arch/mips/pmcs-msp71xx/msp_prom.c:64:34: error: 'MAX_PROM_MEM' undeclared here (not in a function); did you mean 'DEV_PROP_MAX'?

[kbuild test robot]

tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f41def397161053eb0d3ed6861ef65985efbf293
commit: b3c948e2c00f561b22a9865a9b9b952072973285 MIPS: msp: Record prom memory
date:   5 weeks ago
config: mips-msp71xx_defconfig (attached as .config)
compiler: mips-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout b3c948e2c00f561b22a9865a9b9b952072973285
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=mips 

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

All errors (new ones prefixed by >>):

>> arch/mips/pmcs-msp71xx/msp_prom.c:64:34: error: 'MAX_PROM_MEM' undeclared here (not in a function); did you mean 'DEV_PROP_MAX'?
    static phys_addr_t prom_mem_base[MAX_PROM_MEM] __initdata;
                                     ^~~~~~~~~~~~
                                     DEV_PROP_MAX
   arch/mips/pmcs-msp71xx/msp_prom.c: In function 'prom_free_prom_memory':
>> arch/mips/pmcs-msp71xx/msp_prom.c:380:16: error: unused variable 'addr' [-Werror=unused-variable]
     unsigned long addr;
                   ^~~~
   At top level:
>> arch/mips/pmcs-msp71xx/msp_prom.c:65:20: error: 'prom_mem_size' defined but not used [-Werror=unused-variable]
    static phys_addr_t prom_mem_size[MAX_PROM_MEM] __initdata;
                       ^~~~~~~~~~~~~
>> arch/mips/pmcs-msp71xx/msp_prom.c:64:20: error: 'prom_mem_base' defined but not used [-Werror=unused-variable]
    static phys_addr_t prom_mem_base[MAX_PROM_MEM] __initdata;
                       ^~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +64 arch/mips/pmcs-msp71xx/msp_prom.c

    63	
  > 64	static phys_addr_t prom_mem_base[MAX_PROM_MEM] __initdata;
  > 65	static phys_addr_t prom_mem_size[MAX_PROM_MEM] __initdata;
    66	static unsigned int nr_prom_mem __initdata;
    67	

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