[PATCH v13 6/6] powerpc: add crash memory hotplug support

[kernel test robot]

Hi Sourabh,

kernel test robot noticed the following build errors:

[auto build test ERROR on powerpc/next]
[also build test ERROR on powerpc/fixes tip/x86/core akpm-mm/mm-everything linus/master v6.7-rc4 next-20231205]
[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/Sourabh-Jain/crash-make-CPU-and-Memory-hotplug-support-reporting-flexible/20231204-143305
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
patch link:    https://lore.kernel.org/r/20231204053253.25305-7-sourabhjain%40linux.ibm.com
patch subject: [PATCH v13 6/6] powerpc: add crash memory hotplug support
config: powerpc64-randconfig-001-20231205 (https://download.01.org/0day-ci/archive/20231206/202312060059.JITEJl8B-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231206/202312060059.JITEJl8B-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312060059.JITEJl8B-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/powerpc/kexec/core_64.c: In function 'arch_crash_get_elfcorehdr_size':
>> arch/powerpc/kexec/core_64.c:595:33: error: implicit declaration of function 'memory_hotplug_max' [-Werror=implicit-function-declaration]
     595 |                 elf_phdr_cnt += memory_hotplug_max() / (2 * drmem_lmb_size());
         |                                 ^~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/memory_hotplug_max +595 arch/powerpc/kexec/core_64.c

   579	
   580	/*
   581	 * Advertise preferred elfcorehdr size to userspace via
   582	 * /sys/kernel/crash_elfcorehdr_size sysfs interface.
   583	 */
   584	unsigned int arch_crash_get_elfcorehdr_size(void)
   585	{
   586		unsigned int sz;
   587		unsigned long elf_phdr_cnt;
   588	
   589		/* Program header for CPU notes and vmcoreinfo */
   590		elf_phdr_cnt = 2;
   591		if (IS_ENABLED(CONFIG_MEMORY_HOTPLUG))
   592			/* In the worst case, a Phdr is needed for every other LMB to be
   593			 * represented as an individual crash range.
   594			 */
 > 595			elf_phdr_cnt += memory_hotplug_max() / (2 * drmem_lmb_size());
   596	
   597		/* Do not cross the max limit */
   598		if (elf_phdr_cnt > PN_XNUM)
   599			elf_phdr_cnt = PN_XNUM;
   600	
   601		sz = sizeof(struct elfhdr) + (elf_phdr_cnt * sizeof(Elf64_Phdr));
   602		return sz;
   603	}
   604	

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