150151.N56eN2Xi-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/firmware/samsung/exynos-acpm-dvfs.c:53:33: error: call to undeclared function 'ARRAY_SIZE'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      53 |         acpm_dvfs_set_xfer(&xfer, cmd, ARRAY_SIZE(cmd), acpm_chan_id, false);
         |                                        ^
   drivers/firmware/samsung/exynos-acpm-dvfs.c:73:33: error: call to undeclared function 'ARRAY_SIZE'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      73 |         acpm_dvfs_set_xfer(&xfer, cmd, ARRAY_SIZE(cmd), acpm_chan_id, true);
         |                                        ^
   2 errors generated.


vim +/ARRAY_SIZE +53 drivers/firmware/samsung/exynos-acpm-dvfs.c

    44	
    45	int acpm_dvfs_set_rate(const struct acpm_handle *handle,
    46			       unsigned int acpm_chan_id, unsigned int clk_id,
    47			       unsigned long rate)
    48	{
    49		struct acpm_xfer xfer = {0};
    50		u32 cmd[4];
    51	
    52		acpm_dvfs_init_set_rate_cmd(cmd, clk_id, rate);
  > 53		acpm_dvfs_set_xfer(&xfer, cmd, ARRAY_SIZE(cmd), acpm_chan_id, false);
    54	
    55		return acpm_do_xfer(handle, &xfer);
    56	}
    57	

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